Siemens SIMATIC ET 200SP User manual

Technology Module TM Pulse 2x24V (6ES7138-6DB00-
0BB1)

SIMATIC
ET 200SP
Technology Module
TM Pulse 2x24V
(6ES7138‑6DB00‑0BB1)
Manual
05/2019
A5E35061186
-AB
Preface
Documentation guide
1
Product overview
2
Connecting
3
Configuring/address space
4
Interrupts/diagnostic
messages
5
Technical specifications
6
Parameter data record
A
Flow chart: Handling of the
SLOT parameters
B

Siemens AG
Division Digital Factory
Postfach 48 48
90026 NÜRNBERG
GERMANY
A5E35061186-AB
Ⓟ
05/2019 Subject to change
Copyright © Siemens AG 2019.
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.

Technology Module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
Manual, 05/2019, A5E35061186-AB 3
Preface
Purpose of the documentation
This manual contains module-specific information on the wiring, the diagnostics and the
technical specifications of the technology module.
You can find information that pertains generally to the configuration and commissioning of
the ET 200SP in the ET 200SP system manual.
Conventions
Observe the notes that are indicated as follows:
Note
A note contains important information regarding the product described in the documentation,
the handling of the product or the part of the documentation to which particular attention
should be paid.
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.
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 (http://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 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).

Preface
Technology Module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
4Manual, 05/2019, A5E35061186-AB
Open Source Software
Open source software is used in the firmware of the described product. The open source
software is provided free of charge. We are liable for the described product, including the
open source software contained therein, pursuant to the conditions applicable to the product.
Any liability for use of the open source software beyond the program flow we intended for the
product is explicitly excluded. Furthermore, any liability for defects caused by modifications
to the software is excluded.
For legal reasons, we are obliged to publish the original text of the license conditions and
copyright notices. Please read the information on this on the Internet
(https://support.industry.siemens.com/cs/ww/en/view/109740777).

Technology Module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
Manual, 05/2019, A5E35061186-AB 5
Table of contents
Preface ...................................................................................................................................................... 3
1 Documentation guide................................................................................................................................. 8
2 Product overview ..................................................................................................................................... 12
2.1 Properties................................................................................................................................12
2.2 Operating modes ....................................................................................................................14
3 Connecting .............................................................................................................................................. 15
3.1 Terminal assignment and schematic circuit diagram..............................................................15
4 Configuring/address space ...................................................................................................................... 21
4.1 Pulse output (single pulse) mode ...........................................................................................21
4.1.1 Function ..................................................................................................................................21
4.1.1.1 Introduction .............................................................................................................................21
4.1.1.2 Output sequence.....................................................................................................................21
4.1.1.3 Pulse duration.........................................................................................................................23
4.1.1.4 On delay..................................................................................................................................23
4.1.1.5 Sequence counter...................................................................................................................24
4.1.1.6 High-speed output...................................................................................................................24
4.1.2 Configuring..............................................................................................................................25
4.1.3 Reaction to CPU STOP ..........................................................................................................26
4.1.4 Parameter setting....................................................................................................................27
4.1.5 Address space ........................................................................................................................29
4.1.6 Control and feedback interface...............................................................................................29
4.1.6.1 Assignment of the control interface ........................................................................................29
4.1.6.2 Assignment of the feedback interface.....................................................................................32
4.1.7 Isochronous mode ..................................................................................................................33
4.2 Pulse width modulation PWM mode.......................................................................................34
4.2.1 Function ..................................................................................................................................34
4.2.1.1 Introduction .............................................................................................................................34
4.2.1.2 Output sequence.....................................................................................................................34
4.2.1.3 Duty cycle ...............................................................................................................................36
4.2.1.4 Period duration........................................................................................................................37
4.2.1.5 On delay..................................................................................................................................38
4.2.1.6 Dithering..................................................................................................................................39
4.2.1.7 Current measurement/control.................................................................................................44
4.2.1.8 Minimum pulse duration and minimum interpulse period .......................................................47
4.2.1.9 High-speed output...................................................................................................................48
4.2.2 Configuring..............................................................................................................................49
4.2.3 Reaction to CPU STOP ..........................................................................................................51
4.2.4 Parameter setting....................................................................................................................52
4.2.5 Address space ........................................................................................................................55

