Siemens Simatic CFU Quick start guide

SIMATIC
Distributed I/O
SIMATIC CFU
Commissioning Manual
Compact Field Unit (CFU Version: V1.1)
07/2018
A5E39252870-AC
Security information 1
What is a Compact Field
Unit? 2
Product overview 3
Functions 4
Operation planning 5
Installation 6
Connecting 7
Commissioning 8
Diagnostics of the CFU 9
Servicing and maintenance 10
Compact Field Unit in the
enclosure for use in a
hazardous area 11
Technical specifications 12
Appendix A

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.
Siemens AG
Division Process Industries and Drives
Postfach 48 48
90026 NÜRNBERG
GERMANY
A5E39252870-AC
Ⓟ 07/2018 Subject to change
Copyright © Siemens AG 2018.
All rights reserved

Table of contents
1 Security information......................................................................................................................................7
2What is a Compact Field Unit?.....................................................................................................................9
3Product overview........................................................................................................................................13
3.1 Inclusion in the automation environment................................................................................13
3.2 Overview of the components..................................................................................................14
3.3 Front view of the CFU............................................................................................................16
3.4 2D matrix code (QR code / EAN code)..................................................................................17
4 Functions....................................................................................................................................................19
4.1 Overview of the interfaces of the SIMATIC CFU PA..............................................................19
4.2 Functions of the fieldbus connections (FB)............................................................................20
5 Operation planning.....................................................................................................................................21
5.1 Rules for the operation...........................................................................................................21
5.2 System change during operation...........................................................................................22
5.3 PA profiles for field devices on PROFIBUS PA......................................................................23
5.4 Use in hazardous areas.........................................................................................................24
5.5 Voltage relationships (galvanic isolation)...............................................................................27
6 Installation..................................................................................................................................................29
6.1 Installation rules.....................................................................................................................29
6.2 Installing the mounting rail.....................................................................................................30
6.3 Installing the CFU...................................................................................................................32
6.4 Removing the CFU.................................................................................................................35
7 Connecting.................................................................................................................................................37
7.1 Hardware-settings..................................................................................................................37
7.2 Wiring rules............................................................................................................................37
7.3 Connecting the power supply to the CFU..............................................................................38
7.4 Connecting the device to the CFU PA (PROFIBUS PA field device, sensor, actuator).........41
7.4.1 Connecting a PROFIBUS PA field device..............................................................................41
7.4.2 Connecting a sensor / final controlling element to the CFU...................................................42
7.5 Connect cables for sensors, actuators and power supply to the connector...........................44
7.5.1 Selecting connection system..................................................................................................44
7.5.2 Cable cross-sections and wire end ferrules...........................................................................45
7.5.3 Connecting the cable using push-in terminals.......................................................................46
7.5.4 Connecting cables using screw terminals..............................................................................47
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7.6 Connecting the cable shields of the PROFIBUS PA cables...................................................47
7.7 Connecting the functional earth to the CFU...........................................................................47
7.8 Communication via PROFINET.............................................................................................49
7.8.1 Connecting the CFU to the PROFINET IO.............................................................................49
8 Commissioning...........................................................................................................................................51
8.1 Switching on the CFU............................................................................................................51
8.2 Startup of field devices depending on the configuration........................................................52
8.3 Commissioning (overview of procedure)................................................................................54
8.4 Configuring CFU with PDM....................................................................................................55
8.4.1 Using a wizard for CFU configuration....................................................................................55
8.4.2 "Commissioning Wizard: Complete" dialog............................................................................57
8.4.3 "Commissioning Wizard: Add/remove/replace field devices only".........................................58
8.4.4 "Commissioning History" dialog.............................................................................................59
8.4.5 "Diagnostic buffer" dialog.......................................................................................................59
8.4.6 "Expert Functions" dialog.......................................................................................................59
8.5 Preparing the CFU for commissioning...................................................................................59
8.5.1 Rules for device names..........................................................................................................59
8.5.2 Assigning device names with existing configuration from HW Config....................................60
8.5.3 Configuring the topology........................................................................................................62
8.5.4 Assigning the CFU parameters without configuration............................................................63
8.6 Requirement for startup of CFU.............................................................................................66
8.7 Commissioning (offline)..........................................................................................................66
8.7.1 Configuring.............................................................................................................................66
8.7.1.1 Overview of configuring and assigning parameters ..............................................................66
8.7.2 Configuration..........................................................................................................................67
8.7.2.1 Introduction to configuring......................................................................................................67
8.7.2.2 Configuring the CFU..............................................................................................................67
8.7.2.3 Configuring a freely configurable channel (DIQ)....................................................................68
8.7.2.4 Configuring a PROFIBUS PA field device (offline).................................................................71
8.7.3 Parameter assignment...........................................................................................................73
8.7.3.1 Introduction to assigning parameters.....................................................................................73
8.7.3.2 Configuring freely configurable channels (parameter overview - DIQ)..................................78
8.7.3.3 Assigning parameters to the PA master (parameter overview - FB M)..................................80
8.7.3.4 Displaying DPV0 alarms on CFU LEDs.................................................................................82
8.7.3.5 Comparing TAGs...................................................................................................................82
8.7.3.6 Service interface....................................................................................................................82
8.7.3.7 Manual integration of a field device........................................................................................83
8.8 Commissioning (online)..........................................................................................................84
8.8.1 Assigning parameters to CFU online via SIMATIC PDM.......................................................84
8.8.2 Simplified commissioning of connected field devices............................................................85
8.8.3 Read back IOs.......................................................................................................................86
8.8.4 Parameter assignment of PROFIBUS PA field device (online)..............................................86
