Siemens SIMATIC ET 200SP User manual

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SIMATIC
ET 200SP
Digital output module
F-DQ 8x24VDC/0.5A PP HF
(6ES7136-6DC00-0CA0)
Manual
05/2017
A5E38578424
-AA
Preface
Documentation guide
1
Product overview
2
Connecting
3
Parameters/address space
4
Applications of the
F-I/O module
5
Interrupts/diagnostic
messages
6
Technical specifications
7
Response times
A
Switching of loads
B
Original operating instructions

Siemens AG
Division Digital Factory
Postfach 48 48
90026 NÜRNBERG
GERMANY
A5E38578424-AA
Ⓟ
05/2017 Subject to change
Copyright © Siemens AG 2017.
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.

Digital output module F-DQ 8x24VDC/0.5A PP HF (6ES7136-6DC00-0CA0)
Manual, 05/2017, A5E38578424-AA 3
Preface
Purpose of the documentation
This manual supplements the system manual Distributed I/O System ET 200SP
(http://support.automation.siemens.com/WW/view/en/58649293).
Functions that affect the system in general are described in this system manual.
The information in this manual and the system/function manuals provide support when you
commission the system.
A description of the F-system SIMATIC Safety can be found in the programming and
operating manual SIMATIC Safety – Configuring and Programming
(http://support.automation.siemens.com/WW/view/en/54110126).
Conventions
CPU: When the term "CPU" is used in the following, it refers to both the CPUs of the
S7-1500 automation system as well CPUs / interface modules of the ET 200SP 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)".
Note the following identified notes:
Note
A
note includes important information on the product described in the documentation, on
handling the product or on the part of the documentation to which you ought to pay special
attention.
Standards
You can find a dated reference to the respective standards in the certificate
(https://support.industry.siemens.com/cs/ww/en/view/57141281) or in the EC Declaration of
Conformity (https://support.industry.siemens.com/cs/ww/en/view/71764057) for the
F-module.

Preface
Digital output module F-DQ 8x24VDC/0.5A PP HF (6ES7136-6DC00-0CA0)
4Manual, 05/2017, A5E38578424-AA
Important note for maintaining the operational safety of your system
Note
The operators of systems with safety
-related characteristics must adhere to specific
operational safety requirements. The supplier is also obliged to comply with special product
monitoring measures. Siemens informs system operators in the form of personal notifications
about product developments and properties which may be or
become important issues in
terms of operational safety.
You should subscribe to the corresponding notifications in order to obtain the latest
information and to allow you to make any necessary modifications to your system.
Log on to Industry Online Suppo
rt. Follow the links below and click on "Email on update" on
the right
-hand side in each case:
•
SIMATIC S7-300/S7-300F
(https://support.industry.siemens.com/cs/products?pnid=13751&lc=en-WW)
•
SIMATIC S7-400/S7-400H/S7-400F/FH
(https://support.industry.siemens.com/cs/products?pnid=13828&lc=en-WW)
•
SIMATIC WinAC RTX (F) (https://support.industry.siemens.com/cs/ww/en/ps/13915)
•
SIMATIC S7-1500/SIMATIC S7-1500F
(https://support.industry.siemens.com/cs/products?pnid=13716&lc=en-WW)
•
SIMATIC S7-1200/SIMATIC S7-1200F
(https://support.industry.siemens.com/cs/products?pnid=13683&lc=en-WW)
•
Distributed I/O (https://support.industry.siemens.com/cs/products?pnid=14029&lc=en-
WW)
•
STEP 7 (TIA Portal)
(https://support.industry.siemens.com/cs/products?pnid=14340&lc=en-WW)
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 only form one element of such a concept.
Customer is responsible to prevent unauthorized access to its plants, systems, machines
and networks. Systems, machines and components should only be connected to the
enterprise network or the internet if and to the extent necessary and with appropriate security
measures (e.g. use of firewalls and network segmentation) in place.
Additionally, Siemens’ guidance on appropriate security measures should be taken into
account. For more information about industrial security, please visit
(http://www.siemens.com/industrialsecurity).
Siemens’ products and solutions undergo continuous development to make them more
secure. Siemens strongly recommends to apply product updates as soon as available and to
always use the latest product versions. Use of product versions that are no longer supported,
and failure to apply latest updates may increase customer’s exposure to cyber threats.
To stay informed about product updates, subscribe to the Siemens Industrial Security RSS
Feed under (http://www.siemens.com/industrialsecurity).

