ICS Regent+Plus - Rockwell Automation...A block diagram of the analog input module is shown in Figure 1. Figure 1. Block Diagram of Analog Input Module. Analog field signals are conditioned

ICS Regent+Plus® PD-7023

Industrial Control Services 1

Analog Input Modules

60 Hz Rejection and Fast Response (T7420A and T7420AF)

Issue 1, March, 06

Analog input modules provide data input for a maximum of 16 field analog signals per module. Two types of modules are available: one for high noise immunity (60 Hz rejection) and one with low noise immunity (fast response).

Features

· Sixteen single-ended or eight differential voltage inputs. Interface to current inputs using external 250 ohm resistors for current to voltage conversion (resistors are provided as part of the I/O Termination Assembly - see PD-7901).

· Fault tolerant operation when connected in parallel with redundant modules of the same type.

· Hot replaceable.

· Jumper-selectable input ranges.

· 12-bit analog to digital resolution (1 part in 4096).

· Sample rate of all channels in 1.8 msec (differential) or 3.6 msec (single-ended).

· 60 Hz rejection (T7420A) and fast response (T7420AF) versions available.

· 2500 volt isolation between analog and digital logic circuits.

· Individual front panel indicators on each module show module active and fault status.

· TÜV certified for safety, Risk Class 5.

Each module’s triplicated I/O Safetybus interface ensures that no failure in the module can affect the operation of the Regent system or other I/O modules in the system. Extensive fault detection and annunciation of critical redundant circuits help

Analog Input Modules (T7420A, AF)

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prevent the controllers from receiving erroneous data from a faulty input module.

Three analog input modules can be connected in parallel to obtain fault tolerant input sensing. In this triple module configuration, a failed module can be removed and replaced without interrupting the input signals.

Module Operation

A block diagram of the analog input module is shown in Figure 1.

Figure 1. Block Diagram of Analog Input Module.

Analog field signals are conditioned and multiplexed into an analog-to-digital (A to D) converter and converted into 12-bit digital data. These digital values are stored in the module’s RAM. The digital logic circuits are optically isolated from the analog field signals to protect the logic circuits from external field signal transients and over voltages.


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The processor modules send triplicated read data requests to the analog input module over the I/O Safetybus. The processors’ addressing data and data read requests are voted by the module (preventing I/O Safetybus failures upstream from the module from affecting module operations). The voted result is then passed to the I/O bus interface logic.

After receiving the voted data read request, the I/O bus interface logic retrieves the analog data values from the RAM and places the data into the module’s three bus drivers. Each of the three bus drivers is independently powered and controlled (by the I/O transceiver modules) — preventing failures in a single driver from propagating to the other two /O busses. The bus drivers then transmit the data via the backplane I/O Safetybus to the I/O transceiver modules which, in turn, transmit the data to the processors.

The 12-bit analog input data is packaged as a 16-bit integer. In this format the analog data is the least significant bits, providing analog input data ranging from 0 to 4095. Two of the remaining four bits are used to flag alarms as shown in Figure 2.

Figure 2. Analog Input Data Format.

Testing and Diagnostics

Each module’s voter circuits are periodically tested by the processor modules. Discrepant data are sent through one of three legs of the I/O Safetybus to determine whether the module’s voter is able to outvote the incorrect data. A failure to return the correct majority-voted result to the processors



produces an I/O module error indication at the processor modules and a module fault indication at the I/O module.

Each type of module has a unique identification code that is read by the controller. This code lets the controller know which type of module is installed in each I/O chassis slot and how to address that module and its points specifically. If a module is removed, or is replaced with a module of a different type, the processor modules will indicate an I/O module error.

Loopback logic tests periodically write data to the module and then read it back to determine whether the module’s I/O bus interface logic is functioning correctly.

Front Panel Indicators

Figure 3 shows the physical features of the analog input modules. The front panel of each module contains active and fault status indicators.

Active and Fault Status Indicators

These green and red LEDs indicate the overall health of the module. During normal operation the green ACTIVE indicator flashes at the controller's scan rate. If a module fault occurs the red FAULT indicator turns on and the green ACTIVE indicator turns off.


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Figure 3. Analog Input Module.



Application

Analog Input Range Selection

The possible input voltage ranges are the same for both differential and single-ended modes. Since current measurements are converted to voltages using external precision resistors, the same voltage ranges apply. Choices of input voltage ranges include unipolar, bipolar, and offset ranges. All ranges are selected by setting jumpers located inside the module.

