Setting The Rack Number; Fiber Optic Cable For Connecting Two Synchronization Modules - Siemens SIMATIC S7-400H Manual

Synchronization Module

Setting the Rack Number

To be able to differentiate between the two subsystems, the CPU must be able to
output the rack numbers. A CPU has rack number 0 and the others have rack
number 1. Set the rack number to the synchronization module. There is a
miniature slide switch on the module for this and it permits 3 points. The rack
number is applied during POWER ON and a manual memory reset.
The partner module must have different points for the CPU to startup properly, this
means the synchronization module must have the rack number 0 and the other
must have rack number 1. The two synchronization modules in a CPU must have
the same rack number.
Switch Position

Fiber optic cable for connecting two synchronization modules

Length
1M
2M
10M
12-4
The CPU has rack number 1
The CPU has not been assigned a rack number
The CPU has rack number 0
6ES7960-1AA00-5AA0
6ES7960-1AA00-5BA0
6ES7960-1AA00-5KA0
Automation System S7-400H Fault-tolerant Systems
Meaning
Order Number
A5E00068197-07