Digital output module F-DQ 8x24VDC/0.5A PP HF (6ES7136-6DC00-0CA0)
5Manual, 05/2017, A5E38578424-AA
Table of contents
Preface ................................................................................................................................................... 3
1 Documentation guide .............................................................................................................................. 7
2 Product overview .................................................................................................................................. 11
2.1 Properties................................................................................................................................11
3 Connecting ........................................................................................................................................... 14
3.1 Wiring and block diagram .......................................................................................................14
4 Parameters/address space ................................................................................................................... 16
4.1 Parameters .............................................................................................................................16
4.2 Explanation of parameters ......................................................................................................18
4.2.1 F-parameters ..........................................................................................................................18
4.2.1.1 F-parameters ..........................................................................................................................18
4.2.1.2 Behavior after channel fault ....................................................................................................18
4.2.1.3 Reintegration after channel fault.............................................................................................18
4.2.2 Parameters of the channels....................................................................................................19
4.2.2.1 Maximum test period...............................................................................................................19
4.2.2.2 Disable dark test for 48 hours.................................................................................................19
4.2.2.3 Activated .................................................................................................................................20
4.2.2.4 Max. readback time dark test..................................................................................................20
4.2.2.5 Max. readback time light test ..................................................................................................22
4.2.2.6 Activated light test...................................................................................................................23
4.2.2.7 Channel failure acknowledge..................................................................................................24
4.3 Address space ........................................................................................................................24
5 Applications of the F-I/O module ........................................................................................................... 26
5.1 Installation of the ground line between the power supply and the BaseUnit ..........................26
5.2 Application: Wiring a load to each digital output.....................................................................27
5.3 Application: Wiring two loads in parallel to each digital output...............................................29
5.4 Application: Connection of a fail-safe digital input to each digital output................................31
5.5 Application: Connection of the ET 200SP digital output module F-RQ
1x24VDC/24..230VAC/5A (6ES7136-6RA00-0BF0) ..............................................................35
6 Interrupts/diagnostic messages............................................................................................................. 37
6.1 Status and error display ..........................................................................................................37
6.2 Interrupts.................................................................................................................................40
6.3 Diagnostics alarms..................................................................................................................42
6.4 Value status ............................................................................................................................46
7 Technical specifications ........................................................................................................................ 47

Table of contents
Digital output module F-DQ 8x24VDC/0.5A PP HF (6ES7136-6DC00-0CA0)
6Manual, 05/2017, A5E38578424-AA
A Response times .................................................................................................................................... 50
B Switching of loads ................................................................................................................................. 51
B.1 Connecting capacitive loads .................................................................................................. 51
B.2 Switching of inductive loads................................................................................................... 53

Digital output module F-DQ 8x24VDC/0.5A PP HF (6ES7136-6DC00-0CA0)
7Manual, 05/2017, A5E38578424-AA
Documentation guide
1
The documentation for the SIMATIC ET 200SP 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 describes in detail the configuration, installation, wiring and
commissioning of the SIMATIC ET 200SP. distributed I/O system. 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.