8.8.5 Correcting errors on the PROFIBUS PA................................................................................88
8.9 Configuring with PDM Stand alone........................................................................................89
Table of contents
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9 Diagnostics of the CFU...............................................................................................................................91
9.1 Executing diagnostics of the CFU..........................................................................................91
9.2 Diagnostics via LED displays.................................................................................................91
9.3 Diagnostics with the Maintenance Station.............................................................................95
10 Servicing and maintenance........................................................................................................................99
10.1 Identification and maintenance data......................................................................................99
10.2 Maintenance...........................................................................................................................99
10.3 Removing or inserting the BusAdapter................................................................................100
10.4 Replacing the CFU...............................................................................................................100
10.5 Replacing / modifying a sensor / final controlling element...................................................102
10.6 Overload of freely configurable channels (DIQ<n>).............................................................102
10.7 Replacing field devices........................................................................................................103
10.8 Adding field devices.............................................................................................................104
10.9 Re-reading field device data or restarting the field device...................................................105
10.10 Using service interface.........................................................................................................106
10.11 Reading back the parameters..............................................................................................106
10.12 Restoring the state of delivery..............................................................................................107
11 Compact Field Unit in the enclosure for use in a hazardous area ...........................................................109
11.1 CFU in hazardous areas......................................................................................................109
11.2 Grounding for configuration with SIMATIC CFU PA bundle with aluminum enclosure........110
11.3 Configuration with SIMATIC CFU PA bundle with aluminum enclosure .............................112
11.3.1 Introduction..........................................................................................................................112
11.3.1.1 Installation instructions.........................................................................................................113
11.3.1.2 Design types of protection on the CFU ...............................................................................114
11.3.1.3 Explosion protection.............................................................................................................114
11.3.1.4 Electromagnetic compatibility...............................................................................................115
11.3.2 Installation............................................................................................................................115
11.3.2.1 Configuration with CFU........................................................................................................115
11.3.2.2 Installation............................................................................................................................115
11.3.2.3 Installation rules...................................................................................................................116
11.3.2.4 Installing SIMATIC CFU PA bundle with aluminum enclosure on the mounting surface. ....117
11.3.2.5 Installing the CFU.................................................................................................................118
11.3.2.6 Connecting the cables..........................................................................................................119
11.3.2.7 Connecting the field bus to the CFU....................................................................................121
11.3.2.8 Connecting the cable shields of the PROFIBUS PA cables.................................................122
11.3.2.9 Grounding SIMATIC CFU PA bundle with aluminum enclosure..........................................123
11.3.3 Care and maintenance.........................................................................................................123
11.3.3.1 Information on care and maintenance..................................................................................123
11.3.3.2 Permitted activities in hazardous areas...............................................................................124
11.3.3.3 Maintenance during operation..............................................................................................124
11.3.3.4 Cleaning...............................................................................................................................125
11.3.3.5 Replace pressure compensation element............................................................................125
Table of contents
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12 Technical specifications............................................................................................................................127
12.1 General technical specifications...........................................................................................127
12.1.1 Standards and Approvals.....................................................................................................127
12.1.1.1 CE conformity ......................................................................................................................127
12.1.1.2 ATEX Approval.....................................................................................................................129
12.1.1.3 IECEx approval....................................................................................................................129
12.1.1.4 INMETRO approval..............................................................................................................129
12.1.1.5 UL / CSA approval...............................................................................................................130
12.1.1.6 FM Approval.........................................................................................................................130
12.1.1.7 Tick mark for Australia and New Zealand............................................................................131
12.1.1.8 Safety regulations and special requirements ......................................................................131
12.1.1.9 Standards for communication connections..........................................................................131
12.1.2 Electromagnetic Compatibility..............................................................................................131
12.1.3 Shipping and storage conditions..........................................................................................133
12.1.4 Mechanical and climatic ambient conditions for operation...................................................134
12.1.5 Specifications for insulation tests, protection class and degree of protection......................137
12.1.6 Rated voltage.......................................................................................................................138
12.2 Technical specifications of the Compact Field Unit PA........................................................138
12.3 Technical specifications of the SIMATIC CFU PA bundle with aluminum enclosure...........143
A Appendix...................................................................................................................................................145
A.1 Article numbers (accessories / spare parts).........................................................................145
A.2 Terminal assignment of the CFU PA....................................................................................146
A.3 Mounting rules......................................................................................................................148
A.3.1 Minimum clearances in the control cabinet..........................................................................148
A.3.2 Tools and tightening torques................................................................................................149
A.4 Dimensional diagrams..........................................................................................................149
A.4.1 Dimension drawings of the mounting rails...........................................................................149
A.5 Basics for PROFINET..........................................................................................................151
A.5.1 Pin assignment of the RJ45 connection plug.......................................................................151
A.6 CFU PA: Basics for PROFIBUS PA.....................................................................................151
A.6.1 PROFIBUS addresses of the PROFIBUS PA field devices on the CFU PA (FBn)..............151
A.6.2 Overview of Contents...........................................................................................................152
A.6.3 Intrinsic safety......................................................................................................................152
Glossary...................................................................................................................................................155
Index.........................................................................................................................................................163
Table of contents
SIMATIC CFU
6Commissioning Manual, 07/2018, A5E39252870-AC

