Siemens SIMATIC S7-400H - Run Times of the FCs and FBs for Redundant I;O

Technical Specifications
13-10
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
13.3 Run Times of the FCs and FBs for Redundant I/O
Table 13-1 Run times of the blocks for redundant I/O
Block
Run time in single/single mode Run time in redundant mode
FC 450 RED_INIT
Specifications are
based on the startup
2 ms + 300 s / configured module
pairs
The specification for a module pair is a
mean value. The run time may be <
300 s for a few modules. For the
great majority of redundant modules
the value may even be > 300 s.
–
FC 451 RED_DEPA 160 s 360 s
FB 450 RED_IN
Invoked from the
corresponding
sequence level.
750 s + 60 s / module pair of the
current TPA
The specification for a module pair is a
mean value.
The run time may be additionally
increased if discrepancies occur
resulting in passivation and logging to
the diagnostics buffer.
The run time may also be increased by
a depassivation carried out in the
individual sequence levels of FB
RED_IN. Depending on the number of
modules in the sequence level, the
depassivation may increase the run
time of the FB RED_IN by 0.4 to 8 ms.
An 8 ms increase can be expected in
redundant operation of modules
totalling more than 370 pairs of
modules in a sequence level.
1000 s + 70 s/ module pair of the
current TPA
The specification for a module pair is a
mean value.
The run time may be additionally
increased if discrepancies occur
resulting in passivation and logging to
the diagnostics buffer.
The run time may also be increased by
a depassivation carried out in the
individual sequence levels of FB
RED_IN. Depending on the number of
modules in the sequence level, the
depassivation may increase the run
time of the FB RED_IN by 0.4 to 8 ms.
An 8 ms increase can be expected in
redundant operation of modules
totalling more than 370 pairs of
modules in a sequence level.
FB 451 RED_OUT
Invoked from the
corresponding
sequence level.
650 s + 2 s / module pair of the
current TPA
The specification for a module pair is a
mean value. The run time may be < 2
s for a few modules. For the great
majority of redundant modules the
value may even be > 2 s.
860 s + 2 s / module pair of the
current TPA
The specification for a module pair is a
mean value. The run time may be < 2
s for a few modules. For the great
majority of redundant modules the
value may even be > 2 s.