Response Times - Siemens SIMATIC ET 200SP Equipment Manual

Response times

Maximum response time in an error-free scenario (worst case delay time, WCDT) for 1oo2
evaluation.
The following formula applies to a sensor supply without short-circuit test:
Maximum response time (T
The following formula applies to a sensor supply with short-circuit test:
Maximum response time (T
Discrepancy time*
*) Is omitted for discrepancy behavior "Supply value 0"
T1p = Time for short-circuit test (sensor 1)
T2p = Startup time of sensor after short-circuit test (sensor 1)
T1s = Time for short-circuit test (sensor 2)
T2s = Startup time of sensor after short-circuit test (sensor 2)
In case of a 1oo2 evaluation, the discrepancy time in the SIMATIC STEP7 response time table
must be set to 0.
Maximum response time to external short-circuits (one fault delay time, OFDT)
Maximum response time (T
Tsx summation term:
(T1x + T2x) < T
(T1x + T2x) >= T
For deactivated sensor supplies or sensor supplies with deactivated short-circuit test, the
value 0 has to be used in the formula for Tsx.
70
) = 2 * T
WCDT
) = 2 * T
WCDT
) = Input delay + T
OFDT
→ Tsx = T
cycle cycle
→ Tsx = max (T1x, T
cycle
+ Input delay+ Discrepancy time*
cycle
+ Input delay + max (T1p + T2p, T1s + T2s) +
cycle
+ (n * T
cycle cycle
) + T2x
cycle
Digital input module F-DI 8x24VDC HF (6ES7136-6BA01-0CA0)
Equipment Manual, 10/2021, A5E50578307-AA
) + Sum[x=0...7](Tsx)