Siemens SIMATIC ET 200SP Manual page 98

Technical specifications
9.5 Calculation of monitoring times and response times
Tab "max. response times"
In the "Input" section, select one of the following variants for the relevant signal flow of the
safety function depending on which head module (IM) of the ET 200SP is being used:
● Variant 3 (distributed F-I/O via PROFINET IO)
Use the values from the following table.
Table 9- 4 Values for calculating the max. response times
Description
Max. discrepancy time
(Note: The safe value 0 is supplied
while the discrepancy time is running)
Maximum response time in error-free
operation
Maximum response time
when an error is present
Max. acknowledgment time of the F-I/O
Configured PROFIsafe monitoring time
Max. response time of sensor
Note:
For T_Sensor_DLY, the part of the system
starting from the F-CM AS-i Safety ST module
up to the sensor, including the AS-i bus, is
considered.
98
Designation
T_DIS
T_WCDT
T_OFDT
T_DAT
T_PSTO, conf.
(see the setting on the PROFISAFE tab of the properties
T_Sensor_DLY 10 ms (signal flow of AS-i Bus)
+ Assigned input delay
+ Response time of the sensor
+ Additional response time in the safe AS-i input
slave
Fail-safe Module F‑CM AS‑i Safety ST (3RK7136‑6SC00‑0BC1)
Value
0
20 ms
20 ms
20 ms
F_WD_TIME
dialog)
Manual, 03/2017, A5E03957059020A/RS-AB/002