Specifications

DI 32x24VDC HF digital input module (6ES7521-1BL00-0AB0)
4 Manual, 04/2015, A5E03485935-AE
Preface
Purpose of the documentation
This manual supplements the system manual for the S7-1500, ET 200MP.
Functions that relate in general to the systems are described in these system manuals.
The information provided in this manual and in the system/function manuals supports you in
commissioning the systems.
Changes compared to previous version
Compared to the previous version, this manual contains the following change:
As an option, channel 0 and channel 1 can be used for counting as of firmware version
V2.1.0 of the module
If channels 0 and 1 are used for counting, channels 2 to 31 can continue to be used as
digital inputs.
Conventions
CPU: The term "CPU" is used in this manual both for the CPUs of the S7-1500 automation
system, as well as for interface modules of the ET 200MP distributed I/O system.
STEP 7: In this documentation, "STEP 7" is used as a synonym for all versions of the
configuration and programming software "STEP 7 (TIA Portal)".
DI mode: DI 32x24VDC HF as digital input module with 32 digital inputs (channels 0 to 31).
Counting mode: DI 32x24VDC HF as digital input module with 2 counters (channels 0 and 1)
and 30 digital inputs (channels 2 to 31).
Please also observe notes marked as follows:
Note
A note contains important information regarding the product described in the documentation
or its handling, or draws special attention to a section of the
documentation.