Security information 1
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. You can find more information about industrial security by visiting:
https://www.siemens.com/industrialsecurity.
Siemens’ products and solutions undergo continuous development to make them more secure.
Siemens strongly recommends you apply product updates as soon as available and 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
https://www.siemens.com/industrialsecurity.
SIMATIC CFU
Commissioning Manual, 07/2018, A5E39252870-AC 7

Security information
SIMATIC CFU
8Commissioning Manual, 07/2018, A5E39252870-AC

What is a Compact Field Unit? 2
The SIMATIC Compact Field Unit (CFU) is a field unit for use as an IO device on the PROFINET
IO network of an automation system.
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Figure 2-1 Basic integration of a CFU in the automation environment (SIMATIC CFU PA is given as
an example)
● You can find information on the CFU functions in section "Overview of the interfaces of the
SIMATIC CFU PA (Page 19)".
● You can find information on the components required to use a CFU in an automation system
in section "Overview of the components (Page 14)".
Purpose of the operating instructions
These operating instructions provide the information required in order to plan, mount, wire and
commission a Compact Field Unit in automation systems.
SIMATIC CFU
Commissioning Manual, 07/2018, A5E39252870-AC 9

Range of validity of these operating instructions
These operating instructions apply for the following products:
Product Article number from FW*)
SIMATIC CFU PA 6ES7655-5PX11-0XX0
For versions, see section "Article numbers
(accessories / spare parts) (Page 145)"
V1.1
*) Firmware version
These operating instructions contain a description of the components that was valid at the time
the operating instructions were published. We reserve the right to include product information
with information updates with new components and components with a new product status.
Basic knowledge required
To understand these operating instructions you should have general experience in the field of
automation engineering.
Basic knowledge in the following areas is also required:
● Commissioning of electrical components
● Configuring and planning of Ethernet networks and fieldbus systems (PROFINET IO,
PROFIBUS PA)
● MICROSOFT operating system and SIEMENS software (PCS 7; STEP 7; SIMATIC PDM)
If the Compact Field Unit is to be used in a hazardous area, you require the following additional
knowledge:
● Basics of explosion protection
● Identification of explosion-proof devices
● Legal basics of explosion protection
Configuration of the Compact Field Unit
You can configure a Compact Field Unit using:
Type of the Com‐
pact Field Unit
Freely configurable channels
(digital inputs/outputs for sen‐
sors and actuators)
Connections for PA field
devices
Note
SIMATIC CFU PA
*)
●SIMATIC PCS 7
as of V9.0 SP1
or
●STEP 7
as of V5.6 + Upd.2 with
HSP278 and HSP285
SIMATIC PDM as of V9.1
+ Upd.1 with EDD CFU
PA
● Only field devices with PROFIBUS
PA profile V3.x can be operated with
the Compact Field Unit PA.
● We recommend "SIMATIC PDM" as
the optimal tool for the configuration
and diagnostics of connected field
devices.
*) Applicable to all products with an integrated CFU.
What is a Compact Field Unit?
SIMATIC CFU
10 Commissioning Manual, 07/2018, A5E39252870-AC