Table 1. Analog Input Ranges.

Voltage Ranges Current Ranges

(using external 250 Ohm resistor)

0 to 5 Vdc 0 to 20 mA


-5 to +5 Vdc -20 to +20 mA


-10 to +10 Vdc -40 to +40 mA

Input Out of Range Detection

If the analog signal is well beyond the normal operating range selected, the NOSIG contact associated with the analog point will be enabled. Note that there are some out-of-range signals that do not set the NOSIG bit. The out of range thresholds for each input range are shown on page 27.

Absolute Signal Ranges

The absolute working range for any analog input signals is from -10.3 volts to +10.3 volts with regard to AGND (analog ground). The acceptable common mode voltage range (either differential or single-ended with regard to its appropriate analog reference input) is from -10.3 volts to +10.3 volts.


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Sampling Speed

The rate at which each of the analog input channels is sampled depends upon the mode of operation. Each channel is given a 225 msec time slot during the multiplexing process. During that time slot, the input voltage is connected to the measuring system, the measuring system is allowed to settle, the settled value is sampled (and held), and is then converted to a 12-bit value by an analog-to-digital converter. The channels are sampled in numerical order. In single-ended mode, the 16 channels are sampled in 3.60 msec on a continuous repeating basis. In differential mode, the eight channel pairs are sampled in 1.80 msec on a continuous repeating basis. Converted data are stored in the module’s RAM and can be accessed by the controller. Data for a given channel is available at the previously stored value until an updated conversion replaces it.

Sampling speed is unrelated to internal access speed within the Regent system. Programming and other features determine how often the Regent system can access the converted data. There are no “lockout times” when the Regent system is prevented from reading the current stored values of the converted data.

Single-Ended References

When single-ended input mode is selected, the ground reference for all eight signals on the same input field wiring terminal block is AREF1 on the top terminal block and AREF2 on the bottom. This ground reference may be different from the external I/O analog ground AGND also available on the same connector. When used with the I/O Termination Assembly (see PD-7901), both AREF1 and AREF2 are isolated from AGND by 1K Ohm resistors.

When the single-ended signals are measured, the appropriate ground reference for the signal is selected by another multiplexer on the board, and becomes the reference for the measurement. In differential mode, AREF1 and AREF2 are not used as references.



Input Over Voltage Protection

All analog inputs, regardless of mode and analog references (AREF1 and AREF2), are protected from over-voltages (these ranges are shown on page 27).

Current Measurement Considerations

Precision resistors external to the module are required to convert currents to voltages that can be measured directly by the module. The resistors can be mounted on field marshaling terminals or are provided using the appropriate analog input termination blocks. For differential current measurements, both sides of the external resistor are brought onto the module.

It is possible to mix current and voltage measurements on the same module as long as they can work with the same voltage range selected. In the case of single-ended measurements, this either requires that both current and voltage measurements are referenced to the same reference point (AREF1 or AREF2), or that voltage inputs be on one set of eight inputs and current inputs on the other set.

Input Range and Mode Selection Jumpers

The jumpers that determine the mode and input range for the module are set at manufacturing time for an input range of 1 to 5 volts and the 16-channel, single-ended input mode. If other input ranges or another mode is desired these jumpers must be repositioned to the appropriate settings.

There are 17 jumper locations that are used. They are summarized in Tables 2 and 3, below. The module’s cover must be removed to access and reposition the jumpers.


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Table 2. Mode Selection.

Jumper Single-Ended Differential

J251 n

J252 n

J501 n

J502 n

J503 n

J504 n

J505 n

J701 n

Table 3. Input Range Selection.

Jumper 0 to +10 -10 to +10 +1 to +5 0 to +5 -5 to +5

J551 n

J552 n n

J553 n n

J601 n n n

J602 n n

J651 n n

J652 n n n

J653 n n n

J654 n n

Input Low-Pass Filters

Two rows of jumper connections (J506 and J507) allow selection of onboard capacitors to create single-pole low-pass input filters on the board. Jumpers are placed on these connections to select either single-ended or differential filters as appropriate.

