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SIMATIC
S7-1500/ET 200MP
DI 16x24VDC HF
Digital Input Module
(6ES7521-1BH00-0AB0)
Manual
08/2018
A5E03485952
-AG
Preface
Documentation guide
1
Product overview
2
Wiring
3
Parameters/address space
4
Interrupts/diagnostics alarms
5
Technical specifications
6
Dimensional drawing
A
Parameter data records
B
Page 3
Siemens AG
Division Digital Factory
Postfach 48 48
90026 NÜRNBERG
GERMANY
A5E03485952-AG
Ⓟ
07/2018 Subject to change
Copyright © Siemens AG 2013 - 2018.
All rights reserved
Legal information
Warning notice system
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
avoiding potential hazards when working with these products/systems.
Proper use of Siemens products
Note the following:
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical
documentation. If products and components from other manufacturers are used, these must be recommended
or approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and
maintenance are required to ensure that the products operate safely and without any problems. The permissible
ambient conditions must be complied with. The information in the relevant documentation must be observed.
Trademarks
All names identified by ® are registered trademarks of Siemens AG. The remaining trademarks in this publication
may be trademarks whose use by third parties for their own purposes could violate the rights of the owner.
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.
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Preface
Purpose of the documentation
This manual supplements the S7-1500/ET 200MP
(https://support.industry.siemens.com/cs/ww/en/view/59191792
) system manual.
Functions that relate in general to the systems are described in this system manual.
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 changes:
● Clock synchronization possible in counting mode. In the technical specifications the
counting frequency increased from 1 kHz to 3 kHz.
● New licensing conditions and copyright information of the Open Source Software
● New technical specifications
Conventions
CPU: The term "CPU" is used in this manual both for the CPUs of the S7-1500 automation
system and 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 16x24VDC HF as digital input module with 16 digital inputs (channels 0 to 15).
Counting mode: DI 16x24VDC HF as digital input module with 2 counters (channels 0 and 1)
and 14 digital inputs (channels 2 to 15).
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.
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Preface
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Security information
Siemens provides products and solutions with industrial security functions that support the
secure operation of plants, systems, machines and networks.
In order to protect plants, systems, machines and networks against cyber threats, it is
necessary to implement – and continuously maintain – a holistic, state-of-the-art industrial
security concept. Siemens' products and solutions constitute one element of such a concept.
Customers are responsible for preventing unauthorized access to their plants, systems,
machines and networks. Such systems, machines and components should only be
connected to an enterprise network or the internet if and to the extent such a connection is
necessary and only when appropriate security measures (e.g. firewalls and/or network
segmentation) are in place.
For additional information on industrial security measures that may be implemented, please
visit (https://www.siemens.com/industrialsecurity
).
Siemens' products and solutions undergo continuous development to make them more
secure. Siemens strongly recommends that product updates are applied as soon as they are
available and that the latest product versions are used. Use of product versions that are no
longer supported, and failure to apply the latest updates may increase customers' exposure
to cyber threats.
To stay informed about product updates, subscribe to the Siemens Industrial Security RSS
Feed under (https://www.siemens.com/industrialsecurity
).
Open Source Software
Open-source software is used in the firmware of the I/O modules. 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 license conditions and
copyright notices. Please read the information relating to this on the Internet
(https://support.industry.siemens.com/cs/ww/en/view/109757558
).
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Table of contents
Preface ................................................................................................................................................... 3
1 Documentation guide .............................................................................................................................. 6
2 Product overview .................................................................................................................................. 10
2.1 Properties ................................................................................................................................ 10
2.2 Functions ................................................................................................................................ 13
2.2.1 Count....................................................................................................................................... 13
3 Wiring ................................................................................................................................................... 14
4 Parameters/address space ................................................................................................................... 16
4.1 Parameter ............................................................................................................................... 16
4.1.1 Parameters ............................................................................................................................. 16
4.1.2 Parameters DI mode ............................................................................................................... 17
4.1.3 Explanation of the parameters of the DI mode ....................................................................... 18
4.1.4 Parameters of the Counting mode .......................................................................................... 19
4.1.5 Explanation of the parameters of the Counting mode ............................................................ 20
4.2 Address space ........................................................................................................................ 22
4.2.1 Address space DI mode.......................................................................................................... 23
4.2.2 Address space Counting mode ............................................................................................... 25
4.2.3 Examples of counting.............................................................................................................. 30
5 Interrupts/diagnostics alarms ................................................................................................................. 34
5.1 Status and error displays ........................................................................................................ 34
5.2 Interrupts ................................................................................................................................. 36
5.3 Diagnostics alarms .................................................................................................................. 38
6 Technical specifications ........................................................................................................................ 39
A Dimensional drawing ............................................................................................................................. 43
B Parameter data records......................................................................................................................... 45
B.1 Parameter assignment and structure of the parameter data records ..................................... 45
B.2 Structure of the parameter data records DI mode .................................................................. 47
B.3 Structure of the parameter data records Counting mode ....................................................... 49
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1
The documentation for the SIMATIC S7-1500 automation system and the SIMATIC
ET 200MP distributed I/O system is arranged into three areas.
This arrangement enables you to access the specific content you require.
Basic information
The System Manual and Getting Started describe in detail the configuration, installation,
wiring and commissioning of the SIMATIC S7-1500 and ET 200MP systems. The STEP 7
online help supports you in the configuration and programming.
Device information
Product manuals contain a compact description of the module-specific information, such as
properties, wiring diagrams, characteristics and technical specifications.
General information
The function manuals contain detailed descriptions on general topics regarding the SIMATIC
S7-1500 and ET 200MP systems, e.g. diagnostics, communication, motion control, Web
server, OPC UA.
You can download the documentation free of charge from the Internet
(https://support.industry.siemens.com/cs/ww/en/view/109742691
).
Changes and supplements to the manuals are documented in a Product Information.
You can download the product information free of charge from the Internet
(https://support.industry.siemens.com/cs/us/en/view/68052815
).