Table of contents
Technology Module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
6Manual, 05/2019, A5E35061186-AB
4.2.6 Control interface and feedback interface............................................................................... 55
4.2.6.1 Assignment of the control interface........................................................................................ 55
4.2.6.2 Assignment of the feedback interface.................................................................................... 58
4.2.7 Isochronous mode ................................................................................................................. 61
4.3 Pulse train mode .................................................................................................................... 63
4.3.1 Function ................................................................................................................................. 63
4.3.1.1 Introduction ............................................................................................................................ 63
4.3.1.2 Number of pulses................................................................................................................... 65
4.3.1.3 Duty cycle............................................................................................................................... 65
4.3.1.4 Period duration....................................................................................................................... 66
4.3.1.5 On delay................................................................................................................................. 66
4.3.1.6 Current measurement ............................................................................................................ 67
4.3.1.7 High-speed output.................................................................................................................. 67
4.3.2 Configuring............................................................................................................................. 68
4.3.3 Reaction to CPU STOP ......................................................................................................... 69
4.3.4 Parameter setting................................................................................................................... 70
4.3.5 Address space ....................................................................................................................... 73
4.3.6 Control interface and feedback interface............................................................................... 73
4.3.6.1 Assignment of the control interface........................................................................................ 73
4.3.6.2 Assignment of the feedback interface.................................................................................... 76
4.3.7 Isochronous mode ................................................................................................................. 78
4.4 On/Off delay mode................................................................................................................. 79
4.4.1 Function ................................................................................................................................. 79
4.4.1.1 Introduction ............................................................................................................................ 79
4.4.1.2 Output sequence.................................................................................................................... 79
4.4.1.3 On delay................................................................................................................................. 83
4.4.1.4 Off delay................................................................................................................................. 83
4.4.1.5 High-speed output.................................................................................................................. 84
4.4.2 Configuring............................................................................................................................. 85
4.4.3 Reaction to CPU STOP ......................................................................................................... 86
4.4.4 Parameter setting................................................................................................................... 87
4.4.5 Address space ....................................................................................................................... 89
4.4.6 Control interface and feedback interface............................................................................... 89
4.4.6.1 Assignment of the control interface........................................................................................ 89
4.4.6.2 Assignment of the feedback interface.................................................................................... 92
4.4.7 Isochronous mode ................................................................................................................. 94
4.5 Frequency output mode ......................................................................................................... 95
4.5.1 Function ................................................................................................................................. 95
4.5.1.1 Introduction ............................................................................................................................ 95
4.5.1.2 Frequency .............................................................................................................................. 97
4.5.1.3 On delay................................................................................................................................. 97
4.5.1.4 High-speed output.................................................................................................................. 98
4.5.2 Configuring............................................................................................................................. 99
4.5.3 Reaction to CPU STOP ....................................................................................................... 100
4.5.4 Parameter setting................................................................................................................. 101
4.5.5 Address space ..................................................................................................................... 103
4.5.6 Control interface and feedback interface............................................................................. 103
4.5.6.1 Assignment of the control interface...................................................................................... 103
4.5.6.2 Assignment of the feedback interface.................................................................................. 106
4.5.7 Isochronous mode ............................................................................................................... 107