In single-ended mode, the filtering is done with respect to the appropriate AREF1 (or AREF2) input line. A 10K Ohm resistor is in series with each analog input line (this resistor is also a part of the over voltage protection system for the module as well), and the capacitor is on the multiplexing side of the resistor. There are four rows of eight pins labeled J506 and J507, for single-ended mode filtering install jumpers across row J506 and row J507 (for a total of 16 jumpers).


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In differential mode, a 10K Ohm resistor is in series with each input line of each input analog channel pair. The capacitors are placed on the multiplexing side of the resistors. The filtering is then differential. There are four rows of eight pins labeled J506 and J507, for differential mode filtering install jumpers between rows J506 and J507 (for a total of eight jumpers).

Frequency response data for the T7420A and T7420AF is provided on page 27.


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Figure 4. Analog Input Configuration Jumper Locations.



Simplex Configuration

Analog input modules provide a suitable interface to non-critical input signals. Although many of the circuits in the analog input modules are automatically tested and annunciated, some logic circuits and all of the field-side sensing circuits are simplex and non-tested. This simplex input configuration is illustrated in Figure 5.

Figure 5. Simplex Analog Input Configuration.

Fault Tolerant Configurations

For critical inputs, redundant input modules are used in a 2oo3 or 1oo2 fault tolerant configuration. In these configurations the redundant input modules are connected to single or multiple sensors. If redundant sensors are installed in the field, the redundant modules are connected so that each sensor connects to one of the redundant modules. These configurations are illustrated in Figure 6, showing triple redundant input modules. Each analog input module is hot replaceable. In redundant input configurations, if a fault occurs on one module, it can be removed and replaced while the system continues to sense the inputs from the remaining two input modules.


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Figure 6. Fault Tolerant Analog Input Configurations.

Field Wiring

For field wiring details, refer to PD-7901 - I/O Termination Assembly.



Keying

The I/O chassis can be physically keyed to prevent accidental damage caused by inserting a module into a slot wired for a different module type. Figure 7 illustrates how the slot keys are installed on the I/O chassis slot field wiring connectors. The slot key positions for the analog input modules are listed in Table 4.

Figure 7. Installing Slot Keys.


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Table 4. Slot Key Positions.

Module Upper Connector

Lower Connector

T7420A 9 15

T7420AF 9 15

Configuration

Each input module is configured using the WINTERPRET I/O Configuration Editor. In the editor, you will perform the three steps described below to configure the input module.

1) Set the Module Type:

Position the cursor on the module slot you wish to define. Choose Set Module Type from the Edit Menu and select the appropriate analog input module from the list.

There are four different analog input module types listed in the Set Module Type dialog. Be sure to select the appropriate module, i.e. standard response (T7420A) vs. fast response (T7420AF) and single-ended (16-channel) vs. differential (8-channel).

2) Edit the Module Definition:

Choose Edit Module Definition from the Edit Menu. A dialog box will open where you can define the input point definitions. Single-ended analog input modules will show sixteen points that you can configure, while differential analog input modules will show eight points that you can configure.

Important!



Figure 8. Analog Input Module Definition.

3) Edit each point:

Position the cursor on a Point definition and choose Edit from the Module Definition dialog box to define a name and description for each I/O point. In the Analog Input Point dialog, enter a tag name (up to 12 characters) and a description (up to 40 characters). The tag names are used in the application program to represent the value of the analog input in your control algorithms and interlocks.

Figure 9. Defining an Analog Input Point.

Programming

Inputs are referenced in the application program through the tag names defined in the I/O Configuration Editor. The analog inputs will range in value from 0 to 4095 over the voltage range configured for the analog input module. Most


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often you will want to scale the analog input values to a more convenient engineering unit number range.

Scaling Analog Inputs

The scaling function block is used to convert the raw 0 to 4095 units of the analog input to an engineering unit number. The result of this scaling conversion is usually stored in a shared variable register that you define in the shared variable editor. After scaling the analog input to a register, you can use the register tag name in your applications to work with the process variable in engineering units.

An example of an analog scaling entry is shown in Figure 10. For more details about configuring analog scaling function blocks refer to Using the Analog Scaling Editor in Section 5 Working with Programs and Function Blocks in the Regent User’s Guide.

Figure 10. Analog Scaling Example.



Programming Fault Tolerant Analog Inputs

To program fault tolerant configurations using triplicated analog input modules, a midvalue element can be used as shown in Figure 11.