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Documentation guide
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7
Manual Collection S7-1500/ET 200MP
The Manual Collection contains the complete documentation on the SIMATIC S7-1500
automation system and the ET 200MP distributed I/O system gathered together in one file.
You can find the Manual Collection on the Internet
(https://support.industry.siemens.com/cs/ww/en/view/86140384
).
SIMATIC S7-1500 comparison list for programming languages
The comparison list contains an overview of which instructions and functions you can use for
which controller families.
You can find the comparison list on the Internet
(https://support.industry.siemens.com/cs/ww/en/view/86630375
).
"mySupport"
With "mySupport", your personal workspace, you make the best out of your Industry Online
Support.
In "mySupport", you can save filters, favorites and tags, request CAx data and compile your
personal library in the Documentation area. In addition, your data is already filled out in
support requests and you can get an overview of your current requests at any time.
You must register once to use the full functionality of "mySupport".
You can find "mySupport" on the Internet (https://support.industry.siemens.com/My/ww/en
).
"mySupport" - Documentation
In the Documentation area in "mySupport" you can combine entire manuals or only parts of
these to your own manual.
You can export the manual as PDF file or in a format that can be edited later.
You can find "mySupport" - Documentation on the Internet
(http://support.industry.siemens.com/My/ww/en/documentation
).
"mySupport" - CAx data
In the CAx data area in "mySupport", you can access the current product data for your CAx
or CAe system.
You configure your own download package with a few clicks.
In doing so you can select:
● Product images, 2D dimension drawings, 3D models, internal circuit diagrams, EPLAN
macro files
● Manuals, characteristics, operating manuals, certificates
● Product master data
You can find "mySupport" - CAx data on the Internet
(http://support.industry.siemens.com/my/ww/en/CAxOnline
).
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Application examples
The application examples support you with various tools and examples for solving your
automation tasks. Solutions are shown in interplay with multiple components in the system separated from the focus on individual products.
You will find the application examples on the Internet
(https://support.industry.siemens.com/sc/ww/en/sc/2054
).
TIA Selection Tool
With the TIA Selection Tool, you can select, configure and order devices for Totally
Integrated Automation (TIA).
This tool is the successor of the SIMATIC Selection Tool and combines the known
configurators for automation technology into one tool.
With the TIA Selection Tool, you can generate a complete order list from your product
selection or product configuration.
You can find the TIA Selection Tool on the Internet
(http://w3.siemens.com/mcms/topics/en/simatic/tia-selection-tool
).
SIMATIC Automation Tool
You can use the SIMATIC Automation Tool to perform commissioning and maintenance
activities simultaneously on various SIMATIC S7 stations as a bulk operation independent of
the TIA Portal.
General function overview:
● Network browsing and creation of a table showing the accessible devices in the network.
● Flashing of device LEDs or HMI display to locate a device
● Downloading of addresses (IP, subnet, gateway) to a device
● Downloading the PROFINET name (station name) to a device
● Placing a CPU in RUN or STOP mode
● Setting the time in a CPU to the current time of your PG/PC
● Downloading a new program to a CPU or an HMI device
● Downloading from CPU, downloading to CPU or deleting recipe data from a CPU
● Downloading from CPU or deleting data log data from a CPU
● Backup/restore of data from/to a backup file for CPUs and HMI devices
● Downloading service data from a CPU
● Reading the diagnostics buffer of a CPU
● Performing a CPU memory reset
● Resetting devices to factory settings
● Downloading a firmware update to a device
You can find the SIMATIC Automation Tool on the Internet
(https://support.industry.siemens.com/cs/ww/en/view/98161300
).
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9
PRONETA
With SIEMENS PRONETA (PROFINET network analysis), you analyze the PROFINET
network during commissioning. PRONETA features two core functions:
● The topology overview independently scans PROFINET network and all connected
components.
● The IO check is a fast test of the wiring and the module configuration of a system.
You can find SIEMENS PRONETA on the Internet
(https://support.industry.siemens.com/cs/ww/en/view/67460624
).
SINETPLAN
SINETPLAN, the Siemens Network Planner, supports you in planning automation systems
and networks based on PROFINET. The tool facilitates professional and predictive
dimensioning of your PROFINET installation as early as in the planning stage. In addition,
SINETPLAN supports you during network optimization and helps you to exploit network
resources optimally and to plan reserves. This helps to prevent problems in commissioning
or failures during productive operation even in advance of a planned operation. This
increases the availability of the production plant and helps improve operational safety.
The advantages at a glance
● Network optimization thanks to port-specific calculation of the network load
● Increased production availability thanks to online scan and verification of existing systems
● Transparency before commissioning through importing and simulation of existing STEP 7
projects
● Efficiency through securing existing investments in the long term and optimal exploitation
of resources
You can find SINETPLAN on the Internet (https://www.siemens.com/sinetplan
).
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2
2.1
Properties
Article number:
6ES7521-1BH00-0AB0
View of the module
Figure 2-1 View of the DI 16x24VDC HF module
Properties
The module has the following technical properties:
● 16 digital inputs; electrically isolated in groups of 16
– of which channel 0 and 1 optionally with counter function
● Rated input voltage 24 V DC
● Configurable input delay: 0.05 ms to 20 ms
● Configurable diagnostics (per channel)
● Configurable hardware interrupt (per channel)
● Suitable for switches and 2-/3-/4-wire proximity switches
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Product overview
2.1 Properties
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The module supports the following functions:
Table 2- 1 Version dependencies of the module functions
Function
Firmware version
of the module
Configuration software
STEP 7
(TIA Portal)
GSD file in STEP 7
(TIA Portal) V12 or higher, or
STEP 7 V5.5 SP3 or higher
Firmware update
V1.0.0 or higher
V12 or higher
--- / X
Identification data I&M0 to I&M3
V1.0.0 or higher
V12 or higher
X
Parameter assignment in RUN V1.0.0 or higher V12 or higher X
Isochronous mode
V1.0.0 or higher
V12 or higher
---
Module-internal Shared Input (MSI) V2.0.0 or higher V13 Update 3 or
higher
(PROFINET IO
only)
X
(PROFINET IO only)
Configurable submodules / submodules for
Shared Device
V2.0.0 or higher V13 Update 3 or
higher
(PROFINET IO
only)
X
(PROFINET IO only)
Channel 0 and 1 optionally with counter func-
tion*
V2.1.0 or higher V13, SP1 with HSP
0118 or higher
X
(PROFINET IO only)
* Requirement for counter function: Inte
rface module IM 155-5 firmware version V3.0 or higher or CPU S7-15XX firmware
version V1.7 or higher
You can configure the module with STEP 7 (TIA Portal) and with a GSD file.