Documentation guide
Digital output module F-DQ 8x24VDC/0.5A PP HF (6ES7136-6DC00-0CA0)
8Manual, 05/2017, A5E38578424-AA
General information
The function manuals contain detailed descriptions on general topics regarding the SIMATIC
ET 200SP distributed I/O system, e.g. diagnostics, communication, Web server, motion
control and OPC UA.
You can download the documentation free of charge from the Internet
(http://w3.siemens.com/mcms/industrial-automation-systems-simatic/en/manual-
overview/tech-doc-et200/Pages/Default.aspx).
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/73021864).
Manual Collection ET 200SP
The Manual Collection contains the complete documentation on the SIMATIC ET 200SP
distributed I/O system gathered together in one file.
You can find the Manual Collection on the Internet
(http://support.automation.siemens.com/WW/view/en/84133942).
"mySupport"
With "mySupport", your personal workspace, you make the most of your Industry Online
Support.
In "mySupport" you can store filters, favorites and tags, request CAx data and put together
your personal library in the Documentation area. Furthermore, your data is automatically
filled into support requests and you always have an overview of your current requests.
You need to register once to use the full functionality of "mySupport".
You can find "mySupport" in the Internet (https://support.industry.siemens.com/My/ww/en).
"mySupport" - Documentation
In the Documentation area of "mySupport", you have the possibility to combine complete
manuals or parts of them to make your own manual.
You can export the manual in PDF format or in an editable format.
You can find "mySupport" - Documentation in the Internet
(http://support.industry.siemens.com/My/ww/en/documentation).

Documentation guide
Digital output module F-DQ 8x24VDC/0.5A PP HF (6ES7136-6DC00-0CA0)
Manual, 05/2017, A5E38578424-AA 9
"mySupport" - CAx Data
In the CAx Data area of "mySupport", you can have access the latest 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 in the Internet
(http://support.industry.siemens.com/my/ww/en/CAxOnline).
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 in individual products.
You can 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).

Documentation guide
Digital output module F-DQ 8x24VDC/0.5A PP HF (6ES7136-6DC00-0CA0)
10 Manual, 05/2017, A5E38578424-AA
SIMATIC Automation Tool
You can use the SIMATIC Automation Tool to run commissioning and maintenance activities
simultaneously on various SIMATIC S7 stations as a bulk operation independently of the TIA
Portal.
The SIMATIC Automation Tool provides a multitude of functions:
●Scanning of a PROFINET/Ethernet network and identification of all connected CPUs
●Address assignment (IP, subnet, gateway) and station name (PROFINET device) to a
CPU
●Transfer of the data and the programming device/PC time converted to UTC time to the
module
●Program download to CPU
●Operating mode switchover RUN/STOP
●Localization of the CPU by means of LED flashing
●Reading out CPU error information
●Reading the CPU diagnostic buffer
●Reset to factory settings
●Updating the firmware of the CPU and connected modules
You can find the SIMATIC Automation Tool on the Internet
(https://support.industry.siemens.com/cs/ww/en/view/98161300).
PRONETA
With SIEMENS PRONETA (PROFINET network analysis), you analyze the plant network
during commissioning. PRONETA features two core functions:
●The topology overview independently scans PROFINET 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).

Digital output module F-DQ 8x24VDC/0.5A PP HF (6ES7136-6DC00-0CA0)
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Product overview
2
2.1
Properties
Article number
6ES7136-6DC00-0CA0
View of the module
①
Module type and name
⑦
Function class
②
LED for diagnostics
⑧
Color identification module type
③
2D matrix code
⑨
Function and firmware version
④
Connection diagram
⑩
Color code to select the color identification labels
⑤
LEDs for channel status
⑪
Article number
⑥
LED for supply voltage
Figure 2-1 View of the module F-DQ 8x24VDC/0.5A PP HF

