ET 200S Distributed I/O System - Fail-Safe Modules
Installation and Operating Manual, 08/2008, A5E00103686-07
201
Response times
D
Introduction
The response times of the ET 200S F-modules are listed below. The response time of F-
modules is included in the calculation of the F-system response time.
Information about the calculation of F-system response times is available in the
Safety
Engineering in SIMATIC S7
System Description.
Definition of Response Time
For fail-safe digital inputs: The response time defines the interval between a signal transition
at the digital input and the reliable availability of the safety message frame on the backplane
bus.
For fail-safe digital outputs: The response time defines the interval between the receipt of a
safety message frame from the backplane bus and the signal transition at the digital output.
Maximum response time of the PM-E F pm DC24V PROFIsafe
The maximum response time of the PM-E F pm DC24V PROFIsafe (with or without fault) is
equivalent to the maximum internal processing time T
max
.
The internal processing times of the electronic PM channel depend on the readback time
parameter setting (see table below).
Table D- 1 PM-E F pm DC24V PROFIsafe: Internal processing times of the electronic PM channel
PM-E F pm DC24V PROFIsafe (electronic PM channel)
Programmed
Readback Time
Limit Frequency Minimum Internal Processing
Time T
min
Maximum Internal
Processing Time T
max
1 ms 32.3 Hz 4 ms 16 ms
5 ms 28.6 Hz 4 ms 20 ms
10 ms 25.0 Hz 4 ms 25 ms
50 ms 12.5 Hz 4 ms 55 ms
100 ms 7.7 Hz 4 ms 90 ms
200 ms 4.3 Hz 4 ms 150 ms
400 ms 2.3 Hz 4 ms 300 ms
Table D- 2 PM-E F pm DC24V PROFIsafe: Internal processing times of the P1/2 channel
Measuring Channel Minimum Internal
Processing Time T
min
Maximum Internal
Processing Time T
max
PM-E F pm DC24V PROFIsafe (P1/2
channel; relay; switch on)
4 ms 10 ms
PM-E F pm DC24V PROFIsafe (P1/2
channel; relay; switch off)
6 ms 14 ms
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