Compatibility
The following table shows the compatibility of the modules and the dependencies between
hardware functional status (FS) and firmware version (FW) used:
Hardware functional status
Firmware version
Note
FS01
V1.0.0 to V2.1.x
Upgrade possible between V1.0.0 to
V2.1.x
Downgrade possible from V2.1.x to V2.1.2
Downgrade possible from V2.1.1 to V1.0.0
FS02 V1.0.0 to V2.1.x
FS03 V2.1.2 to V2.1.x Upgrade to downgrade possible between
V2.1.2 and V2.1.x
FS04 V2.2.0 or higher Upgrade and downgrade possible be-
tween V2.2.0 and higher
Page 13
Product overview
2.1 Properties
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Accessories
The following accessories 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
For more information on accessories, refer to the system manual S7-1500/ET 200MP
(http://support.automation.siemens.com/WW/view/en/59191792
).
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Product overview
2.2 Functions
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2.2
Functions
2.2.1
Count
Introduction
As of firmware version V2.1.0 of the module you have the option of using channels 0 and 1
in the "Count" mode. The other channels can be used as standard inputs (DI mode).
If do not use channels 0 and 1 in the "Count" mode, these channels can also be used as
digital inputs. The two channels 0 and 1 can only be used as counter inputs together.
When counting, the edges of the digital input are acquired and evaluated accordingly e.g.:
● For counting single items up to a maximum limit
● For applications with repeating counting procedures
Reference
You will find the basics and additional information on the counting function in the function
manual Counting, measuring and position detection
(http://support.automation.siemens.com/WW/view/en/59709820
).
Counting with channel 0 and channel 1
You control the counting function via the IO addresses of the module. These IO addresses
are also known as the control interface (output addresses) and feedback interface (input
addresses), see section AUTOHOTSPOT.
If you set the parameters of channels 0 and 1 for counting, you then have the following
options:
● You influence the behavior if one of the counting limits is exceeded using
– Stop counting.
– Continue counting.
● The bit STS_DQ (bit in the feedback interface) signals that the counted value is in one of
the following ranges depending on the parameter assignment:
– Between a comparison value and the high counting limit.
– Between a comparison value and the low counting limit.
● You can set a parameter for a hardware interrupt if a comparison event occurs for DQ.
● You can define counting limits and comparison values for counting from 0 ... 4294967295
(2
32
-1).
● You can set start values or have the user program set load values for counting.
The count direction is only up.
Reference
You will find examples of counting with channels 0 and 1 in the section Examples of counting
(Page 30)
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This section contains the block diagram of the module and outlines various wiring options.
You can find information on wiring the front connector, creating a cable shield, etc. in the
Wiring section of the S7-1500/ET 200MP
(http://support.automation.siemens.com/WW/view/en/59191792
) system manual.
Wiring and block diagram
The figure below shows you how to wire the module and the assignment of the channels to
the addresses (input byte a to input byte b). You can set parameters so that channels 0 and
1 are used for counting. Channels 2 to 15 can continue to be used as digital inputs.
①
Backplane bus interface
CHx
Channel or channel status LED (green/red)
L+
Supply voltage 24 V DC
RUN
Status display LED (green)
M
Ground
ERROR
Error display LED (red)
PWR
POWER supply voltage LED (green)
Figure 3-1 Block diagram and terminal assignment
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Wiring
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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 Resistor circuitry of the encoders
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
Figure 3-3 Using the potential jumpers
Note
Ensure that the maximum current load of 8 A per potential jumper is not exceeded.
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4
4.1
Parameter
4.1.1
Parameters
DI 16x24VDC HF parameters
When you assign the module parameters in STEP 7, you use various parameters to specify
the module properties. The parameters that can be set depend on whether you use the
module in standard mode or in counter mode. You will find the parameters in section
Parameters DI mode (Page 17) or section Parameters of the Counting mode (Page 19). The
effective range of the configurable parameters depends on the type of configuration. The
following configurations are possible:
● Central operation with a S7-1500 CPU
● Distributed operation on PROFINET IO in an ET 200MP system
● Distributed operation on PROFIBUS DP in an ET 200MP system
For parameter assignment in the user program, the parameters are transferred to the
module using the WRREC instruction (parameter reassignment in RUN) and data records;
see chapter Parameter assignment and structure of the parameter data records (Page 45).
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Parameters/address space
4.1 Parameter
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4.1.2
Parameters DI mode
Parameters of the DI 16x24VDC HF in the DI mode
In the table below you will find the parameters in the DI mode. These parameters apply to
channels 0 to 15.
Table 4- 1 Settable parameters and their defaults in the DI mode
Parameter
Range of values
Default setting
Parameter
reassignment
in RUN
Range of effectiveness with con-
figuration software, e.g. STEP 7
Integrated in the
hardware catalog
as of STEP 7,
V13 SP1 or GSD
file
PROFINET IO
GSD file
PROFIBUS DP
Diagnostics
• No
supply voltage L+
Yes/No No Yes Channel* Channel
group**
• Wire break
Yes/No No Yes Channel Channel
group**
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;
for isochronous
mode 0.05 ms
(cannot be
changed)
Yes Channel Channel
group**
Hardware interrupt***
• Rising edge
Yes/No No Yes Channel Channel
• Falling edge
Yes/No No Yes Channel Channel
• Rising and falling edge
Yes/No No Yes Channel Channel
* If you enable diagnostics for multiple channe
ls, 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 enabling diagnostics for one channel only.
