ET 200SP F-TM Count 1x1Vpp sin/cos HF (6ES7136-6CB00-0CA0)
Equipment Manual, V1.0, 01/2021, A5E47073911-AA
85
A.1 Maximum response time of the system
Calculating the maximum response time of the system
You can calculate your maximum system response time using the "SIMATIC STEP 7 Safety
Advanced: F-Execution Times, F-Runtimes, F-Monitoring and Reaction Times
(https://support.industry.siemens.com/cs/ww/en/view/58856512)" Excel file (RT_calculator).
Use your configured individual fail-safe module timing parameters and the module
characteristic parameters found in this appendix to determine the maximum response time of
your system.
Data transport delays included
The Tcycle parameter value in the following paragraph includes an allowance for the fail-safe
module to acquire and deliver PROFIsafe messages in transactions with the PLC I/O bus. The
execution time of the Safety FB in the fail-safe CPU includes the physical transport delay time
for PROFIsafe messages moving between the fail-safe module location and the fail-safe CPU.
There are no separate transport delay parameters that you must include in your calculations.
A.2 Response times of the F-TM Count module
Maximum response time of the F-module input values
TWCDT_i = Tcycle * 2
Where:
cycle
Internal cycle time of the fail-safe module
WCDT_i
Worst Case Delay Time: Maximum response time from a signal transition at the
fail-safe module's counter input to the reliable availability of the safety message frame
available for the fail-safe CPU request
Count, status, and event values are reported during each Tcycle. In situations where an
individual count of a movement is slower than T
cycle, the same value can be reported across
one or more T
cycles.
The response time for counts, status, and event values is essentially a single T
cycle. For output
image register commands, the response time behavior T
cycle * 2 applies. The maximum
response time is defined as twice the cycle time for simplicity.
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