Siemens simatic ET 200MP User manual

DI 16x24VDC HF
Digital Input Module
(6ES7521-1BH00- 
0AB0)
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SIMATIC
S7-1500/ET 200MP
DI 16x24VDC HF
Digital Input Module
(6ES7521-1BH00-0AB0)
Manual
01/2013
A5E03485952-01
Preface
Documentation guide
1
Product overview
2
Wiring
3
Parameters/address space
4
Interrupts/diagnostic alarms
5
Technical specifications
6
Dimensional drawing
A
Parameter data records
B

Siemens AG
Industry Sector
Postfach 48 48
90026 NÜRNBERG
GERMANY
A5E03485952-01
Ⓟ 01/2013 Technical data subject to change
Copyright © Siemens AG 2013.
All rights reserved
Legal information
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This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent
damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert
symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are
graded according to the degree of danger.
DANGER
indicates that death or severe personal injury will result if proper precautions are not taken.
WARNING
indicates that death or severe personal injury may result if proper precautions are not taken.
CAUTION
indicates that minor personal injury can result if proper precautions are not taken.
NOTICE
indicates that property damage can result if proper precautions are not taken.
If more than one degree of danger is present, the warning notice representing the highest degree of danger will
be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to
property damage.
Qualified Personnel
The product/system described in this documentation may be operated only by personnel qualified for the specific
task in accordance with the relevant documentation, in particular its warning notices and safety instructions.
Qualified personnel are those who, based on their training and experience, are capable of identifying risks and
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Note the following:
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical
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Disclaimer of Liability
We have reviewed the contents of this publication to ensure consistency with the hardware and software
described. Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the
information in this publication is reviewed regularly and any necessary corrections are included in subsequent
editions.

DI 16x24VDC HF Digital Input Module (6ES7521-1BH00-0AB0)
Manual, 01/2013, A5E03485952-01 3
Preface
Purpose of the documentation
This manual complements the system manuals:
● S7-1500 Automation System
● ET 200MP distributed I/O system
Functions that generally concern the systems are described in these manuals.
The information provided in this manual and in the system/function manuals
support you in commissioning the systems.
Conventions
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.
Please also observe notes marked as follows:
Note
A note contains important information on the product described in the documentation,
on the handling of the product or on the section of the documentation to which particular
attention should be paid.
Note on IT security
Siemens offers IT security mechanisms for its automation and drive product portfolio in order
to support the safe operation of the plant/machine. We recommend that you inform yourself
regularly on the IT security developments regarding your products. You can find information
on this on the Internet (http://support.automation.siemens.com).
You can register for a product-specific newsletter here.
For the safe operation of a plant/machine, however, it is also necessary to integrate the
automation components into an overall IT security concept for the entire plant/machine,
which corresponds to the state-of-the-art IT technology. You can find information on this
on the Internet (http://www.siemens.com/industrialsecurity).
Products used from other manufacturers should also be taken into account here.

Preface
DI 16x24VDC HF Digital Input Module (6ES7521-1BH00-0AB0)
4 Manual, 01/2013, A5E03485952-01
Copyright notice for the open-source software used
Open-source software is used in the firmware of the product described. The open-source
software is provided free of charge. We are liable for the product described, including the
open-source software contained in it, pursuant to the conditions applicable to the product.
Siemens accepts no liability for the use of the open source software over and above the
intended program sequence, or for any faults caused by modifications to the software.
For legal reasons, we are obliged to publish the original text of the following copyright
notices.
© Copyright William E. Kempf 2001
Permission to use, copy, modify, distribute and sell this software and its documentation for
any purpose is hereby granted without fee, provided that the above copyright notice appear
in all copies and that both that copyright notice and this permission notice appear in
supporting documentation. William E. Kempf makes no representations about the suitability
of this software for any purpose. It is provided "as is" without express or implied warranty.
Copyright © 1994 Hewlett-Packard Company
Permission to use, copy, modify, distribute and sell this software and its documentation for
any purpose is hereby granted without fee, provided that the above copyright notice appear
in all copies and that both that copyright notice and this permission notice appear in
supporting documentation. Hewlett-Packard Company makes no representations about the
suitability of this software for any purpose. It is provided ``as is'' without express or implied
warranty.