Figure 11. Programming Fault Tolerant Analog Inputs.

In this illustration, VALUE_A_NAME, VALUE_B_NAME, and VALUE_C_NAME represent the three analog inputs to be mid-value selected. ERROR_A_NAME, ERROR_B_NAME and ERROR_C_NAME are the error bits for the analog inputs. RESULT_NAME is the result of the mid-value instruction. The field Limit is the integer value, in similar units to the Value A, B and C variables, that an analog input can deviate from the mid-value result before signaling an error (via the Error A, B or C bits). Once an error bit is set, it is latched. RESET_NAME is the reset bit used to reset the latched error bits.

Maintenance

There are no user-replaceable parts inside the module. Modules must be calibrated for the particular input range within which they will operate. All modules are calibrated before being shipped by ICS; however, modules require calibration whenever:

· the module is configured for a different operating voltage range (factory configuration is 1 to 5 VDC),

· the module is configured for a different operating mode (factory configuration is 16 channel, single-ended), or

· once per year after installation, to adjust for drift in the analog circuitry. Drift rates are listed under Specifications, below. These drift rates should be used to


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help you determine the frequency for checking the calibration of the modules in your installation.

Calibration Methods

Calibrating the analog input module requires that you connect calibration voltages to all of the analog input channels of the module and adjust the trimming potentiometers until the analog inputs read the correct calibration values. During calibration the module must be installed in a Regent system and disconnected from the field signal wiring while the calibration voltages are connected to the module input signals.

There are three trimming potentiometers which are accessible through the front face of the module making calibration adjustments possible without opening the module’s cover. However, the corresponding field wiring will have to be disconnected from the I/O chassis terminals.

If you do not wish to disturb the field wiring during calibration, the I/O Extender module (catalog T3322), can be used. With the analog input module PCB removed from the module housing and plugged into the I/O extender module, you can connect the calibration voltages to the I/O extender module and leave the analog input field wiring in place. This is the recommended method for calibrating the analog inputs. and is described below in the calibration procedure.

Calibration Procedure

Equipment Required

· DC signal source with a range from -10 VDC to +10 VDC @ 10 mA minimum and with an accuracy and resolution of better than 100 mVDC.

· Potentiometer adjustment tool.

· Phillips screwdriver

· I/O module extender, catalog number T7322 (recommended).

· PC running the WINTERPRET software, used to monitor the analog input channel values during calibration.



Calibration Preparation

The module must be calibrated while connected to an I/O chassis of an operational Regent system.

During calibration, the analog input module will be disconnected from the actual field devices. Appropriate precautions should be taken to ensure that the disconnection of the field sensors does not pose a safety risk to plant personnel or process equipment.

There are Offset, Gain and CMR (Common Mode Rejection) potentiometers that are common to all of the analog input channels. These potentiometers are located on the front of the analog input PCB (see Figure 12). During the calibration procedure the Offset and Gain potentiometers will be adjusted. The CMR potentiometer is factory adjusted and does not require adjustment in the field.

Important!


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Figure 12. Analog Input Module Calibration Potentiometer Locations.

The I/O extender module has jumper posts that allow you to connect or disconnect the I/O slot field wiring on the I/O chassis to the printed circuit board plugged into the I/O extender. During the calibration steps you will remove any jumpers installed on these posts in order to connect the DC voltage signal source to the analog inputs. For modules configured for 16-channel, single-ended inputs, Figure 13 shows the jumper posts to which you should connect the signal source for each analog input channel. For modules configured for 8-channel, differential inputs, Figure 14 shows the jumper posts to which you should connect the signal source for each analog input channel.



Figure 13. I/O Extender Connections for Single-Ended Analog Input Calibration.


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Figure 14. I/O Extender Connections for Differential Analog Input Calibration.

Within each pair of jumper posts, make sure that you connect the voltage source to the jumper posts nearest the front of the I/O extender. Do not make any connections to the jumper posts nearest the I/O chassis backplane — these connect to the actual field wiring attached to the I/O slot terminals on the I/O chassis.

Calibration Steps

1. Remove the module to be calibrated from the I/O chassis.

2. Install the I/O extender module into the slot from which the module was removed.

3. Remove the jumpers (if installed) labeled CH1 through CH16 from the I/O extender module.

Important!



4. Connect the DC voltage signal source to the I/O extender jumper posts as shown in Figures 13 or 14. Use test clips as required to make the connections.

