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AS-Interface
Your Safety Network
"Terms & Conditions of Sale" information is printed on every order acknowledgement; copies are available upon request.
We reserve the right to make modifications and no guarantee of the accuracy of the information contained herein is given.
Pepperl+Fuchs® Inc. • Telephone (330) 486-0001 • FAX (330) 405-4710 • E-mail: [email protected] • www.am.pepperl-fuchs.com
© 2004 Pepperl+Fuchs® Inc., Twinsburg, Ohio ASIS 0604 (905616) Printed in U.S.A.
Consequently, the bit values transmitted by the SafetyNode are not the actual values of the inputs. As long as the SafetyNode transmits the dynamic pattern the inputs have not been activated. When a safety related input has been activated, the SafetyNode sends the 0000 bit pattern. In other words, a SafetyNode is in one of two states: safety inputs NOT activated (dynamic bit pattern) or safety inputs activated (static 0000 bit pattern).
How many inputs are on a SafetyNode?A P+F SafetyNode has two safe inputs, which allows the implementation of a safety system up to Safety Category 4 (two redundant contacts connected to two inputs on the SafetyNode). The rating of the Safety Category is increased or reduced depending upon the rating of the input device (e-stop button, blade switch, etc.). A Category 3 input used in conjunction with the P+F SafetyNode results in a Category 3 installation at best.
Can a PLC or PC read the state of the safety inputs?Yes. As soon as a SafetyNode indicates that safety input has been activated, it stops transmitting its dynamic bit pattern. The PLC/PC can simply monitor the data from the SafetyNode, checking for the 0000 bit pattern. All other bit patterns can be neglected as they are part of the dynamic data cycle and indicate normal operation. This eliminates the costly and time-consuming process of wiring auxiliary contacts for monitoring the status of safety devices to the PLC.
Can a PLC or PC read the state of the OSSDs on the SafetyMonitor?Yes. By assigning an AS-Interface address to the SafetyMonitor, the PLC can read the states of the OSSDs.
How many SafetyNodes and SafetyMonitors can be on an AS-Interface network?AS-Interface allows SafetyNodes to have addresses 01 to 31. A SafetyNode requires one address, resulting in up to 31 SafetyNodes on one AS-Interface network. Because SafetyMonitors do not require a node address they do not count towards the 31 available node addresses. If, on the other hand, a user wants to monitor the states of the OSSDs on a SafetyMonitor, the monitor itself needs an address.
Which approvals have been obtained?AS-Interface Safety at Work has been evaluated by the German BIA (Berufsgenossenschaftliches Insitut fuer Arbeitssicherheit) and tested by an NRTL (TUV Rheinland). P+F has approval for testing according to EN954 and IEC 61508. Most important for the North American markets, approvals according to NFPA 97 have been granted. In addition to those safety-relevant approvals, AS-Interface Safety at Work devices are UL listed for ordinary locations.
If no “normal” I/O is used on AS-Interface, is it necessary to have a gateway or scanner?Yes. Even in cases where no “normal” I/O data is used and AS-Interface is not part of the I/O control system, it is necessary to have a gateway or scanner. The gateway/scanner provides the “clocking” function such that the SafetyMonitor can evaluate the data transmitted by the SafetyNode. Remember the SafetyMonitor is strictly a passive “listening” device.
How is AS-Interface Safety at Work confi guredThe SafetyMonitor is confi gured using the confi guration software tool (VAZ-SW-SIMON). This intuitive tool allows convenient confi guration and verifi cation. A printable Safety-Log, typically reviewed by the safety engineer, is generated automatically and further simplifi es the documentation. Naturally, all confi guration steps are tightly controlled and password protected where necessary.
Power Supply
Gateway or Scanner
SafetyNode SafetyMonitor
SafetyNode
Input/Output Modules (Non-Safety)
SafetyNodes SafetyMonitor
Does AS-Interface Safety at Work require a separate network?No. AS-Interface Safety at Work is an integral part of a “normal” AS-Interface network and does not require a separate system. Since the safety data runs over the same physical network, the user gains important benefi ts:
• Place safety where needed; even late in the project
• Monitor the status of the safety inputs and the safety relay
• Associate multiple safety inputs with one relay
• Associate one input with multiple relays
What is AS-Interface?Actuator Sensor Interface (or AS-Interface) is a 2-wire networking solution for discrete I/O, analog data, encoders and intelligent sensors. AS-Interface has many strong points, and based on feedback from current users the most outstanding features are:
• Totally open topology (yes, we mean no limitations on how to route and split network runs)
• Power and data run over a nonshielded, 2-wire cable without termination
• Deterministic and fast I/O update time
• Very high degree of noise immunity
• Automatic reconfi guration after a single failed node has been replaced
• Truly open system, supported by all major PLC manufacturers
Which components are needed to build a network?AS-Interface Safety at Work uses a “normal” AS-Interface system with only two additional items: (1) a SafetyNode and (2) a SafetyMonitor. A generic Safety at Work system is shown.