DI 16x24VDC HF Digital Input Module (6ES7521-1BH00-0AB0)
Manual, 01/2013, A5E03485952-01 5
Table of contents
Preface ...................................................................................................................................................... 3
1 Documentation guide................................................................................................................................. 7
2 Product overview ....................................................................................................................................... 9
2.1 Properties.......................................................................................................................................9
3 Wiring ...................................................................................................................................................... 11
4 Parameters/address space...................................................................................................................... 15
4.1 Parameters...................................................................................................................................15
4.2 Address space .............................................................................................................................16
5 Interrupts/diagnostic alarms..................................................................................................................... 17
5.1 Status and error displays .............................................................................................................17
5.2 Interrupts......................................................................................................................................19
5.3 Diagnostic alarms ........................................................................................................................20
6 Technical specifications........................................................................................................................... 21
A Dimensional drawing ............................................................................................................................... 25
B Parameter data records........................................................................................................................... 27
B.1 Parameter assignment and structure of the parameter data records..........................................27

Table of contents
DI 16x24VDC HF Digital Input Module (6ES7521-1BH00-0AB0)
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DI 16x24VDC HF Digital Input Module (6ES7521-1BH00-0AB0)
Manual, 01/2013, A5E03485952-01 7
Documentation guide 1
Introduction
The documentation of SIMATIC products has a modular structure and covers topics
relating to your automation system.
The complete documentation for the S7-1500 and ET 200MP systems consists
of the respective system manual, function manuals and manuals.
Moreover, the STEP 7 information system (online help) supports you in configuring
and programming your automation system.
Overview of the documentation for digital input module DI 16x24VDC HF
The following table lists additional documentation that you will need when using
the DI 16x24VDC HF digital input module.
Table 1- 1 Documentation for digital input module DI 16x24VDC HF
Topic Documentation Most important contents
S7-1500 Automation System
(http://support.automation.siemens.com/WW/vi
ew/en/59191792) system manual
System
description
ET 200MP Distributed I/O Device
(http://support.automation.siemens.com/WW/vi
ew/en/59193214) system manual
•Application planning
•Installation
•Wiring
•Commissioning
Configuring
interference-free
controllers
Configuring interference-free controllers
(http://support.automation.siemens.com/WW/vi
ew/en/59193566) function manual
•Basics
•Electromagnetic
compatibility
•Lightning protection
System
diagnostics
System Diagnostics
(http://support.automation.siemens.com/WW/vi
ew/en/59192926) function manual
•Overview
•Diagnostic evaluation of
hardware/software
SIMATIC manuals
All current manuals for the SIMATIC products are available for download free of
charge from the Internet (http://www.siemens.com/automation/service&support).

Documentation guide
DI 16x24VDC HF Digital Input Module (6ES7521-1BH00-0AB0)
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DI 16x24VDC HF Digital Input Module (6ES7521-1BH00-0AB0)
Manual, 01/2013, A5E03485952-01 9
Product overview 2
2.1 Properties
Order number:
6ES7521-1BH00-0AB0
View of the module
Figure 2-1 View of the DI 16x24VDC HF module

Product overview
2.1 Properties
DI 16x24VDC HF Digital Input Module (6ES7521-1BH00-0AB0)
10 Manual, 01/2013, A5E03485952-01
Properties
The module has the following properties:
● Technical properties
– 16 digital inputs, electrically isolated in groups of 16
– Rated input voltage 24 V DC
– Channel-based configurable input delay: 0.05 ms to 20 ms
– Channel-based configurable diagnostics
– Channel-based configurable hardware interrupt
– Suitable for switches and 2-/3-/4-wire proximity switches
● Supported functions
– Firmware update
– Identification data I&M0 to I&M3
– Reconfiguration in RUN (channel-based)
– Isochronous mode
Accessories
The following components are supplied with the module and can also
be ordered separately as spare parts:
● Labeling strips
● U connector
● Universal front door
Other components
The following component must be ordered separately:
Front connectors, including potential jumpers and cable ties

