Siemens SIMATIC ET 200SP Manual page 27

Block diagrams
You must ground the shields of the cables between encoder and technology module both
through the shield terminal on the BaseUnit (shield bracket and terminal) and also on the
encoder.
The figure below shows the block diagram of the technology module with one connected
RS422 incremental encoder.
①
②
③
④
⑤
⑥
Image 3-1
Technology module TM PosInput 1 (6ES7138-6BA00-0BA0)
Manual, 04/2016, A5E33015755-AC
Electrical isolation
Shield connection on the BaseUnit
Technology
Backplane bus interface module of the technology module
Backplane bus
Input filter
Block diagram with RS422 incremental encoder
Wiring
3.1 Pin assignment
27