The components that are not enclosed within the yellow/black boxes are the nonsafe I/O nodes, power supply and AS-Interface gateway or scanner. The components that are enclosed within the yellow/black boxes are the safety related items. It is not necessary to have the SafetyMonitor in close proximity to the SafetyNode. In fact, the SafetyMonitor located at the top, in the right corner could be associated with the SafetyNodes at the bottom of the image.
Which types of safe inputs are used with Safety at Work?Currently, any safety device with a dry-contact output can be used. Safety devices integrated with AS-Interface (intelligent e-stops, blade switches, door interlocks, etc.) may be used. Even light curtains with electronic Output Signal Switching Devices (OSSDs) can be connected.
What is the difference between a safety input and regular inputs?Safety data on AS-Interface is transmitted as a series of dynamic messages. When confi gured, the SafetyMonitor reads the dynamic data tables from the SafetyNodes and stores them in memory. During operation, the data in the table is compared with the dynamic data sent by the SafetyNodes. The SafetyMonitor goes into a safe state (the OSSDs are opened) whenever a SafetyNode transmits a message that includes four zero-bits (0000). The SafetyMonitor also goes into a safe state when the received bit pattern does not agree with the expected bit pattern (the one stored in memory).
Why Safety at Work?The practice of networking safety components is well established in Europe. The potential cost savings combined with superior troubleshooting capabilities and much simpler installation makes networked safety exciting for integrators and end users alike.
SafetyNode with outputs — Enclosure mount
SafetyMonitor
SafetyNode with outputs — Field mount
E Stop with integrated Safety at Work interface
Power Supply
Gateway or Scanner
SafetyNode SafetyMonitor
SafetyNode
Input/Output Modules (Non-Safety)
SafetyNodes SafetyMonitor
Does AS-Interface Safety at Work require a separate network?No. AS-Interface Safety at Work is an integral part of a “normal” AS-Interface network and does not require a separate system. Since the safety data runs over the same physical network, the user gains important benefi ts:
• Place safety where needed; even late in the project
• Monitor the status of the safety inputs and the safety relay
• Associate multiple safety inputs with one relay
• Associate one input with multiple relays
What is AS-Interface?Actuator Sensor Interface (or AS-Interface) is a 2-wire networking solution for discrete I/O, analog data, encoders and intelligent sensors. AS-Interface has many strong points, and based on feedback from current users the most outstanding features are:
• Totally open topology (yes, we mean no limitations on how to route and split network runs)
• Power and data run over a nonshielded, 2-wire cable without termination
• Deterministic and fast I/O update time
• Very high degree of noise immunity
• Automatic reconfi guration after a single failed node has been replaced
• Truly open system, supported by all major PLC manufacturers
Which components are needed to build a network?AS-Interface Safety at Work uses a “normal” AS-Interface system with only two additional items: (1) a SafetyNode and (2) a SafetyMonitor. A generic Safety at Work system is shown.
The components that are not enclosed within the yellow/black boxes are the nonsafe I/O nodes, power supply and AS-Interface gateway or scanner. The components that are enclosed within the yellow/black boxes are the safety related items. It is not necessary to have the SafetyMonitor in close proximity to the SafetyNode. In fact, the SafetyMonitor located at the top, in the right corner could be associated with the SafetyNodes at the bottom of the image.
Which types of safe inputs are used with Safety at Work?Currently, any safety device with a dry-contact output can be used. Safety devices integrated with AS-Interface (intelligent e-stops, blade switches, door interlocks, etc.) may be used. Even light curtains with electronic Output Signal Switching Devices (OSSDs) can be connected.
