Specifications

DI 32x24VDC HF digital input module (6ES7521-1BL00-0AB0)

Manual, 04/2015, A5E03485935-AE

Wiring

This section contains the block diagram of the module and outlines various wiring options.

You will find information on wiring the front connector, establishing a cable shield, etc in the

system manual S7-1500/ET 200MP

(http://support.automation.siemens.com/WW/view/en/59191792) in section Wiring.

Wiring and block diagram

The figure below shows how to wire the module and assign channel addresses (input byte a

up to input byte d). You can set parameters so that channels 0 and 1 are used for counting.

Channels 2 to 31 can continue to be used as digital inputs.

①

Backplane bus interface

CHx

Channel or LED channel status (green)

xL+

Power supply 24 V DC for relay contacts

RUN

LED status display (green)

Ground

ERROR

LED error display (red)

PWR

LED supply voltage POWER (green)

Figure 3-1 Block diagram and terminal assignment