Product overview
2.1 Properties
Digital output module F-DQ 8x24VDC/0.5A PP HF (6ES7136-6DC00-0CA0)
12 Manual, 05/2017, A5E38578424-AA
Properties
The module has the following technical characteristics:
●Fail-safe digital module
●PROFIsafe
●Supports the "RIOforFA-Safety“ profile on F-CPUs S7-1200/1500.
●PROFIsafe address type 2
●8 outputs, PP-switching (SIL3/Cat.4/PLe)
●Supply voltage L+
●Output current 0.5 A per output
●Sourcing output (PP-switching)
●Suitable for solenoid valves, DC contactors and signal lamps
●Direct interconnection to inputs of an F-DI possible
●Diagnostics display (DIAG red/green LED)
●Status display for each output (green LED)
●Fault display for each output (red LED)
●Diagnostics
–e.g., short-circuit, channel-specific
–e.g. supply voltage missing, module-specific
●module-wide passivation
The module supports the following functions:
●Firmware update
●I&M identification data
WARNING
The fail-safe performance characteristics in the technical specifications apply for a mission
time of 20 years and a repair time of 100 hours. If a repair within 100 hours is not possible,
remove the respective module from the BaseUnit or switch off its supply voltage before 100
hours expires. The module switches off independently after the 100 hours have expired.
Follow the repair procedure described in section Diagnostics alarms (Page 42).
Note
Cyclic reading of I&M data
Cyclic reading
of I&M data can affect the timing of the F-modules. You should therefore
avoid short read cycles of less than 500 ms.

Product overview
2.1 Properties
Digital output module F-DQ 8x24VDC/0.5A PP HF (6ES7136-6DC00-0CA0)
Manual, 05/2017, A5E38578424-AA 13
Accessories
The following accessory must be ordered separately:
●Labeling strips
●Color identification labels
●Reference identification labels
●Shield connection
●Electronic coding element as spare part
You can find additional information about accessories in the Distributed I/O System
ET 200SP System Manual (http://support.automation.siemens.com/WW/view/en/58649293).
Passivation of fail-safe outputs over a long period of time
WARNING
Unintentional activation of F-I/O with fail-safe outputs
If an F-I/O with fail-safe outputs is passivated for a period longer than that specified in the
safety parameters (> 100 hours) and the fault remains uncorrected, you need to exclude
the possibility that the F-I/O can be activated unintentionally by a second fault, and thus put
the F-system in a dangerous state.
Even though it is highly unlikely that such hardware faults occur, you must prevent the
unintentional activation of F-I/O with fail-safe outputs by using circuit measures or
organizational measures.
One possibility is the shutdown of the power supply of the passivated F-I/O within a time
period of 100 hours, for example.
The required measures are standardized for plants with product standards.
For all other plants, the plant operator must create a concept for the required measures and
have it approved by the inspector.
Property of the individual shutdown of F-modules with fail-safe outputs:
A channel-specific shutdown occurs when a fault is detected. It is also possible to react to
critical process states staggered over time or to perform safety-related shutdown of
individual outputs.

Digital output module F-DQ 8x24VDC/0.5A PP HF (6ES7136-6DC00-0CA0)
Manual, 05/2017, A5E38578424-AA 14
Connecting
3
3.1
Wiring and block diagram
This section provides the block diagram of the F-DQ 8×24VDC/0.5A PP HF F-module with
the terminal assignment.
You can find information about the various connection options and their configuration in the
section Applications of the F-I/O module (Page 26) or Parameters/address space (Page 16).
You can find additional information about wiring BaseUnits in the Distributed I/O System
ET 200SP System Manual (http://support.automation.siemens.com/WW/view/en/58649293).
Note
The load group of the F
-module must begin with a light-colored BaseUnit. Keep this in mind
as well du
ring configuration.
Note
Make sure that you only use the digital output module with BaseUnit type A0 during
commissioning.