** The scope can be assigned for each channel during pa
rameter assignment in RUN.
*** For the configuration as a 4 x 8
-channel module, a maximum of 16 hardware interrupts can be configured (channels 0 to
15).
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Parameters/address space
4.1 Parameter
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4.1.3
Explanation of the parameters of the DI mode
No supply voltage L+
Enabling of the diagnostics, with missing or too little supply voltage L+.
Wire break
Enabling diagnostics if the line to the encoder is interrupted.
Input delay
This parameter can be used to suppress signal disruptions. Changes to the signal are only
detected if they are constantly pending longer than the set input delay time.
Hardware interrupt
Specifies whether or not a hardware interrupt is disabled or with which of the following
events a hardware interrupt is generated.
● Rising edge
● Falling edge
● Rising and falling edge
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Parameters/address space
4.1 Parameter
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19
4.1.4
Parameters of the Counting mode
Parameters of the DI 16x24VDC HF Count in the Counting mode
If you want to use the module for counting, you need to set the module parameters as
DI 16x24VDC HF Count. For channels 0 and channel 1, the following parameter settings are
then possible. For channels 2 to 15, the parameter settings apply as with the
DI 16x24VDC HF, , see section Parameters DI mode (Page 17).
Table 4- 2 Settable parameters and their defaults in the Counting mode
Parameter
Range of values
Default
setting
Parameter
reassignment
in RUN
Range of effectiveness with con-
figuration software, e.g. STEP 7
Integrated in the
hardware catalog
as of STEP 7,
V13 SP1 with
HSP 0118 or
GSD file
PROFINET IO
GSD file
PROFIBUS DP
Diagnostics
• No
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;
for isochronous
mode
0.05 ms
(cannot
be
changed)
Yes Channel ---
Hardware interrupt
• Disable
• Comparison event oc-
curred for DQ
Disable Yes Channel ---
Set output DQ
• Between a comparison
value and the high counting limit
• Between a comparison
value and the low counting limit
Between
a comparison value
and the
high
counting
limit
Yes Channel ---
Edge selection
• On rising edge
• On falling edge
• On rising and falling
edge
On rising
edge
Yes Channel ---
High counting limit
0 ... 4294967295 42949672
95
Yes Channel ---
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Parameters/address space
4.1 Parameter
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20 Manual, 08/2018, A5E03485952-AG
Parameter
Range of values
Default
setting
Parameter
reassignment
in RUN
Range of effectiveness with con-
figuration software, e.g. STEP 7
Integrated in the
hardware catalog
as of STEP 7,
V13 SP1 with
HSP 0118 or
GSD file
PROFINET IO
GSD file
PROFIBUS DP
Comparison value
0 ... 4294967295**
1
Yes
Channel
---
Start value
0 ... 4294967295**
0
Yes
Channel
---
Behavior when a counting limit is exceeded
• Stop counting
• Continue counting
Stop
counter
Yes Channel ---
* If you enable diagno
stics 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 enabling diagnostics for one channel only.
** Comparison value or start value must be less than or equal to the value for the high counting limit.
4.1.5
Explanation of the parameters of the Counting mode
Missing supply voltage L+
Enabling of the diagnostics, with missing or too little supply voltage L+.
Wire break
Enabling diagnostics if the line to the encoder is interrupted.
Input delay
This parameter can be used to suppress signal disruptions. Changes to the signal are only
detected if they are constantly pending longer than the set input delay time.
Hardware interrupt
Specifies whether or not a hardware interrupt is generated by the event "Comparison event
occurred for DQ" (rising edge at STS_DQ).
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Parameters/address space
4.1 Parameter
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Set output DQ
With this parameter, you specify the behavior of the STS_DQ bit in the feedback interface.
You can assign this bit in the user program, for example, with a hardware output, see
AUTOHOTSPOT.
Behavior
Meaning
Between a
comparison value and the high count-
ing limit
STS_DQ bit is set if the following condition is met:
Comparison value < = counted value < = high counting limit
Between a
comparison value and the low counting
limit
STS_DQ bit is set if the following condition is met:
Low counting limit < = counted value < = comparison value
Edge selection
With this parameter you specify which edge is used to count.
You can select the following options:
● On rising edge
● On falling edge
● On rising and falling edge
High counting limit
With this parameter you limit the counting range. You can enter a value up to 4294967295
(2
32
- 1).
Comparison value
With this parameter you specify the count value at which the digital output DQ (STS_DQ bit
of the feedback interface) switches due to the selected comparison event.
Start value
With this parameter, you specify the value at which counting begins and is continued if
defined events occur. The following condition must be met:
Low counting limit < = start value < = high counting limit.
Behavior when a counting limit is exceeded
With this parameter, you specify the behavior if a counting limit is exceeded.
Behavior
Meaning
Stop counting After a counting limit is exceeded, the counting procedure is
aborted and the STS_GATE bit (internal gate) is reset.
To restart the counting, the SW_GATE bit must be reset via
the control interface and set again.
Continue counting
After a counting limit is exceeded, the counted value is set
to the other counting limit and counting is continued.
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Parameters/address space
4.2 Address space
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4.2
Address space
The module can be configured differently in STEP 7; see following table. Depending on the
configuration, additional/different addresses are assigned in the process image of the inputs.
The letters "a to b" are printed onto the module. "EB a" for example, stands for module start
address input byte a.
Configuration options of DI 16x24VDC HF
You can configure the module with STEP 7 (TIA Portal) or with a GSD file.
When you configure the module by means of the GSD file, the configurations are available
under different abbreviations/module names.
