Siemens SIMATIC ET 200M Operating Instructions Manual page 66

Installation
4.2 Installation
Sequence when hanging the modules
Hang the modules onto the rail as follows:
1. Power supply module
2. IM 153-x
3. Signal module(s)
Note
If you are installing SM 331 analog input modules, please check before installation
whether you have to move the measuring range submodules on the side of the module.
(Refer to chapter "Analog modules" in the "S7-300 automation system, module
specifications (http://support.automation.siemens.com/WW/view/en/8859629)" reference
manual.)
Sequence for Installation
Proceed as follows to install the modules:
Table 4- 3 Installing modules on mounting rails
Step Activity
1. Hook the power supply unit PS 307 onto the rail
and screw it tight.
2. Clip on the bus connector.
A bus connector is included with each signal
module, but not however with the IM 153-x. When
installing the bus connector always start with the IM
153-x:
Take the bus connector from the "last" module
•
and insert it in the IM 153-x.
Do not plug a bus connector into the "last"
•
module.
Do not insert any bus connectors between the PS
307 and IM 153-x!
64
Figure
Operating Instructions, 12/2008, EWA-4NEB780600602-08
ET 200M