Position in the overall information structure
In addition to these operating instructions, you will need the following manuals, depending on
the hardware and software used:
● System and standard functions for S7-300/400 (http://support.industry.siemens.com/cs/
ww/en/view/1214574) Reference Manual
● Programming with STEP 7 (http://support.industry.siemens.com/cs/ww/en/view/18652056)
manual
● Configuring hardware and connections with STEP 7 (http://support.industry.siemens.com/
cs/ww/en/view/18652631) manual
● SIMATIC PROFINET - system description (http://support.industry.siemens.com/cs/ww/en/
view/19292127) System Manual
● SIMATIC NET Industrial Ethernet / PROFINET Industrial Ethernet (http://
support.industry.siemens.com/cs/ww/en/view/27069465) manual
● SIMATIC PDM (http://support.industry.siemens.com/cs/ww/en/view/109482406) manual
You can find information on explosion protection in the corresponding directives and standards.
Using documentation, app and PUD manager
Documentation updates and CFU product information can be found on the internet (https://
support.industry.siemens.com/cs/ww/en/view/109748741).
Information on the app and its download is available on the internet (see section "2D matrix
code (QR code / EAN code) (Page 17)").
When using the PUD Manager to display the online help, you can integrate the appropriate
documentation into your downloaded help files.
Information about the PUD Manager can be found in the corresponding FAQ (https://
support.industry.siemens.com/cs/ww/en/view/109748882).
Conventions
The following terms are used as synonyms in this document:
Term in the manual Synonyms Notes
CFU Compact Field Unit Applies, if not otherwise specified, to all types of SIMATIC CFU.
CFU PA Compact Field Unit PA Applies, if not otherwise specified, for the product SIMATIC CFU PA.
Fieldbus PROFIBUS PA Applies, if not otherwise specified, for the PROFIBUS PA as a fieldbus.
Fieldbus connection Port or spur line The interface or spur line to a PROFIBUS PA field device on the CFU.
Observe the notes that are marked as follows:
Note
A note contains important information about the product described, about handling the product
or about a specific section of the documentation that requires particular attention.
What is a Compact Field Unit?
SIMATIC CFU
Commissioning Manual, 07/2018, A5E39252870-AC 11

Recycling and disposal
The described components are ecologically compatible, and thus suitable for recycling. For
environmentally sound recycling and disposal of your old devices please contact a certified
disposal service company for electronic scrap.
Changes compared to the previous version
The following is an overview of the key changes in the documentation compared to the previous
version:
From CFU firmware V1.1:
● Service port for field devices
● Setting the fieldbus connections is simplified by using the freeze function
● Field device name can be adjusted via the commissioning wizard
● Manual integration of a field device is possible
Additional support
● You can reach the Technical Support for all the Industry Automation products via the Web
form for the Support Request (http://support.industry.siemens.com/My/ww/en/requests).
● Should you have any questions on the products described in this documentation for which
you cannot find any answers here.
Please contact your SIEMENS contact person: Representatives and offices (http://
support.industry.siemens.com/aspa_app/)
● The technical documentation for the various SIMATIC products and systems is available
on the Internet (http://support.industry.siemens.com/My/ww/en/requests).
● You can find the online catalog and online ordering system on the Internet (http://
www.siemens.com/automation/mall).
What is a Compact Field Unit?
SIMATIC CFU
12 Commissioning Manual, 07/2018, A5E39252870-AC