What is the difference between a safety input and regular inputs?Safety data on AS-Interface is transmitted as a series of dynamic messages. When confi gured, the SafetyMonitor reads the dynamic data tables from the SafetyNodes and stores them in memory. During operation, the data in the table is compared with the dynamic data sent by the SafetyNodes. The SafetyMonitor goes into a safe state (the OSSDs are opened) whenever a SafetyNode transmits a message that includes four zero-bits (0000). The SafetyMonitor also goes into a safe state when the received bit pattern does not agree with the expected bit pattern (the one stored in memory).
Why Safety at Work?The practice of networking safety components is well established in Europe. The potential cost savings combined with superior troubleshooting capabilities and much simpler installation makes networked safety exciting for integrators and end users alike.
SafetyNode with outputs — Enclosure mount
SafetyMonitor
SafetyNode with outputs — Field mount
E Stop with integrated Safety at Work interface
AS-Interface
Your Safety Network
"Terms & Conditions of Sale" information is printed on every order acknowledgement; copies are available upon request.
We reserve the right to make modifications and no guarantee of the accuracy of the information contained herein is given.
Pepperl+Fuchs® Inc. • Telephone (330) 486-0001 • FAX (330) 405-4710 • E-mail: [email protected] • www.am.pepperl-fuchs.com
© 2004 Pepperl+Fuchs® Inc., Twinsburg, Ohio ASIS 0604 (905616) Printed in U.S.A.
Consequently, the bit values transmitted by the SafetyNode are not the actual values of the inputs. As long as the SafetyNode transmits the dynamic pattern the inputs have not been activated. When a safety related input has been activated, the SafetyNode sends the 0000 bit pattern. In other words, a SafetyNode is in one of two states: safety inputs NOT activated (dynamic bit pattern) or safety inputs activated (static 0000 bit pattern).
How many inputs are on a SafetyNode?A P+F SafetyNode has two safe inputs, which allows the implementation of a safety system up to Safety Category 4 (two redundant contacts connected to two inputs on the SafetyNode). The rating of the Safety Category is increased or reduced depending upon the rating of the input device (e-stop button, blade switch, etc.). A Category 3 input used in conjunction with the P+F SafetyNode results in a Category 3 installation at best.
Can a PLC or PC read the state of the safety inputs?Yes. As soon as a SafetyNode indicates that safety input has been activated, it stops transmitting its dynamic bit pattern. The PLC/PC can simply monitor the data from the SafetyNode, checking for the 0000 bit pattern. All other bit patterns can be neglected as they are part of the dynamic data cycle and indicate normal operation. This eliminates the costly and time-consuming process of wiring auxiliary contacts for monitoring the status of safety devices to the PLC.
Can a PLC or PC read the state of the OSSDs on the SafetyMonitor?Yes. By assigning an AS-Interface address to the SafetyMonitor, the PLC can read the states of the OSSDs.
How many SafetyNodes and SafetyMonitors can be on an AS-Interface network?AS-Interface allows SafetyNodes to have addresses 01 to 31. A SafetyNode requires one address, resulting in up to 31 SafetyNodes on one AS-Interface network. Because SafetyMonitors do not require a node address they do not count towards the 31 available node addresses. If, on the other hand, a user wants to monitor the states of the OSSDs on a SafetyMonitor, the monitor itself needs an address.
Which approvals have been obtained?AS-Interface Safety at Work has been evaluated by the German BIA (Berufsgenossenschaftliches Insitut fuer Arbeitssicherheit) and tested by an NRTL (TUV Rheinland). P+F has approval for testing according to EN954 and IEC 61508. Most important for the North American markets, approvals according to NFPA 97 have been granted. In addition to those safety-relevant approvals, AS-Interface Safety at Work devices are UL listed for ordinary locations.
If no “normal” I/O is used on AS-Interface, is it necessary to have a gateway or scanner?Yes. Even in cases where no “normal” I/O data is used and AS-Interface is not part of the I/O control system, it is necessary to have a gateway or scanner. The gateway/scanner provides the “clocking” function such that the SafetyMonitor can evaluate the data transmitted by the SafetyNode. Remember the SafetyMonitor is strictly a passive “listening” device.
How is AS-Interface Safety at Work confi guredThe SafetyMonitor is confi gured using the confi guration software tool (VAZ-SW-SIMON). This intuitive tool allows convenient confi guration and verifi cation. A printable Safety-Log, typically reviewed by the safety engineer, is generated automatically and further simplifi es the documentation. Naturally, all confi guration steps are tightly controlled and password protected where necessary.