Table of contents
Technology Module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
Manual, 05/2019, A5E35061186-AB 7
4.6 PWM with DC motor motor ...................................................................................................108
4.6.1 Function ................................................................................................................................108
4.6.1.1 Introduction ...........................................................................................................................108
4.6.1.2 Duty cycle .............................................................................................................................111
4.6.1.3 Period duration......................................................................................................................111
4.6.1.4 On delay................................................................................................................................112
4.6.2 Configuring............................................................................................................................113
4.6.3 Parameter setting..................................................................................................................115
4.6.4 Address space ......................................................................................................................117
4.6.5 Control interface and feedback interface..............................................................................117
4.6.5.1 Assignment of the control interface ......................................................................................117
4.6.5.2 Assignment of the feedback interface...................................................................................120
4.6.6 Isochronous mode ................................................................................................................122
4.7 Parallel connection of channels............................................................................................124
4.8 Direct control of digital outputs .............................................................................................126
4.9 Explanation of parameters....................................................................................................128
4.9.1 Channel configuration...........................................................................................................128
4.9.2 Operating mode ....................................................................................................................129
4.9.3 Reaction to CPU STOP ........................................................................................................131
4.9.4 Diagnostics ...........................................................................................................................132
4.9.5 Parameter .............................................................................................................................133
4.10 Handling of the SLOT parameters........................................................................................139
5 Interrupts/diagnostic messages ............................................................................................................. 143
5.1 Status and error displays ......................................................................................................143
5.2 Diagnostic messages............................................................................................................145
6 Technical specifications......................................................................................................................... 148
A Parameter data record........................................................................................................................... 155
A.1 Parameter assignment and structure of the parameter data record.....................................155
A.2 Parameter validation errors ..................................................................................................167
B Flow chart: Handling of the SLOT parameters....................................................................................... 170
Index...................................................................................................................................................... 171

Technology Module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
8Manual, 05/2019, A5E35061186-AB
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.
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
(https://support.industry.siemens.com/cs/ww/en/view/109742709).
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/ww/en/view/73021864).

Documentation guide
Technology Module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
Manual, 05/2019, A5E35061186-AB 9
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
(https://support.industry.siemens.com/cs/ww/en/view/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).
"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).

Documentation guide
Technology Module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
10 Manual, 05/2019, A5E35061186-AB
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 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).

Documentation guide
Technology Module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
Manual, 05/2019, A5E35061186-AB 11
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).

Technology Module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
12 Manual, 05/2019, A5E35061186-AB
Product overview
2
2.1 Properties
Article number
6ES7138-6DB00-0BB1
View of the module
①
Module type and designa-
tion
⑦
LED for supply voltage
②
LED for diagnostics
⑧
Function class
③
2D matrix code
⑨
Module type color coding
④
Terminal diagram
⑩
Function and firmware version
⑤
LEDs for channel status
⑪
Color code for selection of the color-coded labels and BaseUnit
type
⑥
LED for sensor supply
⑫
Article number
Figure 2-1 View of the TM Pulse 2x24V module as an example

Product overview
2.1 Properties
Technology Module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
Manual, 05/2019, A5E35061186-AB 13
Properties
The TM Pulse 2x24V technology module has the following technical properties:
●2 channels with up to 2 A output current per channel
●Parallel connection of channels: Enables one logical channel with up to 4 A output current
(one-channel operation)
●High-speed output: Choice of high output frequency up to 100 kHz with output current of
0.1 A or higher current of 2 A / 4 A with frequency up to 10 kHz
●Interfaces (per channel):
–24 V sensor supply, short-circuit proof
–Digital input signal DI0
–Bipolar digital output signal DQA / DQB for DC motor
●Channel-by-channel monitoring for short-circuit and incorrect supply voltage
●Configurable input filters for suppression of interference at digital inputs
●Use of SW or HW enable to start the output sequence
Supported system functions
●Isochronous mode
●Firmware update
●I&M identification data
●Parameter reassignment in RUN
Accessories
A BaseUnit of type B1is needed for operation of the technology module. You will find an
overview of the BaseUnits you can use with the technology module in Product information on
the documentation of the ET 200SP distributed I/O system
(http://support.automation.siemens.com/WW/view/en/73021864).
You can find additional information on accessories in the ET 200SP Distributed I/O System
system manual (http://support.automation.siemens.com/WW/view/en/58649293).