Product overview 3
3.1 Inclusion in the automation environment
Basic integration of a CFU in the automation environment
The following figure demonstrates the basic integration of a CFU in the automation
environment using the example of a CFU PA.
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Distributed I/O devices - field of use
When structuring a system the inputs and outputs from or to the process are often integrated
centrally into the automation system.
In the case of large distances of the inputs and outputs from the automation system the wiring
can become very extensive and unstructured. Electromagnetic interferences can impair the
reliability. The flexibility of a central installation is also limited.
SIMATIC CFU
Commissioning Manual, 07/2018, A5E39252870-AC 13

The use of distributed I/Os is suitable for such systems:
● The automation system is located at a central position.
● The I/O devices (inputs and outputs) operate decentrally on site.
● The CFU PA with its integrated BusLink between PROFINET IO and PROFIBUS PA
enables decentralized connection of PA field devices to the CPU of the automation system.
3.2 Overview of the components
Basic components of CFU types
The following basic components are available for the CFU types:
Table 3-1 Mounting rail
Function Figure
The mounting rail is the component on which the CFU is fastened.
Mounting rail TH 35 in accordance with EN 60715
Table 3-2 SIMATIC CFU PA (article number: 6ES7655-5PX11-0XX0)
Function Figure
CFU PA:
● Integrate the CFU PA as an IO device on PROFINET IO in the automation system.
● The CFU PA has the following interfaces:
– Eight fieldbus connections for each field device on PROFIBUS PA (FIELDBUS).
– Eight freely configurable channels (DIQ).
● You can find displays for the device status on the interface dome.
Supplementary information:
● Section "Overview of the interfaces of the SIMATIC CFU PA (Page 19)"
● Section "Diagnostics via LED displays (Page 91)"
● Section "Overview of the interfaces of the SIMATIC CFU PA (Page 19)"
Product overview
3.2 Overview of the components
SIMATIC CFU
14 Commissioning Manual, 07/2018, A5E39252870-AC

Table 3-3 BusAdapter
Function Figure
You will need approved BusAdapters to connect a CFU to PROFINET IO. The BusA‐
dapters give you flexibility in selection of the connection technology for PROFINET IO.
The figure shows some typical device implementations of the BusAdapter.
There are BusAdapters for pre-fabricated specific bus cables and BusAdapters for
special media (fiber-optic cable, electrically conductive cables).
Approved BusAdapter versions for connecting a CFU to PROFINET IO are listed in
section "Table A-2 BusAdapter for PROFINET (Page 145)".
Terminal set required
You need the approved terminal set to operate the CFU.
Type and use Quanti‐
ty
Area Terminal
Two-fold double terminals for connection of power supply (PS) 2 24 V DC X80 and X81
Six-fold terminals for reference potential (ground) 1 GND X82
Eight-fold terminals
● for connecting sensors and/or actuators
● for connecting field devices
2 DIQ X10 and X11
2 FIELDBUS X1 and X2
Additional information
Article numbers of these and other components are available in section "Article numbers
(accessories / spare parts) (Page 145)".
Product overview
3.2 Overview of the components
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Commissioning Manual, 07/2018, A5E39252870-AC 15

3.3 Front view of the CFU
Front view
The following figure shows the front view of the CFU using the CFU PA as an example.
$%$&'()*
Functional elements Additional elements
1 Slot X5: Connection for a BusAdapter A Locking the CFU on the mounting rail
2 Diagnostic LED on interface dome B Labeling strips on interface dome
3 Slots X80 and X81: 24 V DC; power supply PS1/ PS2
(redundant connection possible)
C MAC address
4 Slot X82: GND: Connection for reference potential
(ground)
D Product version
5 Slot X10/X11:
DIQ: Connections of freely configurable channels
DIQ<n>:
● <n>+ signal line
● <n>- signal line
E 2D matrix code (QR code / EAN code) (Page 17)
6 Slot X1/X2:
FIELDBUS; connections for one field device each.
Spur line FB<n>:
max. 120 m length; cable termination with automatic
bus terminator
● <n>+ data cable (red)
● <n>- data cable (green)
F Rating plate
7 Reset: Restore delivery state - reset to factory settings: G Assembly instruction (latch onto the mounting rail from
below)
Product overview
3.3 Front view of the CFU
SIMATIC CFU
16 Commissioning Manual, 07/2018, A5E39252870-AC

