8/2/2019 How Can I Find the Cycle Time of an S7-200 Program
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S7-200 CPUs -- Operation and maintenance -- Querying status
How can I find the cycle time of an S7-200 program?
Test of the Battery module S7-200
How can I find the cycle time of an S7-200 program?Display part
number
Instructions:To identify the cycle time of a STEP 7-Micro/WIN -
project in a S7-200 CPU, select the command"Information..." in the
main CPU menu in STEP 7-Micro/WIN.The three cycle times are
displayed in the box "Cycle rates (ms)":
l The last required cycle time ("Last:"),l The minimum cycle
time ("Lowest:") andl The maximum cycle time ("Highest:")
since the last STOP-RUN transition of the CPU.
You can access this information in the user program in the
special flag area.The cycle time of the last cycle is in SMW 22.The
shortest cycle run since the last STOP-RUN transition is in SMW 24
andthe longest cycle run is in SMW 26.
Test of the Battery module S7-200
Display part number
QUESTION:How can I recognize whether the optional battery module
for the S7-200 still provides sufficientvoltage?
ANSWER:There is no possibility to measure or record via a
program routine whether the optional battery modulestill provides
sufficient voltage. Besides, the CPU does not assign any bit with
this information.If the battery module is located in the CPU, it
has to be removed from there. Afterwards, connectshortly a 100 kOhm
resistance between two pins of the battery - still more than 2,2 V
DC have to belocatable at the resistance.
According to the used CPU-Type, the battery modules are
different and it has to be mesasuredbetween different pins:
l For the CPUs of the second generation (S7-22x) the resistance
(100 kOhm) has to connectedbetween the Pins 2 and 6 of the battery
module in a row,
l for the CPUs of the first generation (S7-21x) the resistance
(100 kOhm) has to be connectedbetween the Pins 1 and 5 of the
battery module in a row.
To measure correctly between the right pins when using the
battery module BC 293, turn the batterymodule around as shown in
Fig. 1.
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8/2/2019 How Can I Find the Cycle Time of an S7-200 Program
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Fig. 1: View Battery module BC 293
Note:The S7-200 CPU includes the special marker bit SM0.2, which
is set for a cycle during the start-up ifthe remanent data went
lost.By a flat curve of discharge of a Lithium-Battery, the battery
status is hardly determinable. Thus, nostatement can be given about
the capacity which is still available.
To avoid a data loss after the expiry of buffer time, we
recommend the storage of data into internalEEPROM of the CPU - see
Entry-ID 17471561.
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