The following configurations are possible:
Table 4- 3 Configuration options
Configuration
Short designation/
module name in the
GSD file
Configuration software, e.g., with STEP 7 (TIA Portal)
Integrated in hardware
catalog STEP 7
(TIA Portal)
GSD file in
STEP 7 (TIA Portal) V12 or
higher or STEP 7 V5.5 SP3
or higher
1 x 16-channel without value status
DI 16x24VDC HF
V12 or higher
X
1 x 16-channel with value status
DI 16x24VDC HF QI
V12 or higher
X
2 x 8-channel without value status DI 16x24VDC HF S V13 Update 3 or higher
(PROFINET IO only)
X
(PROFINET IO only)
2 x 8-channel with value status DI 16x24VDC HF S
QI
V13 Update 3 or higher
(PROFINET IO only)
X
(PROFINET IO only)
1 x 16-channel with value status for
module-internal shared input with up to 4
submodules
DI 16x24VDC HF MSI V13 Update 3 or higher
(PROFINET IO only)
X
(PROFINET IO only)
1 x 16-channel with value status (channel
0 and channel 1 for counting, channels 2
to 15 as digital inputs)
DI 16x24VDC HF
Count
V13, SP1 with HSP
0118 or higher
X
(PROFINET IO only)
Value status (Quality Information, QI)
The value status is always activated for the following module names:
● DI 16x24VDC HF QI,
● DI 16x24VDC HF S QI
● DI 16x24VDC HF MSI
● DI 16x24VDC HF Count
An additional bit is assigned to each channel for the value status. The value status bit
indicates if the read in digital value is valid. (0 = value is incorrect).
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Parameters/address space
4.2 Address space
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4.2.1
Address space DI mode
Address space for configuration as 16-channel DI 16x24VDC HF QI
The figure below shows the assignment of the address space for the configuration as a
16-channel module with value status. You can freely assign the start address for the module.
The addresses of the channels are derived from the start address.
Figure 4-1 Address space for configuration as 16-channel DI 16x24VDC HF QI with value status
Address space for configuration as 2 x 8-channel DI 16x24VDC HF S QI
For the configuration as a 2 x 8-channel module, the channels of the module are divided into
multiple submodules. The submodules can be assigned to different IO controllers when the
module is used in a shared device.
The number of usable IO controllers depends on the interface module used. Please observe
the information in the manual for the particular interface module.
Contrary to the 1 x 16-channel module configuration, each of the two submodules has a
freely assignable start address.
Figure 4-2 Address space for configuration as 2 x 8-channel DI 16x24VDC HF S QI
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Parameters/address space
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Address space for configuration as 1 x 16-channel DI 16x24VDC HF MSI
The channels 0 to 15 of the module are copied in up to four submodules with configuration
1 x 16-channel module (Module-internal shared input, MSI). Channels 0 to 15 are then
available with identical input values in different submodules. These submodules can be
assigned to up to four IO controllers when the module is used in a shared device. Each IO
controller has read access to the same channels.
The number of IO controllers depends on the interface module being used. Please observe
the information in the manual for the particular interface module.
Value status (Quality Information, QI)
The meaning of the value status depends on the submodule involved.
For the 1st submodule (= basic submodule), the value status 0 indicates that the value is
incorrect.
For the 2nd to 4th submodule (=MSI submodule), the value status 0 indicates that the value
is incorrect or the basic submodule has not yet been configured (not ready).
The following figure shows the assignment of the address space with submodules 1 and 2
and the value status.
Figure 4-3 Address space for configuration as 1 x 16-channel DI 16x24VDC HF MSI
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Parameters/address space
4.2 Address space
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25
The following figure shows the assignment of the address space with submodules 3 and 4
and the value status.
Figure 4-4 Address space for configuration as 1 x 16-channel DI 16x24VDC HF MSI
Reference
You can find information on the module-internal shared input/shared output (MSI/MSO)
function in the section Module-internal shared input/shared output (MSI/MSO) of the function
manual PROFINET with STEP 7 V13
(http://support.automation.siemens.com/WW/view/en/49948856
).
4.2.2
Address space Counting mode
Address space for configuration as 1 x 16-channel DI 16x24VDC Count
The address space of channel 0 and channel 1 used for counting consists of the control and
feedback interface. The Count function is controlled directly via the two interfaces. With
suitable parameter assignment, a hardware interrupt is triggered.
If you use the module in the "Counting mode" (channels 0 and 1), the module occupies the
following address areas:
● 16 bytes in the process image output (control interface).
● 20 bytes in the process image input (feedback interface).
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4.2 Address space
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Control interface
The figure below shows the address assignment of the module in the process image output.
You use the control interface, for example, to start the counter or to set the counter value.
With the "SW gate" control bit you open and close the software gate of the corresponding
channel.
Figure 4-5 Assignment of the address space of the control interface of the DI 16x24VDC Count
(bytes 0 to 7)
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Figure 4-6 Assignment of the address space of the control interface of the DI 16x24VDC Count
(bytes 8 to 15)
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Feedback interface
The figure below shows the address assignment of the module in the process image input.
The feedback interface for the counters (channels 0 and 1) begins at input byte x+4.
Via the feedback interface, the user program receives current counted values and status
information from the module.
Figure 4-7 Assignment of the address space of the feedback interface of the DI 16x24VDC Count
(bytes 0 to 11)
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Figure 4-8 Assignment of the address space of the feedback interface of the DI 16x24VDC Count
(bytes 12 to 19)
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4.2.3
Examples of counting
In this section, you will find examples of the behavior of the counter and how you can specify
this behavior. You specify the properties of the counter in the parameter assignment.
Behavior when a counting limit is exceeded - Stop counting
The following section describes the effects of the parameter "Behavior when a counting limit
is exceeded = Stop counting". To control the counter, the bits of the control byte of the
control interface are used, see section Address space Counting mode (Page 25)
Counting begins at the current counted value (the SW_GATE is set in the control byte). Bit
sequence in the control byte of the control interface 0000 1000.
After the high counting limit is violated, counting is aborted (counting stops) and the counted
value jumps to the low counting limit = 0. The STS_GATE bit is reset.
To restart the counting, the SW_GATE bit must be reset via the control interface and set
again.
Whether or not counting is started again with the current counter value or with the start value
depends on the command byte in the control interface.