DI 16x24VDC HF Digital Input Module (6ES7521-1BH00-0AB0)
Manual, 01/2013, A5E03485952-01 11
Wiring 3
The following figures show the block diagram of the module and various wiring options.
For more information on front connector wiring and creating cable shields,
for example, refer to the "Wiring" section in the S7-1500 Automation System
(http://support.automation.siemens.com/WW/view/en/59191792)
and ET 200MP distributed I/O system
(http://support.automation.siemens.com/WW/view/en/59193214) system manuals.
Abbreviations used
Meaning of the abbreviations used in the following figures:
L+ Supply voltage connection
M Ground connection
CHx Channel or display of the channel status
PWR Display for the supply voltage (POWER)

Wiring
DI 16x24VDC HF Digital Input Module (6ES7521-1BH00-0AB0)
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Wiring and block diagrams
The figure below shows you how to connect the module and channel addressing
(input byte a to input byte b).
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Figure 3-1 Block diagram and terminal assignment
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.
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Figure 3-2 Resistor circuitry of the encoders

Wiring
DI 16x24VDC HF Digital Input Module (6ES7521-1BH00-0AB0)
Manual, 01/2013, A5E03485952-01 13
Tip: Using the potential jumpers
Use the potential jumpers supplied with the front connector if you want to distribute the
24V DC supply voltage to a neighboring module. This helps you to avoid having to
terminate two wires to one terminal.
Proceed as follows:
1. Connect the 24 V DC supply voltage to terminals 19 and 20.
2. Insert the potential jumpers between terminals 19 and 39 (L+)
and between terminals 20 and 40 (M).
3. Use the terminals 39 and 40 to distribute the potential to the next module
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Figure 3-3 Using the potential jumpers
Note
Ensure that the maximum current load of 8 A per potential jumper is not exceeded!

Wiring
DI 16x24VDC HF Digital Input Module (6ES7521-1BH00-0AB0)
14 Manual, 01/2013, A5E03485952-01

DI 16x24VDC HF Digital Input Module (6ES7521-1BH00-0AB0)
Manual, 01/2013, A5E03485952-01 15
Parameters/address space 4
4.1 Parameters
DI 16x24VDC HF parameters
When assigning the module parameters in STEP 7, use different parameters
to declare the module properties. The following table lists the configurable parameters.
When assigning parameters in the user program, use the WRREC instruction
(configuration in RUN) to transfer the parameters to the module using data records;
refer to section Parameter assignment and structure of the parameter data records
(Page 27).
Table 4- 1 Configurable parameters and their defaults
Parameters Range of values Default Configuration in
RUN
Effective range
Diagnostics
•Missing supply voltage L+ Yes/No No Yes Channel*
•Wire break Yes/No No Yes Channel
Input delay 0.05 ms, 0.1 ms,
0.4 ms, 1.6 ms,
3.2 ms, 12.8 ms,
20 ms
3.2 ms Yes Channel
Hardware interrupt
•Positive edge Yes/No No Yes Channel
•Negative edge Yes/No No Yes Channel
•Positive and negative edge Yes/No No Yes Channel
* If you enable diagnostics for multiple channels, you will receive an alarm surge on failure of the supply voltage because
each enabled channel will detect this fault.
You can prevent this alarm surge by assigning the diagnostics function to one channel only.

Parameters/address space
4.2 Address space
DI 16x24VDC HF Digital Input Module (6ES7521-1BH00-0AB0)
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4.2 Address space
Address space of DI 16x24VDC HF
The following figure shows the address space allocation for the configuration as 16-channel
DI 16x24VDC HF with value status (Quality Information (QI)). The addresses for the value
status are only available if the value status is enabled.
The letters "a" and "b" are printed on the module. "IB a" represents the module start address.
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Figure 4-1 Address space of DI 16x24VDC HF with value status
Configuration options of DI 16x24VDC HF
The following configurations are possible:
● Configuration 1: 1 x 16-channel (no value status)
● Configuration 2: 1 x 16-channel (with value status)
Evaluating the value status
An additional two bytes are allocated in the input address space if you enable the value
status for the digital module. Each bit in this byte is assigned to a channel and returns
information about the validity of the digital value (0 = incorrect value).

