Siemens SIMATIC ET 200MP Manual page 12

Wiring
Wiring and block diagrams
The figure below shows you how to connect the module and channel addressing
(input byte a to input byte b).
①
Figure 3-1
Resistor circuitry of the encoders
To detect a wire break, it is necessary that enough quiescent current is flowing even
when the encoder contacts are open. Connect a resistor of 25 kΩ to 45 kΩ with 0.25 W
to the encoder contacts for this reason.
Figure 3-2
12
Backplane bus interface
Block diagram and terminal assignment
Resistor circuitry of the encoders
DI 16x24VDC HF Digital Input Module (6ES7521-1BH00-0AB0)
Manual, 01/2013, A5E03485952-01