5. Remove the four screws on one side of the module and remove the printed circuit board from the module clamshell housing.

6. Install the printed circuit board into the I/O extender module. Allow the board to warm up for approximately one minute.

7. Adjust the DC voltage source to the Offset Input Voltage value indicated in Table 5 for the configured input range of the input module. Wait approximately one minute for the analog inputs to stabilize.

8. Using the monitoring functions of WINTERPRET, monitor the values of all the analog input channels. Refer to the Regent User’s Guide for more details about the monitoring functions.

9. Adjust the Offset potentiometer (R569) for an average reading of 2 ±1 for all input channels. Verify that all input channels read between 1 and 3. If one or more channels reads significantly different, return the module to ICS for repair.

10. Adjust the DC voltage source to the Gain Input Voltage value indicated in Table 5 for the configured input range of the input module. Wait approximately one minute for the analog inputs to stabilize.

11. Adjust the Gain potentiometer for a reading of 4093 ±1 for all channels. Verify that all input channels read between 4092 and 4094. If one or more channels reads significantly different, return the module to ICS for repair.

12. Repeat steps 7 through 11 and make adjustments if necessary until both the Offset and Gain values read correctly. There is some interaction between the Offset and Gain adjustments so often you will need to repeat these steps a few times until both the Offset and Gain readings read correctly without further adjustments.

13. Calibration is complete. Unplug the printed circuit board from the I/O extender module and replace it in its


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clamshell housing. Remove the I/O extender module from the I/O chassis and reinstall the calibrated module in the I/O chassis.

The module’s red Fault indicator will be on until you perform a voted reset by pressing the Reset buttons on two of the Regent processor modules. After the voted reset is complete, the module’s green Active indicator should turn on.

Table 5. Analog Calibration Voltages.

Configured Voltage Range

Offset Input Voltage Gain Input Voltage

0.00 to +10.00 volts 0.0049 VDC 9.9951 VDC

-10.00 to +10.00 volts 9.9902 VDC 9.9902 VDC

+1.00 to +5.00 volts 1.0020 VDC 4.9980 VDC

0.00 to +5.00 volts 0.0024 VDC 4.9976 VDC

-5.00 to +5.00 volts 4.9951 VDC 4.9951 VDC

Safety Considerations

The analog input modules are TÜV certified as non-interfering and when properly configured are also certified for Risk Class 5 safety critical inputs. Safety critical configurations include midvalue selection methods.

In safety critical input applications using a single sensor, it is important that the sensor failure modes be predictable and well understood, so there is little probability of a failed sensor not responding to a critical process condition. In such a configuration, it is important that the sensor be tested regularly, either by dynamic process conditions that are verified in the Regent, or by manual intervention testing.

Redundant sensors can be used with redundant input modules to eliminate any single points of failure and extend fault tolerance to include the sensors.

For additional safety considerations, please refer to the Safety Considerations section of the Regent User’s Guide.



Specifications

Safetybus Power 1.85 load units

Number of Inputs Eight differential or 16 single-ended (jumper selectable)

Inputs Per Group Eight single-ended or four differential

Ranges Voltage:

Current:

(using external 250W resistors)

0.00 to +10.00 volts -10.00 to +10.00 volts +1.00 to +5.00 volts 0.00 to +5.00 volts -5.00 to +5.00 volts

0.00 to +20.00 mA -40.00 to +40.00 mA +4.00 to +20.00 mA 0.00 to +20.00 mA -20.00 to +20.00 mA

External Power None for module electronics; however, analog field loop power is not supplied by the module

Accuracy and Drift (Accuracy/Drift) -10 to +10 volts: 0.00 to +10.00 volts: -5.00 to +5.00 volts: 0.00 to +5.00 volts: +1.00 to +5.00 volts:

Note: Initial accuracy (% of span) represents the initial accuracy @ 22ºC to 28ºC calibration temperature.

