Response Times - Siemens SIMATIC S7-1500 Manual

Response times

Introduction
The next section shows the response times of the digital output module
F-DQ 8×24VDC/2A PPM. The response times of digital output module
F-DQ 8×24VDC/2A PPM 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 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 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).
Assign the parameters for maximum readback time dark test (Maximum Readback Time, T
and a maximum readback time switch-on test (Maximum Readback Time Switch-On Test,
T
rb_swon
Maximum response time with no faults (Worst Case Delay Time, WCDT)
t <= 3 * cycle time + max (T
Maximum response time with detection of a channel fault by readback
t <= 4 * cycle time + 2 * max (T
Maximum response time with detection of a channel fault by bit pattern test
t <= 2 * cycle time + maximum test time
Maximum response time with detection of a wire break at "1" signal
t <= 3 * cycle time + 1000 ms (wire break detection) + max (T
Maximum response time with detection of an overload at "1" signal
t <= 4 * cycle time + max (T
Maximum response time with detection of an overload or wire break at "0" signal and light test
activated.
t <= 2 * cycle time + maximum test time
54
= 5 ms
cycle
) in STEP 7.
, T
rb
, T
rb
)
rb_swon
, T )
rb rb_swon
)
rb_swon
Digital output module F-DQ 8x24VDC/2A PPM (6ES7526-2BF00-0AB0)
= 10 ms
DAT
, T )
rb rb_swon
Manual, 01/2016, A5E03858037-AA
A
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rb