Bit sequence in control byte of the control interface:
● bit 0 to 2 = "000" Start with current counter value
● bit 0 to 2 = "010" Start with start value
If the SW_GATE bit is reset in the control byte of the control interface before reaching the
high counting limit, counting is stopped.
The following figure shows an example of the principle of stopping counting when a counting
limit is exceeded.
Figure 4-9 Principle: Stop counting
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Behavior when a counting limit is exceeded - Continue counting
The following section describes the effects of the parameter "Behavior when a counting limit
is exceeded = Continue counting". To control the counter, the bits of the control byte of the
control interface are used, see section Address space Counting mode (Page 25), subsection
Control interface.
Counting begins at the current counted value (the SW-GATE is set in the control byte). Bit
sequence in the control byte of the control interface 0000 1000.
After the high counting limit is exceeded, the counted value jumps to the low counting limit =
0 and counting is continued.
If the SW_GATE bit is reset in the control byte of the control interface before reaching the
high counting limit, counting is stopped.
The following figure shows an example of the principle of continuing counting when a
counting limit is exceeded.
Figure 4-10 Principle: Continue counting
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Parameters/address space
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Set output DQ - behavior of the STS_DQ bit
The following section shows the behavior of the STS_DQ bit with the parameter assignment
"Set output DQ = between comparison value and high counting limit".
The STS_DQ bit is set to 1
when the comparison value < = counted value <= high counting limit is reached.
As an option, a hardware interrupt can be enabled in the parameter assignment. This is
generated with the parameter rising edge of the STS_DQ bit.
The following figure shows an example of the behavior of the STS_DQ bit between the
comparison value and high counting limit.
Figure 4-11 Behavior of the STS_DQ bit and hardware interrupt
The following section shows the behavior of the STS_DQ bit with the parameter assignment
"Set output DQ = between low counting limit and comparison value".
The STS_DQ bit is set to 1
when the low counting limit < = counted value < = comparison value is reached.
As an option, a hardware interrupt can be enabled in the parameter assignment. This is
generated with the parameter rising edge of the STS_DQ bit.
Page 34
Parameters/address space
4.2 Address space
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33
The following figure shows an example of the behavior of the STS_DQ bit between the low
counting limit and comparison value.
Figure 4-12 Behavior of the STS_DQ bit and hardware interrupt
Counting limits
The counting limits define the range of values of the counted value used. The counting limits
can be set in the parameters and can be changed with the user program during runtime.
Configurable high counting limit: 4294967295 (2
32
-1).
Low counting limit (not settable): 0
You can continue or terminate (automatic gate stop) counting if a counting limit is exceeded,
see the parameter "Behavior when a counting limit is exceeded".
Start value/load value
The start value is specified in the parameter assignment with STEP 7 (TIA Portal). The load
value can be changed by the user program. Both values must be between the low counting
limit and high counting limit.
Comparison values
You specify a comparison value per channel that can control the feedback bit STS_DQ
regardless of the user program. When the current counted value corresponds to the
comparison condition set in the parameters, the feedback bit STS_DQ is set. You can use
the feedback bit STS_DQ to control a digital output of a digital output module.
The comparison values can be set in the parameters and can be changed during runtime via
the user program with parameter data record 0/1.
Gate control
The opening and closing of the software gate (SW-GATE) defines the time window in which
the count signals are acquired. The software gate is controlled by the user program.
Reference
You can find additional information on the counting functionality in the function manual S71500, ET 200MP, ET 200SP counting, measuring and position detection
(http://support.automation.siemens.com/WW/view/en/59709820
).
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34
5
5.1
Status and error displays
LED displays
The following figure shows the LED displays (status and error displays) of DI 16x24VDC HF.
Figure 5-1 LED displays of the DI 16x24VDC HF module
Page 36
Interrupts/diagnostics alarms
5.1 Status and error displays
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35
Meaning of the LED displays
The following tables explain the meaning of the status and error displays. Remedial
measures for diagnostic reports can be found in chapter Diagnostics alarms (Page 38).
RUN and ERROR LED
Table 5- 1 Status and error displays RUN and ERROR
LED
Meaning
Solution
RUN
ERROR
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 whether 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 (at least one
error at one channel, e.g., wire break).
Evaluate the diagnostics data and eliminate the error
(e.g., wire break).
Flashes
Flashes
Hardware defective
Replace the module.
PWR LED
Table 5- 2 PWR status display
LED PWR
Meaning
Solution
Off
Supply voltage L+ too low or missing
Check supply voltage L+.
On
Supply voltage L+ is present and OK ---
CHx LED
Table 5- 3 CHx status display
LED CHx
Meaning
Solution
Off
0 = Status of the input signal
--On
1 = Status of the input signal ---
On
Diagnostics: Wire break
Check the wiring. When using simple switches, deacti-
vate diagnostics or connect a resistor (25 kΩ … 45 kΩ)
to the encoder contacts.
Supply voltage L+ too low or missing
Check supply voltage L+.
Page 37
Interrupts/diagnostics alarms
5.2 Interrupts
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5.2
Interrupts
Digital input module DI 16x24VDC HF supports diagnostic and hardware interrupts.
You can find detailed information on the error event in the error organization block with the
"RALRM" instruction (read additional interrupt info) and in the STEP 7 online help.
Diagnostics interrupt
The module generates a diagnostic interrupt at the following events:
● Missing supply voltage L+
● Wire break
● Parameter assignment error
Hardware interrupt
The module generates a hardware interrupt at the following events:
● Rising edge
● Falling edge
● Rising and falling edge
● Comparison event occurred for DQ (only in "Counting mode")
The module channel that triggered the hardware interrupt is entered in the start information
of the organization block. The following figure shows the assignment to the bits of double
word 8 in local data.
Figure 5-2 Start information of the organization block
Page 38
Interrupts/diagnostics alarms
5.2 Interrupts
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Structure of the additional interrupt information
Table 5- 4 Structure of USI = W#16#0001
Data block name
Contents
Comment
Bytes
USI
(User Structure Identifier)
W#16#0001 Additional interrupt info for hardware interrupts
of the I/O module
2
The channel that triggered the hardware interrupt follows.
