Siemens SIMATIC S7-400H User Manual

Single Operation
B-2
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
What do you have to take into account for single Operation of a fault-tolerant
CPU
Notice
Synchronization submodules must not be inserted when a fault-tolerant CPU is
used in single operation.
Compared to a standard S7-400 CPU, a fault-tolerant CPU has additional
functions, but it does not support certain other functions. You must therefore know
on which CPU your user program should run, especially when you are
programming your programmable logic controller. A user program that you have
written for a standard S7-400 CPU will therefore not normally run on a fault-tolerant
CPU in single operation without adjustments.
The following table lists the differences between the operation of a standard
S7-400 CPU and the single operation and redundant operation of a fault-tolerant
CPU.
Table B-1 Differences between S7-400 and S7-400H
Function
Standard S7-400 CPU H-CPU in single
operation
H-CPU
redundantsystem
mode
Use of symbol-oriented
messages (SCAN)
Yes No No
Multicomputing (OB60,
SFC35)
Yes No No
Startup without
configuration loaded
Yes, if no IMs, no CPs
and FMs are plugged
in and no expansion
units are connected
No No
Insertion of DP modules in
the module slots for
interface modules
Yes No. The module slots
are only intended for
the synchronization
submodules.
No. The module slots
are only intended for
the synchronization
submodules.
Connection of S5 modules
via IM or adapter casings
Yes beginning with firmware
version 3.1 through IM
463-2
No
A high-quality RAM test
after POWER ON
No Yes Yes
Self-test in RUN No Yes Yes
Redundancy error OBs
(OB70, OB72)
No Yes, but no calls Yes
Redundancy error OBs
(OB70, OB72)
No
Yes, but no calls
Yes
Background processing
(OB90)
Yes No No
Restart (OB101) Yes No No

Siemens SIMATIC S7-400H Specifications

General

Brand	Siemens
Model	SIMATIC S7-400H
Category	Control Unit
Language	English