Connecting
3.1 Wiring and block diagram
Digital output module F-DQ 8x24VDC/0.5A PP HF (6ES7136-6DC00-0CA0)
Manual, 05/2017, A5E38578424-AA 15
Block diagram
The following figure shows the wiring of the F-DQ 8×24VDC/0.5A PP HF digital output
module on BaseUnit BU type A0 without AUX terminals.
①
Backplane bus interface
Mn
Ground for connection of actuator of channel n.
②
Output electronics P1, P2, AUX Internal self-assembling voltage buses
Connection to the left (dark-colored BaseUnit)
Connection to the left interrupted (light-colored
BaseUnit)
③
Reverse polarity protection DQ-PPnOutput bit n, channel n, PP-switching (sourcing
output)
④
Color-coded label with color code CC02
(optional)
DIAG LED error of diagnostics (green, red)
⑤
Filter circuit supply voltage (available in
light-colored BaseUnit only)
.0 to .7 LED channel status (green)
24 VDC Supply voltage L+ (feed for light-colored
BaseUnit only)
F0 to F7 LED channel error (red)
M
Supply voltage ground
PWR
LED Power (green)
Figure 3-1 Block diagram

Digital output module F-DQ 8x24VDC/0.5A PP HF (6ES7136-6DC00-0CA0)
16 Manual, 05/2017, A5E38578424-AA
Parameters/address space
4
4.1
Parameters
Parameters for F-DQ 8x24VDC/0.5A PP HF
WARNING
Diagnostics functions should be activated or deactivated in accordance with the application,
see section Applications of the F-I/O module (Page 26).
The following parameters are possible:
Table 4- 1 Configurable parameters
Parameters
Value range
Default
Parameter
reassignment in
RUN
Scope
F-parameters:
Manual assignment of F-
monitoring time
•disable
•enable
disabled No Module
F-monitoring time
1 to 65535 ms
150 ms
No
Module
F-source address 1 to 65534 depends on parameter as-
signment of F-CPU
No Module
F-destination address
1 to 65534
suggested by F-system
No
Module
F-parameter signature (with-
out addresses)
0 to 65535 calculated by F-system No Module
Behavior after channel faults •Passivate the entire
module
•Passivate channel
Passivate channel No Module
Reintegration after channel
fault
•Adjustable
•All channels automati-
cally
•All channels manually
(S7-300/400) Adjustable
(S7-1200/1500) All channels
manually
No Module
F-I/O DB manual number
assignment
•disable
•enable
disabled No Module
F-I/O DB number
—
suggested by F-system
No
Module
F-I/O DB name
—
suggested by F-system
No
Module

Parameters/address space
4.1 Parameters
Digital output module F-DQ 8x24VDC/0.5A PP HF (6ES7136-6DC00-0CA0)
Manual, 05/2017, A5E38578424-AA 17
Parameters
Value range
Default
Parameter
reassignment in
RUN
Scope
DQ parameters:
Maximum test period •100 s
•1000 s
1000 s No Module
Disable dark test for 48 hours •disable
•enable
disabled No Module
Channel parameters:
Channel n
Activated •enable enabled No Channel
Max. readback time light test /
dark test
•0.8 / 1.0 ms
•3.0 / 5.0 ms
0.8 / 1.0 ms No Channel
Activated light test •enable enabled No Channel
Channel failure acknowledge •Manual
•Automatic
The value range offered
depends on the F-CPU in
use and on the configuration
of the F-parameter "Reinte-
gration after channel fault".
(S7-300/400) Parameter is
not supported
(S7-1200/1500) Manual
No Channel

Parameters/address space
4.2 Explanation of parameters
Digital output module F-DQ 8x24VDC/0.5A PP HF (6ES7136-6DC00-0CA0)
18 Manual, 05/2017, A5E38578424-AA
4.2
Explanation of parameters
4.2.1
F-parameters
4.2.1.1
F-parameters
You must assign the PROFIsafe address (F-destination address together with F-source
address) to the F-module before you put it into operation.
●You define the F-source address using the "Base for PROFIsafe addresses" parameter in
the F-CPU.
●An F-destination address unique throughout the CPU is automatically assigned for each
F-module. You can manually change the F-destination addresses assigned in the
hardware configuration.
You can find information on F-parameters for the F-monitoring time, the PROFIsafe address
assignment (F-source address, F-destination address) and the F I/O DB in the manual
SIMATIC Safety - Configuring and Programming
(http://support.automation.siemens.com/WW/view/en/54110126).
4.2.1.2
Behavior after channel fault
This parameter is used to specify whether the entire F-module is passivated or just the faulty
channel(s) in the event of channel faults:
●"Passivate the entire module"
●"Passivate channel"
4.2.1.3
Reintegration after channel fault
Use this parameter to select how the channels of the fail-safe module are reintegrated after a
fault.
Use in S7-300/400 F-CPUs
This parameter is always set to "Adjustable" when you use the fail-safe module in S7-
300/400 F-CPUs.
You make the required setting in the F-I/O DB of the fail-safe module.