Product overview
2.2 Operating modes
Technology Module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
14 Manual, 05/2019, A5E35061186-AB
2.2 Operating modes
The technology module supports the following operating modes:
Operating mode
Meaning
Pulse output (Page 21) output of a single pulse with defined On delay and variable pulse dura-
tion (e.g. for dosing using a switch valve)
Pulse width modulation
PWM (Page 34)
•Closed-loop current control, e.g. for controlling the temperature in a
heating resistor
•Output of a frequency with defined period duration and variable duty
cycle (e.g. for controlling a proportional valve)
•Optional dithering: superimposition of a dither signal on the PWM
signal for improving proportional valve control
Pulse train (Page 63) output of a train of pulses with defined period duration and variable pulse
count
On/Off delay (Page 79) pulse output follows the signal at digital input DI0 after a defined switch-
ing delay (e.g. for delayed output with higher output current)
Frequency output
(Page 95)
output of pulses with variable frequency and fixed mark-to-space ratio of
1:1
PWM with DC motor
(Page 108)
Output of a bipolar PWM signal with variable duty cycle for controlling a
brushed DC motor in both directions of rotation

Technology Module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
Manual, 05/2019, A5E35061186-AB 15
Connecting
3
3.1 Terminal assignment and schematic circuit diagram
The TM Pulse 2x24V technology module is used with a BaseUnit of type B1 (article number
6ES7193-6BP20-0BB1).
You connect the digital input and output signals and the sensor supply to the BaseUnit of the
technology module. The supply voltage connected to the BaseUnit supplies the module and
the digital outputs and generates the sensor supply voltage.
BaseUnit
The BaseUnit is not included in the scope of delivery of the module and must be ordered
separately.
You will find an overview of the BaseUnits you can use with the technology module in
Product information on the documentation of the ET 200SP distributed I/O system
(http://support.automation.siemens.com/WW/view/en/73021864).
You can find information on selecting the right BaseUnit in the ET 200SP Distributed I/O
System (http://support.automation.siemens.com/WW/view/en/58649293) system manual and
the ET 200SP Base Units
(http://support.automation.siemens.com/WW/view/en/58532597/133300) equipment manual.
You can find information, for example, on wiring the BaseUnit in the Wiring section of the
ET 200SP Distributed I/O System
(http://support.automation.siemens.com/WW/view/en/58649293) system manual.
Supply voltage L+/M
You connect the supply voltage to the L+ and M terminals of this BaseUnit. The supply
voltage from the module on the left cannot be used for this BaseUnit. An internal protective
circuit protects the technology module from polarity reversal of the supply voltage. The
technology module monitors for connection of the supply voltage.
Note
Point-to-point and low-impedance wiring
High switching frequencies of the outputs and high output current combine to load the central
power supply (24
V
DC) of the plant. You should therefore observe the following when wiring
the module:
•
Connect the supply voltage to the module in a point-to-point manner and with as low
impedance as possible (short cable with as large a cross-section as possible)
•
If necessary, use a separate supply voltage