Additional information
You can find information on connecting terminals in the following sections:
● Section "Terminal assignment of the CFU PA (Page 146)"
● Section "Connecting the power supply to the CFU (Page 38)"
● Section "Connecting a PROFIBUS PA field device (Page 41)"
● Section "Connecting the cable shields of the PROFIBUS PA cables (Page 122)"
● Section "Connecting a sensor / final controlling element to the CFU (Page 42)"
Resetting using the Reset button: You can find information about this in section "Restoring the
state of delivery (Page 107)".
3.4 2D matrix code (QR code / EAN code)
The 2D matrix code on the product is a coded representation of the product-specific article
number.
Access to product-related information
For reading the 2D matrix code, SIEMENS offers an app for mobile use.
Information about the app and the download can be found on the Internet: "Mobile use via app
(https://support.industry.siemens.com/cs/ww/en/sc/2067)".
The app provides direct access to the technical forum and product related posts, such as:
● FAQs
● Application examples
● Manuals
● Certificates
● Product notices
Product overview
3.4 2D matrix code (QR code / EAN code)
SIMATIC CFU
Commissioning Manual, 07/2018, A5E39252870-AC 17

Product overview
3.4 2D matrix code (QR code / EAN code)
SIMATIC CFU
18 Commissioning Manual, 07/2018, A5E39252870-AC

Functions 4
4.1 Overview of the interfaces of the SIMATIC CFU PA
The CFU is an IO device on the higher-level PROFINET IO system.
Interfaces
The CFU PA has the following interfaces:
Interface Quantity Supplementary note
Interfaces for bus systems:
PROFINET IO 1 connection
(terminal X5 of the
CFU for a BusAdapter)
BusAdapter with 2 ports (X1) for redundant connection to
PROFINET IO or forwarding the PROFINET IO.
Redundant connection is possible:
● Media redundancy (MRP)
● Singular system redundancy (S2)
The approved BusAdapter variants for connecting the
CFU to PROFINET IO are listed in section "Article num‐
bers (accessories / spare parts) (Page 145)".
PROFIBUS PA 8 fieldbus connections
FIELDBUS (FB<n>)
One field device per connection (FB<n>).
Maximum current per connection/channel: 40 mA
Channels (freely configurable: Digital inputs / outputs)
●Channel
configured
as an input
Max. 8 channels
DIQ (DIQ<n>)
● Input voltage: max. 30 V
● Integrated sensor supply
Maximum current per channel: 500 mA
●Channel
configured
as an output
Max. 8 channels
DIQ (DIQ<n>)
● Signal voltage: max. 30 V
● Maximum current per channel: 500 mA
Note: The parallel connection of the DQ channels is im‐
permissible.
Power supply PSx
24 V terminal PSx (X80/X81) Redundant supply possible
Connection for ref‐
erence potential
(ground)
6 connections for ref‐
erence potential
(ground) (X82)
For optional connection of a sensor to ground.
Additional information
Section "Technical specifications (Page 127)"
See also
Configuring a PROFIBUS PA field device (offline) (Page 71)
SIMATIC CFU
Commissioning Manual, 07/2018, A5E39252870-AC 19

4.2 Functions of the fieldbus connections (FB)
FIELDBUS
The CFU PA compiles the protocols between the PROFINET IO and the PROFIBUS PA.
With regard to field devices, the CFU PA operates like a BusLink (PROFINET IO to PROFIBUS
PA) with connected field distributors for PA field devices.
You connect the PA field devices to the "FIELDBUS; FB<n>" connections on the CFU PA.
CFU PA and PA field devices form a common autonomous PROFIBUS PA system.
Parameters
Information on parameter assignment of the field devices can be found in the documentation
of the field device.
Availability
● For the "Fieldbus; FB<n>" connections, the following applies when physical faults occur
(such as wire break or short circuit):
– Faulty connections are automatically deactivated as long as the fault exists.
– The bus is automatically terminated
● Repairs and extensions at the individual "Fieldbus: FB<n>" connections are possible during
operation.
Additional information
● Section "Voltage relationships (galvanic isolation) (Page 27)"
● Section "Diagnostics via LED displays (Page 91)"
● Section "Using service interface (Page 106)"
● You can find information on configuring and assigning parameters in section
"Commissioning (offline) (Page 66)".
Functions
4.2 Functions of the fieldbus connections (FB)
SIMATIC CFU
20 Commissioning Manual, 07/2018, A5E39252870-AC