Response Times - Siemens Simatic S7-1500 Manual

Response times

Introduction
The next section shows the response times of the digital input module F-DI 16x24VDC. The
response times of the digital input module F-DI 16x24VDC are included in the calculation of
the F-system response time.
Definition of cycle time for fail-safe digital inputs
The cycle time indicates the time between the occurrence of an event and the transfer to the
backplane bus.
Times required for the calculation
● Max. cycle time: T
● Max. acknowledgment time (Device Acknowledgment Time): T
The maximum response time in the case of fault (One Fault Delay Time, OFDT) is equivalent
to the maximum response time with no faults (Worst Case Delay Time, WCDT).
Maximum response time with no faults (Worst Case Delay Time, WCDT) during 1oo1 evaluation
The following formula applies to a sensor supply without short-circuit test:
t <= 2 * cycle time + input delay
The following formula applies to a sensor supply with short-circuit test:
t <= 2 * cycle time + input delay + T1 + T2
T1
T2
Maximum response time with no faults (Worst Case Delay Time, WCDT) during 1oo2 evaluation
The following formula applies to a sensor supply without short-circuit test:
t <= 2 * cycle time + input delay+ discrepancy time*
* Obsolete with discrepancy behavior "Supply value 0"
The following formula applies to a sensor supply with short-circuit test:
t <= 2 * cycle time + input delay+ max (T1p + T2p, T1s + T2s) + discrepancy time*
* Obsolete with discrepancy behavior "Supply value 0"
T1p
T2p
T1s
T2s
60
= 5 ms
cycle
Time for short-circuit test
Startup time of sensors after the short-circuit test
Test time for the sensor supply of sensor 1
Startup time of sensor after the short-circuit test (sensor 1)
Test time for the sensor supply of sensor 2
Startup time of sensor after the short-circuit test (sensor 2)
DAT
Digital input module F-DI 16x24VDC (6ES7526-1BH00-0AB0)
Manual, 01/2016, A5E03858068-AA
A
= 10 ms