Connecting
3.1 Terminal assignment and schematic circuit diagram
Technology Module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
16 Manual, 05/2019, A5E35061186-AB
Sensor supply
To supply sensors connected to the digital inputs, the technology module supplies 24 V DC
at the 24VDC output (terminals 1 and 2) with reference to M (terminals 5 and 7 as well as 6
and 8). The voltage is monitored for short-circuit and overload.
Digital input DI0
The digital input DI0 is used for the hardware enable.
The digital inputs of the module are not isolated from each other.
Input delay for digital input
To suppress interference, you can configure an input delay for the digital input.
Note
If you select the "None" or
"0.05
ms" option, you must use a shielded cable for connection of
the digital input.
Digital output DQA / DQB
The digital outputs of the module are not electrically isolated from each other or from the
digital inputs.
The digital outputs of the module are 24 V current-sourcing switches in reference to M and
can handle a rated load current of 2 A. They are protected against overload and short-circuit.
Relays and contactors can be connected directly without external circuitry. You can find
information on the maximum possible operating frequencies and the inductive loads at the
digital outputs in section Technical specifications (Page 148).
Digital outputs are equipped with integrated freewheeling diodes for preventing voltage
overloads due to inductive loads. Additional external freewheeling diodes can impair proper
operation.
DQ0.B and DQ1.B are used only in "PWM with DC motor" mode or are controlled using the
SET_DQB bit in the control interface.
Response of digital outputs to wire break at ground connections
Due to the characteristics of the output driver used in the module, approx. 50 mA supply
current drains through the digital outputs via a parasitic diode following a ground wire break.
This behavior may cause the digital outputs to be set from 0 to 1.
To prevent unintended switching of the outputs following a wire break at a ground
connection, follow these steps:
1. Route the first ground connection from terminal 14 to the ground connection of the central
power supply of the plant.
2. Route the second ground connection from terminal 16 to the ground connection of the
central power supply of the plant.

Connecting
3.1 Terminal assignment and schematic circuit diagram
Technology Module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
Manual, 05/2019, A5E35061186-AB 17
If a wire break interrupts one of the two ground connections, the outputs are maintained at
the required potential via the remaining ground connection.
NOTICE
Wire break at ground connection
Always route two cables to the central ground connection.
The following figure shows the wiring of the technology module in two-channel operation.
Figure 3-1 Wiring in two-channel operation

Connecting
3.1 Terminal assignment and schematic circuit diagram
Technology Module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
18 Manual, 05/2019, A5E35061186-AB
The following figure shows the wiring of the technology module in one-channel operation.
Figure 3-2 Wiring in one-channel operation (parallel connection)
Note
Load wiring resistance
In one
-channel operation, the cables for the DQ0.A and DQ1.A connections must have
identical resistance (length and cross
-section) to achieve optimal current distribution
between the two outputs and to prevent errors in current measurement.
In "PWM with DC motor" mode, the cables for the DQ0.B an
d DQ1.B terminals must also
have identical resistance.
Note
Overheating due to unsuitable loads
A high
-speed output generates very steep edges. This produces a very severe load change
of the connected load, which can result in overheating of the
load under high switching
frequencies.
The connected load must therefore be approved for high frequencies.

Connecting
3.1 Terminal assignment and schematic circuit diagram
Technology Module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
Manual, 05/2019, A5E35061186-AB 19
Terminal assignment of the BaseUnit
The table below shows the terminal assignment of the BaseUnit BU20-P12+A0+4B.
Table 3- 1 Terminal assignment of the BaseUnit BU20-P12+A0+4B
Description
Terminal name
View
Terminal name
Description
24 V DC sensor supply
24VDC
1
2
24VDC
24 V DC sensor supply
Channel 0
Digital input DI0
DI0.0 3 4 DI1.0 Channel 1
Digital input
Channel 0
Ground for digital inputs
M 5 6 M Channel 1
Ground for digital inputs
Channel 0
Ground for digital outputs
M 7 8 M Channel 1
Ground for digital inputs
Channel 0
Digital output DQA
DQ0.A 9 10 DQ1.A Channel 1
Digital output DQA
Channel 0
Digital output DQB
DQ0.B 11 12 DQ1.B Channel 1
Digital output DQB
24 V DC supply voltage L+ 13
(1L)
14
(1N)
M Ground for supply voltage
L+ 15
(2L)
16
(2N)
M
Cable shielding
You must ground the shields of the cables between sensors and the technology module and
connect them to the DIN rail or the ground connection of the central power supply of the
plant.