Siemens SIMATIC S7-400H - Runtimes of the Fcs and Fbs for Redundant I;Os

Technical data
20.6 Runtimes of the FCs and FBs for redundant I/Os
S7-400H
432 System Manual, 03/2012, A5E00267695-11
20.6 Runtimes of the FCs and FBs for redundant I/Os
Table 20- 1 Runtimes of the blocks for redundant I/Os
Block Runtime in stand-alone/single mode Runtime in redundant mode
FC 450 RED_INIT
Specifications are based
on the startup
2 ms + 300 µs / configured module pairs
The specification for a module pair is a mean
value. The runtime may be < 300 µs for a few
modules. For a large number of redundant
modules the value may be > 300 µs.
-
FC 451 RED_DEPA 160 µs 360 µs
FB 450 RED_IN
Called from the
corresponding sequence
level.
750 μs + 60 μs / module pair of the current
TPA
The specification for a module pair is a mean
value.
The runtime may be additionally increased if
discrepancies occur resulting in passivation
and logging to the diagnostic buffer.
The runtime may also be increased by a
depassivation carried out at the individual
sequence levels of FB RED_IN. Depending
on the number of modules in the sequence
level, the depassivation may increase the
runtime of the FB RED_IN by 0.4 ... 8 ms.
An 8 ms increase can be expected in
redundant operation of modules totaling more
than 370 pairs of modules at a sequence
level.
1000 μs + 70 μs / module pair of the current
TPA
The specification for a module pair is a mean
value.
The runtime may be additionally increased if
discrepancies occur resulting in passivation
and logging to the diagnostic buffer.
The runtime may also be increased by a
depassivation carried out at the individual
sequence levels of FB RED_IN. Depending
on the number of modules in the sequence
level, the depassivation may increase the
runtime of the FB RED_IN by 0.4 ... 8 ms.
An 8 ms increase can be expected in
redundant operation of modules totaling more
than 370 pairs of modules at a sequence
level.
FB 451 RED_OUT
Called from the
corresponding sequence
level.
650 μs + 2 μs / module pair of the current
TPA
The specification for a module pair is a mean
value. The runtime may be < 2 µs for a few
modules. For a large number of redundant
modules the value may be > 2 µs.
860 μs + 2 μs / module pair of the current
TPA
The specification for a module pair is a mean
value. The runtime may be < 2 µs for a few
modules. For a large number of redundant
modules the value may be > 2 µs.