Using Single-Channel, Switched I/O - Siemens SIMATIC S7-400H Manual

6.3

Using Single-Channel, Switched I/O

What is a single-channel, switched I/O?
With the single-channel, switched configuration single input/output modules are
present (single-channel).
In Redundant mode they may be addressed by both subsystems.
In Solo mode, the master subsystem can always address all switched I/O (as
opposed to one-way I/O). The non-master subsystem cannot address switched
I/O.
The single-channel, switched I/O configuration is possible with the ET 200M
distributed I/O device having an active backplane bus and a redundant
PROFIBUS-DP slave interface module IM 153-2 or IM 153-2FO (permitted
IM 153-2: 6ES7 153-2AA02-0XB0 version 6 or later; permitted IM 153-2FO:
6ES7 153-2AB01-0XB0 version 5 or later). Each subsystem of the S7-400H is
connected to one of the two DP slave interfaces of the ET 200M (via a DP master
interface).
In addition, DP/PA coupler IM 157 allows a redundant connection to PROFIBUS
PQ (permitted IM 157: 6ES7 157-0AA81-0XA0 version 1 or later and firmware
version 3.1.0).
The single-channel, switched I/O configuration is recommended for devices that
tolerate the failure of individual modules within the ET 200M.
S7-400H Programmable Controller Fault-Tolerant Systems
A5E00068197-04
Using I/O on the S7-400H
6-5