Response Times - Siemens SIMATIC ET 200SP Equipment Manual

Response times

Introduction
You can find the reaction times of the F-DQ 8x24 V DC/0.5 A PP HF digital output module
below. The reaction times of the F-DQ 8x24 V DC/0.5 A PP HF digital output module are
included in the calculation of the F-system reaction time.
Use the SIMATIC STEP7 Reaction Time Table
(https://support.industry.siemens.com/cs/ww/en/view/93839056) for this.
Definition of reaction time for fail-safe digital outputs
The reaction time represents the interval between an incoming safety message frame from
the backplane bus and the signal change at the digital output.
Times required for the calculation
• Max. cycle time: T
• Max. acknowledgment time (Device Acknowledgment Time): T
The maximum reaction time in the case of fault (One Fault Delay Time, OFDT) is equivalent to
the maximum reaction time with no faults (Worst Case Delay Time, WCDT).
You assign the parameters for maximum readback time dark test (T
readback time light test (T
Operating mode: Disable dark test for 48 hours – disabled
Maximum reaction time with no faults (Worst Case Delay Time, WCDT)
t <= 4 * T
Maximum reaction time with detection of a channel fault by readback
t <= 6 * T
Maximum reaction time with detection of a channel fault by bit pattern test
t <= 2 * T
58
= 8 ms
cycle
) in STEP 7 or the TIA Portal.
rb_lt
cycle
+ T
cycle rb
+ maximum test period
cycle
Digital output module F-DQ 8x24VDC/0.5A PP HF (6ES7136-6DC00-0CA0)
Equipment Manual, 12/2022, A5E38578424-AB
A
= 16 ms
DAT
) and maximum
rb