Siemens SIMATIC ET 200AL, System Manual

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Digital I/O module F-DI 4+F-DQ 2x24VDC/2A, 4xM12 (6ES7146-5FF00-0BA0)
Equipment Manual, V1.0, 05/2021, A5E51082342-AA
83
Response times
B
B.1 Maximum response time
This section shows the response times of the F-DI 4/F-DQ 2 Fail-Safe module. The response
times are included in the calculation of the F-system response time.
Definition of response time for fail-safe digital outputs
The response time represents the interval between an incoming safety message frame from
the ET-Connection and the signal change at the digital output.
Times required for the calculation
Maximum cycle time: T
cycle
= 23 ms
Maximum acknowledge time (Device Acknowledge Time): T
dat
= 18 ms
You assign the "Maximum readback time" and "Maximum readback time switch on test"
settings in STEP 7.
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
( http://support.automation.siemens.com/WW/view/en/49368678/133100) )" 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 T
cycle
parameter values given above include 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 can include in your calculations.
B.2 Response time parameters for the F-DI 4/F-DQ 2 digital inputs
Maximum Device Acknowledge Response Time of the F-DI 4/F-DQ 2 Fail-Safe module digital
inputs
1oo1 evaluation: