Using Single-Channel, Switched I/O; What Is Single-Channel, Switched I/O? - Siemens SIMATIC S7-400H Manual

7.3

Using Single-Channel, Switched I/O

What is 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 single mode, the master subsystem can always address all switched I/O (as
opposed to one-way I/O).
The single-channel, switched I/O configuration is possible with the ET 200M
distributed I/O device equipped with an active backplane bus and a redundant
PROFIBUS-DP slave interface module IM 153-2 or IM 153-2FO (permissible
IM 153-2: 6ES7 153-2AA02-0XB0 version 7 or later; permissible IM 153-2FO:
6ES7 153-2AB01-0XB0 version 6 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).
PROFIBUS PA can be connected to a redundant system using DP/PA-Link
(permissible IM 157: 6ES7 157-0AA82-0XA0).
A single-channel DP master system can be connected to a redundant system
using a Y-coupler. The following combinations of IM 157 and Y-couplers are
permissible:
6ES7 157-0AA82-0XA0
The single-channel, switched I/O configuration is recommended for devices that
tolerate the failure of individual modules within the ET 200M.
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
IM 157
Using I/O on the S7-400H
Y-coupler
6ES7 197-1LB00-0XA0
7-5