0.12%/100 ppm/°C 0.08%/55 ppm/°C 0.13%/110 ppm/°C 0.10%/65 ppm/°C 0.10%/70 ppm/°C


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Out of Range Thresholds

Over-range -10.00 to +10.00 volts: 0.00 to +10.00 volts: -5.00 to +5.00 volts: 0.00 to +5.00 volts: +1.00 to +5.00 volts:

Under-range -10.00 to +10.00 volts: 0.00 to +10.00 volts: -5.00 to +5.00 volts: 0.00 to +5.00 volts: +1.00 to +5.00 volts:

Expressed in volts:

+10.30 min., +10.70 max. +10.30 min., +10.70 max. +5.15 min., +5.35 max. +5.15 min., +5.35 max. +5.12 min., +5.28 max.

-10.30 min., -10.70 max. -0.30 min., -0.70 max. -5.15 min., -5.35 max. -0.15 min., -0.35 max. +0.88 min., +0.72 max.

Over Voltage Protection Powered AI1-AI16: AREF 1,2: Acceptable Duration: Unpowered AI1-AI16: AREF 1,2: Acceptable Duration:

±60 VDC/85 VAC RMS/±400 VDC


Indefinite/Indefinite/1 msec



Indefinite/Indefinite/1 msec

Frequency Response (-3 dB/-30 dB/Atten. @ 60 Hz) Single-Ended T7420A: T7420AF: Differential T7420A: T7420AF:

7.23 Hz/229 Hz/18.4 dB 10.6 KHz/335 KHz/0.0 dB 3.62 Hz/114 Hz/24.4 dB 5.31 KHz/168 KHz/0.0 dB

Data Update Rate Single-ended or 16- channel mode: Differential or 8-channel mode:

3.60 msec on a continuous repeating basis 1.80 msec on a continuous repeating basis

Isolation 2500 volts minimum (field wiring to control logic)

Heat Dissipation 9 Watts, 31 BTUs/hour



Operating Temperature 0° to 60° C (32° to 140° F)

Storage Temperature -40° to 85° C (-40° to 185° F)

Operating Humidity 0 to 95% relative humidity, non-condensing

Vibration 10 to 55 Hz:

±0.15mm

Shock Operating:

15 g, ½ sine wave, 11 msec

Electromagnetic Interference

• IEC 801 Part 2 - Electrostatic Discharges

• IEC 801 Part 3 - Radiated Electromagnetic Fields

Level 3: Contact discharge of 6 kV

Level 3: 10 V/M, 27 MHz - 500 MHz

Safety Certified to DIN V VDE 0801 for Risk Class 5. Also designed to meet UL 508 and CSA 22.2, No. 142-M1981

Dimensions Height: Width: Depth:

12.6" (320 mm) 1.27" (32 mm) 10.12" (257 mm)

Weight 3.0 lbs (1.4 kg)


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Miscellaneous Input Circuit Specifications

Function Signal Mode Value

I leakage AI1 through AI16 — 50 nanoA (max.)

Rin (re AGND) AI1 through AI16 — 100 Mohm (min.)

Rin (re AREF2) AREF1 — 100 Mohm (min.)

Rin (note 1) AI1 through AI16 SE 100 Mohm (min.)

CMR (note 2) AI1 through AI16 SE 51 dB min.

CMR (note 3) AI1 - AI16 SE 41 dB min.

CMR (note 4) AI1 through AI16 SE 66 dB min.

NMR (note 5) AI1 through AI16 SE (note 5)

Rin (re AGND) AI1/2 - AI15/16 DIFF 100 Mohm (min.)

CMR (note 6) AI1/2 - AI15/16 DIFF 72 dB min.



NMR (note 9) AI1/2 - AI15/16 DIFF (note 9)

Notes:

1) AI1 through AI8 are referenced to AREF1. AI9 through AI16 are referenced to AREF2.

2) CMR: DC to 20 kHz, AI1-AREF1 through AI8-AREF1, AI9-AREF2 through AI16-AREF2. Referenced to AGND (model T7420A).

3) CMR: Same as note 2 except model T7420AF.

4) CMR: 60Hz, AI1-AREF1 through AI8-AREF1, AI9-AREF2 through AI16-AREF2. Referenced to AGND.

5) Normal mode rejection (single ended).

6) CMR: DC to 20 kHz, Differential signal referenced to AGND.

7) CMR: Same as note 6 except model T7420AF.

8) CMR: 50 Hz, Differential signal referenced to AGND.

9) Normal mode rejection (differential).

Documents

ICS Regent+Plus - Rockwell Automation...A block diagram of the analog input module is shown in Figure 1. Figure 1. Block Diagram of Analog Input Module. Analog field signals are conditioned