DI 16x24VDC HF Digital Input Module (6ES7521-1BH00-0AB0)
Manual, 01/2013, A5E03485952-01 17
Interrupts/diagnostic alarms 5
5.1 Status and error displays
LED displays
The following figure shows you the LED displays (status and error displays)
of DI 16x24VDC HF.
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Interrupts/diagnostic alarms
5.1 Status and error displays
DI 16x24VDC HF Digital Input Module (6ES7521-1BH00-0AB0)
18 Manual, 01/2013, A5E03485952-01
Meaning of the LED displays
The following tables explain the meaning of the status and error displays. Corrective
measures for diagnostic alarms can be found in chapter Diagnostic alarms (Page 20).
Table 5- 1 Status and error displays RUN/ERROR
LED
RUN ERROR
Meaning To correct or avoid errors
Off Off
Voltage missing or too low at backplane bus
•Switch on the CPU and/or the system
power supply modules.
•Verify that the U connectors are inserted.
•Check to see if too many modules are
inserted.
Flashes
Off
The module starts and flashes until the valid
parameter assignment is set.
On Off
Module is configured
---
On
Flashes
Indicates module errors (there is an error on at
least one channel, for example, a wire break).
Evaluate the diagnostics data and eliminate
the error (e.g., wire break).
Flashes Flashes
Hardware defective Replace the module.
Table 5- 2 PWR status display
LED PWR Meaning To correct or avoid errors
Off
Supply voltage L+ too low or missing Check supply voltage L+.
On
Supply voltage L+ is present and OK ---
Table 5- 3 CHx status display
LED CHx Meaning To correct or avoid errors
Off
0 = Status of the input signal ---
On
1 = Status of the input signal ---
Diagnostics: Wire break Check the wiring. When using simple switches,
deactivate diagnostics or connect a resistor
(25 kΩ … 45 kΩ) to the encoder contacts.
On
Supply voltage L+ too low or missing Check supply voltage L+.

Interrupts/diagnostic alarms
5.2 Interrupts
DI 16x24VDC HF Digital Input Module (6ES7521-1BH00-0AB0)
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5.2 Interrupts
Digital input module DI 16x24VDC HF supports diagnostic and hardware interrupts.
Diagnostic interrupt
The module generates a diagnostic interrupt at the following events:
● Missing supply voltage L+
● Wire break
Hardware interrupt
The module generates a hardware interrupt at the following events:
● Positive edge
● Negative edge
● Positive and negative edge
For detailed information on the error event, refer to the hardware interrupt organization block
with the "RALRM" instruction (read additional interrupt information) and to the STEP 7 online
help.

Interrupts/diagnostic alarms
5.3 Diagnostic alarms
DI 16x24VDC HF Digital Input Module (6ES7521-1BH00-0AB0)
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5.3 Diagnostic alarms
Diagnostic alarms
A diagnostic alarm is output for each diagnostic event and the ERROR LED flashes on the
module. The diagnostic alarms can, for example, be read from the diagnostic buffer of the
CPU. You can evaluate the error codes with the user program.
Table 5- 4 Diagnostic alarms, their meaning and corrective measures
Diagnostic alarm Error code Meaning Corrective measures
Load voltage missing 17D Supply voltage L+ of the module is
missing
Connect supply voltage L+ to
module/channel
Impedance of encoder circuit too high Use a different encoder type or modify
the wiring, for example, using cables with
larger cross-section
Wire break between the module and
sensor
Connect the cable
Wire break 6D
Channel not connected (open) •Disable diagnostics
•Connect a resistor of 25 kΩ to 45 kΩ
to the encoder contacts
Hardware interrupt
lost
22D The module cannot trigger an interrupt
because the previous interrupt was not
acknowledged; possibly a configuration
error
•Change interrupt processing in the
CPU and, if necessary, edit the
module parameters.
•The error persists until the module
is assigned new parameters