Parameters/address space
4.2 Explanation of parameters
Digital output module F-DQ 8x24VDC/0.5A PP HF (6ES7136-6DC00-0CA0)
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Use in S7-1500 F-CPUs
When using the fail-safe module in S7-1500 F-CPUs, you set this parameter in the STEP 7
dialog of the fail-safe module:
●"Adjustable"
●"All channels automatically"
●"All channels manually"
If you have set the "Behavior after channel fault" parameter to "Passivate channel", you
enable individual setting of the reintegration type per channel with the parameter assignment
"Adjustable". The reintegration type of the respective channel is specified with the "Channel
failure acknowledge" channel parameter.
If you have set the "Behavior after channel fault" parameter to "Passivate the entire module",
you can only select the same reintegration type for all channels.
4.2.2
Parameters of the channels
4.2.2.1
Maximum test period
With this parameter, you specify the time within which the light, dark tests (complete bit
pattern test) should be performed throughout the module. When this time expires, the tests
are repeated. In case of a fault, the test period is reduced to 60 seconds.
●Use "1000 s", for example, to conserve your actuators.
●Use "100 s" to detect faults more quickly.
4.2.2.2
Disable dark test for 48 hours
This option allows you to suppress the dark test.
To suppress dark test pulses, you must ensure that all channels together carry the 0-signal
once within the 48 hours. If this condition is not fulfilled, all dark test pulses will be applied
anyway on all channels after expiration of this time.
With 0-signal channels, the test pulses of light test continue to occur.
WARNING
When you use the function "Disable dark test for 48 hours", cross-circuits between
channels with 1-signal are not detected.
If an error caused by short-circuits (cross-circuits) is detected when you request the safety
function (shutdown of the output), not only is this output passivated, but all outputs are shut
down and the F-module is passivated.
Also take into consideration the respective requirements of your product standards
regarding error detection time.
When you activate the parameter "Disable dark test for 48 hours", all channels use the
values set for channel 0 for the parameter "Max. readback time light test / dark test".

Parameters/address space
4.2 Explanation of parameters
Digital output module F-DQ 8x24VDC/0.5A PP HF (6ES7136-6DC00-0CA0)
20 Manual, 05/2017, A5E38578424-AA
4.2.2.3
Activated
The channel is always activated for this F-module.
4.2.2.4
Max. readback time dark test
Function
Dark tests are shutdown tests with bit pattern test.
For a dark test, a test signal is switched to the output channel while the output channel has
the 1-signal. This output channel is then briefly disabled (= "dark period") and read back. A
sufficiently slow actuator does not respond to this and remains switched on.
①
Readback
Figure 4-1 Functional principle of the dark test (PP switching)
This parameter allows you to set the time for the readback.
If the expected signals could not be read back correctly after expiration of the readback time
dark test, the output channel is passivated.
No new process values are switched to the output channels while a bit pattern is still active
(switch test is carried out). This means that a higher maximum readback time for the dark
test increases the reaction time of the F-module.
WARNING
Through the configured readback time dark test, short circuits (cross-circuits) to a signal
with a frequency greater than 1/(2 x configured readback time dark test) Hz cannot be
recognized (50:50 sampling ratio).
Short-circuits (cross-circuits) to an output of the same module are recognized.
The parameter also has an effect on the short-circuit detection (cross-circuit) with 1-signal
when the output signal is changed from "1" to "0" with the safety program.