Channel
B#16#00 to B#16#0F Number of the event-triggering channel (chan-
nel 0 to channel 15 of the module)
1
It follows the error event that triggered the hardware interrupt.
Event
B#16#01
Rising edge
1
B#16#02
Falling edge
B#16#05 Comparison event occurred for DQ (only in
"Counting mode")
Page 39
Interrupts/diagnostics alarms
5.3 Diagnostics alarms
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5.3
Diagnostics alarms
Diagnostics alarms
A diagnostics alarm is output for each diagnostics event and the ERROR LED flashes on the
module. The diagnostics alarms can, for example, be read from the diagnostics buffer of the
CPU. You can evaluate the error codes with the user program.
If the module is operated distributed with PROFIBUS DP in an ET 200MP system, you have
the option to read out diagnostics data with the instruction RDREC or RD_REC using data
record 0 and 1. The structure of the data records is available on the Internet in the "Manual
for interface module IM 155-5 DP ST (6ES7155-5BA00-0AB0)".
Table 5- 5 Diagnostics alarms, their meaning and corrective measures
Diagnostics alarm
Error code
Meaning
Corrective measures
Wire break* 6H 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
Channel not connected (open)
• Disable diagnostics
• Connect a resistor of 25 kΩ to 45 kΩ
to the encoder contacts
Parameter assignment error
10H
• The module cannot evaluate parame-
ters for the channel
• Incorrect parameter assignment
Correct the parameter assignment
Load voltage missing 11H Supply voltage L+ of the module is miss-
ing
Connect supply voltage L+ to mod-
ule/channel
Hardware interrupt
lost
16H 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
* If the supply voltage fails in case of a pending wire break diagnostics, the value status momentarily indicates an inco
rrect
value.
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6
Technical specifications of the DI 16x24VDC HF
The following table shows the technical specifications as of 08/2018. You will find a data
sheet including daily updated technical specifications on the Internet
(https://support.industry.siemens.com/cs/ww/en/pv/6ES7521-1BH00-0AB0/td?dl=en
).
Article number
6ES7521-1BH00-0AB0
General information
Product type designation
DI 16x24VDC HF
HW functional status
FS04
Firmware version
V2.2.0
• FW update possible
Yes
Product function
• I&M data
Yes; I&M0 to I&M3
Engineering with
• STEP 7 TIA Portal configurable/integrated
as of version
V13 SP1 / -
• STEP 7 configurable/integrated as of ver-
sion
V5.5 SP3 / -
• PROFIBUS as of GSD version/GSD revi-
sion
V1.0 / V5.1
• PROFINET as of GSD version/GSD revi-
sion
V2.3 / -
Operating mode
• DI
Yes
• Counter
Yes
• Oversampling
No
• MSI
Yes
Supply voltage
Rated value (DC)
24 V
permissible range, lower limit (DC)
20.4 V
permissible range, upper limit (DC)
28.8 V
Reverse polarity protection
Yes
Input current
Current consumption, max.
20 mA; with 24 V DC supply
Power
Power available from the backplane bus
1.1 W
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Article number
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Power loss
Power loss, typ.
2.6 W
Digital inputs
Number of digital inputs
16
Digital inputs, parameterizable
Yes
Source/sink input
P-reading
Input characteristic curve in accordance with
IEC 61131, type 3
Yes
Digital input functions, parameterizable
• Gate start/stop
Yes
• Freely usable digital input
Yes
• Counter
– Number, max.
2
– Counting frequency, max.
3 kHz
– Counting width
32 bit
– Counting direction up/down
Up
Input voltage
• Type of input voltage
DC
• Rated value (DC)
24 V
• for signal "0"
-30 to +5V
• for signal "1"
+11 to +30V
Input current
• for signal "1", typ.
2.5 mA
Input delay (for rated value of input voltage)
for standard inputs
– parameterizable
Yes; 0.05 / 0.1 / 0.4 / 1.6 / 3.2 / 12.8 / 20 ms
– at "0" to "1", min.
0.05 ms
– at "0" to "1", max.
20 ms
– at "1" to "0", min.
0.05 ms
– at "1" to "0", max.
20 ms
for interrupt inputs
– parameterizable
Yes
for technological functions
– parameterizable
Yes
Cable length
• shielded, max.
1 000 m
• unshielded, max.
600 m
Page 42
Technical specifications
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41
Article number
6ES7521-1BH00-0AB0
Encoder
Connectable encoders
• 2-wire sensor
Yes
– permissible quiescent current (2-wire
sensor), max.
1.5 mA
Isochronous mode
Isochronous operation (application synchro-
nized up to terminal)
Yes
Filtering and processing time (TCI), min.
80 µs; At 50 μs filter time
Bus cycle time (TDP), min.
250 µs
Interrupts/diagnostics/status information
Diagnostics function
Yes
Alarms
• Diagnostic alarm
Yes
• Hardware interrupt
Yes
Diagnostic messages
• Monitoring the supply voltage
Yes
• Wire-break
Yes; to I < 350 µA
• Short-circuit
No
Diagnostics indication LED
• RUN LED
Yes; Green LED
• ERROR LED
Yes; Red LED
• Monitoring of the supply voltage (PWR-
LED)
Yes; Green LED
• Channel status display
Yes; Green LED
• for channel diagnostics
Yes; Red LED
• for module diagnostics
Yes; Red LED
Potential separation
Potential separation channels
• between the channels
No
• between the channels, in groups of
16
• between the channels and backplane bus
Yes
• between the channels and the power sup-
ply of the electronics
No
Isolation
Isolation tested with
707 V DC (type test)
Page 43
Technical specifications
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Article number
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Ambient conditions
Ambient temperature during operation
• horizontal installation, min.
0 °C
• horizontal installation, max.
60 °C
• vertical installation, min.
0 °C
• vertical installation, max.
40 °C
Decentralized operation
Prioritized startup
Yes
Dimensions
Width
35 mm
Height
147 mm
Depth
129 mm
Weights
Weight, approx.
