Reaction To Cpu Stop; Reactions To Counting Limit Violation - Siemens Simatic ET 200SP Equipment Manual

4.3

Reaction to CPU STOP

You set the response of the F-TM Count module to CPU STOP for the module in the device
configuration.
Table 4- 1
Option
Continue count-
ing
Stop counting
In situations where the F-CPU is in STOP mode, the count value can potentially be
affected.
The count value can be affected by the following behaviors:
• Your safety program states that may result during the commanded transition to STOP
• External channel-related errors that could occur while the F-CPU is in STOP mode.
• Power cycling of the module while the F-CPU is in STOP mode.
• Your safety program control of the software gate signal when transitioning again to RUN
Your safety program must determine whether the reported count value remains
representative of actual position when the behaviors above occur. If the position is lost,
your safety program must do a homing operation and then reset the counter to its
respective start value.
4.4

Reactions to counting limit violation

A counting limit can be violated when the counter value exceeds the high or low counting
limit. Reactions to violating a counting limit are as follows:
Table 4- 2
Option
Continue count-
ing
Stop counting
ET 200SP F-TM Count 1x1Vpp sin/cos HF (6ES7136-6CB00-0CA0)
Equipment Manual, V1.0, 01/2021, A5E47073911-AA
Response of technology module to CPU STOP
Meaning
The F-TM Count channel continues to count pulses while the F-CPU is in STOP
mode or while PROFIsafe communication is lost.
The F-TM Count channel does not continue to count. This is equivalent to closing
the SW gate.
WARNING
mode.
mode. Closing of the software gate results in the loss of counts during external
movement.
Response of technology module to counting limit violation
Meaning
The F-TM Count channel continues to count pulses while the counting limit is
violated after setting the count to either the opposite limit or to the start value.
The F-TM Count channel does not continue to count. This is equivalent to closing
the SW gate.
Parameters/address space
4.3 Reaction to CPU STOP
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