Siemens ET 200S Manual page 290

Digital Electronic Modules
11.4 4DI 24 VDC/SRC Standard Digital Electronic Module
(6ES7 131-4BD50-0AA0)
Order Number
6ES7 131-4BD50-0AA0
Features
S Digital electronic module with four inputs
S Source input
S Rated input voltage 24 VDC
S Suitable for switches and proximity switches (BEROs)
11-14
Distributed I/O System ET 200S
EWA 4NEB 780 6024-02 07