240 g
Tolerances of the programmable input delay
Table 6- 1 Tolerances of the programmable input delay
Input delay
Tolerance range
0.05 ms
43 μs to 57 μs
0.1 ms
86 μs to 114 μs
0.4 ms
344 μs to 456 μs
1.6 ms
1.5 ms to 1.9 ms
3.2 ms (preset)
3 ms to 4 ms
12.8 ms
12 ms to 15 ms
20 ms
19 ms to 23 ms
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A
The dimensional drawing of the module on the mounting rail, as well as a dimensional
drawing with open front cover, are provided in the appendix. Always observe the specified
dimensions for installation in cabinets, control rooms, etc.
Figure A-1 Dimensional drawing of the DI 16x24VDC HF module
Page 45
Dimensional drawing
DI 16x24VDC HF Digital Input Module (6ES7521-1BH00-0AB0)
44 Manual, 08/2018, A5E03485952-AG
Figure A-2 Dimensional drawing of the DI 16x24VDC HF module, side view with open front cover
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DI 16x24VDC HF Digital Input Module (6ES7521-1BH00-0AB0)
45 Manual, 08/2018, A5E03485952-AG
B
B.1
Parameter assignment and structure of the parameter data records
The data records of the module have an identical structure, regardless of whether you
configure the module with PROFIBUS DP or PROFINET IO.
Dependencies for configuration with GSD file
When configuring the module with a GSD file, remember that the settings of some
parameters are dependent on each other. The parameters are only checked for plausibility
by the module after the transfer to the module.
DI mode:
no dependencies. You can assign the individual parameters in any combination.
Counting mode:
The following table lists the parameters that depend on one another:
Table B- 1 Dependencies of parameters for configuration with GSD file
Device-specific parameters (GSD file)
Dependent parameters
Comparison value 0 ... high counting limit
Start value
0 ... high counting limit
Parameter assignment in the user program
You have the option to reconfigure the module in RUN (e.g. the input delay values of
selected channels can be edited without having an effect on the other channels).
Parameter assignment in RUN
The WRREC instruction is used to transfer the parameters to the module using data records
0 to 15. The parameters set in STEP 7 do not change in the CPU, which means the
parameters set in STEP 7 are still valid after a restart.
The parameters are only checked for plausibility by the module after the transfer.
Output parameter STATUS
The module ignores errors that occurred during the transfer of parameters with the WRREC
instruction and continues operation with the previous parameter assignment. However, a
corresponding error code is written to the STATUS output parameter.
The description of the WRREC instruction and the error codes is available in the STEP 7
online help.
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Parameter data records
B.1 Parameter assignment and structure of the parameter data records
DI 16x24VDC HF Digital Input Module (6ES7521-1BH00-0AB0)
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Operation of the module behind a PROFIBUS DP interface module
If the module is operated behind a PROFIBUS DP interface module, the parameter data
records 0 and 1 are not read back. You get the diagnostics data records 0 and 1 for the read
back parameter data records 0 and 1. You can find more information in the Interrupts section
of the PROFIBUS DP interface module device manual on the Internet
(http://support.automation.siemens.com/WW/view/en/78324181
).
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Parameter data records
B.2 Structure of the parameter data records DI mode
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47
B.2
Structure of the parameter data records DI mode
Assignment of data record and channel
For the configuration with 1 x 16 channels, the parameters are located in data records 0 to
15 and are assigned as follows:
● Data record 0 for channel 0
● Data record 1 for channel 1
● …
● Data record 14 for channel 14
● Data record 15 for channel 15
For the configuration as a 2 x 8-channel module, the module has two submodules with eight
channels each. The parameters for the channels are located in data records 0 to 7 and are
assigned as follows:
● Data records 0 to 7 for channels 0 to 7 (submodule 1)
● Data records 0 to 7 for channels 8 to 15 (submodule 2)
Address the respective submodule for data record transfer.
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Parameter data records
B.2 Structure of the parameter data records DI mode
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Structure of a data record in the DI mode
The example in the figure below shows the structure of data record 0 for channel 0. The
structure of channels 1 to 15 is identical. The values in byte 0 and byte 1 are fixed and may
not be changed.
Enable a parameter by setting the corresponding bit to "1".
Figure B-1 Structure of data record 0: Bytes 0 to 3
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Parameter data records
B.3 Structure of the parameter data records Counting mode
DI 16x24VDC HF Digital Input Module (6ES7521-1BH00-0AB0)
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B.3
Structure of the parameter data records Counting mode
Assignment of data record and channel
For the configuration with 1 x 16 channels, the parameters are located in data records 0 to
15 and are assigned as follows:
● Data record 0 for channel 0 with counting function
● Data record 1 for channel 1 with counting function
● Data record 2 for channel 2 (structure as in DI mode)
● ...
● Data record 14 for channel 14 (structure as in DI mode)
● Data record 15 for channel 15 (structure as in DI mode)
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Parameter data records
B.3 Structure of the parameter data records Counting mode
DI 16x24VDC HF Digital Input Module (6ES7521-1BH00-0AB0)
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Structure of data record 0 of the Counting mode
The example in the figure below shows the structure of data record 0 for channel 0. The
structure of channel 1 is identical, the values are located in data record 1.
The values in byte 0 and byte 1 are fixed and may not be changed.
Enable a parameter by setting the corresponding bit to "1".
Figure B-2 Structure of data record 0: Bytes 0 to 4
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Parameter data records
B.3 Structure of the parameter data records Counting mode
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Figure B-3 Structure of data record 0: Bytes 5 to 17
Keep in mind that the counter is stopped and reset to the start value when you change count
parameters.
Changing the parameters "Diagnostics" and "Hardware interrupts" does not have an effect
on the counter.
Structure of data records 2 to 15
The structure of data records 2 to 15 for channels 2 to 15 is identical to the structure in the
DI mode, see section Structure of the parameter data records DI mode (Page 47), figure
Structure of data record 0: Bytes 0 to 3.
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