Beckhoff CX8191 Users guide

Manual | EN

CX8191

Embedded PC with BACnet/IP

6/29/2020 | Version: 1.0

Table of contents

Table of contents

1 Notes on the documentation ....................................................................................................................5

1.1 Representation and structure of warnings.........................................................................................6

1.2 Documentation issue status ..............................................................................................................7

2 For your safety...........................................................................................................................................8

2.1 Intended use......................................................................................................................................8

2.2 Staff qualification ...............................................................................................................................8

2.3 Safety instructions .............................................................................................................................9

3 Transport and storage.............................................................................................................................10

4 Product overview.....................................................................................................................................11

4.1 Structure ..........................................................................................................................................13

4.2 Name plate ......................................................................................................................................14

4.3 Ethernet interfaces ..........................................................................................................................15

4.4 BACnet/IP........................................................................................................................................18

4.5 MicroSD card...................................................................................................................................19

4.6 Reset button ....................................................................................................................................19

5 Commissioning........................................................................................................................................20

5.1 Mounting..........................................................................................................................................20

5.1.1 Dimensions ...................................................................................................................... 20

5.1.2 Note the permissible installation positions....................................................................... 21

5.1.3 Securing on mounting rail ................................................................................................ 23

5.2 Connecting the power supply ..........................................................................................................24

6 Configuration ...........................................................................................................................................26

6.1 Operating system ............................................................................................................................26

6.1.1 Features included ............................................................................................................ 27

6.1.2 Update image .................................................................................................................. 28

6.1.3 FTP Server ...................................................................................................................... 29

6.2 IP address .......................................................................................................................................31

6.2.1 Setting with DIP switches ................................................................................................ 31

6.2.2 Setting in the operating system ....................................................................................... 32

6.3 Web service.....................................................................................................................................33

6.3.1 Starting the Beckhoff Device Manager ............................................................................ 33

6.3.2 Enabling a remote display ............................................................................................... 34

6.3.3 Changing the IP address of the Ethernet interfaces (X101, X102).................................. 35

6.3.4 Starting a remote connection........................................................................................... 36

6.4 TwinCAT..........................................................................................................................................37

6.4.1 Connecting to the CX81xx ............................................................................................... 37

6.4.2 Scanning for devices ....................................................................................................... 39

6.4.3 Creating a BACnet server and a device object................................................................ 40

6.4.4 Linking to IO task ............................................................................................................. 42

7 Programming ...........................................................................................................................................45

7.1 Seconds UPS ..................................................................................................................................45

7.1.1 Function block.................................................................................................................. 47

7.1.2 Data types........................................................................................................................ 49

CX8191 3Version: 1.0

Table of contents

7.1.3 PlcAppSystemInfo ........................................................................................................... 50

7.2 Function F_CX81xx_ADDRESS......................................................................................................51

7.3 Real Time Clock (RTC)....................................................................................................................51

8 Ethernet X001 Interface...........................................................................................................................52

8.1 Ethernet ...........................................................................................................................................52

8.2 Topology example ...........................................................................................................................54

8.3 ADS-Communication .......................................................................................................................54

9 Error handling and diagnosis.................................................................................................................56

9.1 Diagnostic LEDs ..............................................................................................................................56

9.2 K-bus ...............................................................................................................................................56

9.3 E-bus ...............................................................................................................................................59

10 Care and maintenance ............................................................................................................................60

10.1 Replace the battery .........................................................................................................................60

11 Technical data..........................................................................................................................................61

12 Appendix ..................................................................................................................................................63

12.1 Certification......................................................................................................................................63

12.1.1 FCC ................................................................................................................................. 63

12.2 Support and Service ........................................................................................................................64

CX81914 Version: 1.0

Notes on the documentation

1 Notes on the documentation

This description is only intended for the use of trained specialists in control and automation engineering who
are familiar with applicable national standards.
It is essential that the documentation and the following notes and explanations are followed when installing
and commissioning the components.
It is the duty of the technical personnel to use the documentation published at the respective time of each
installation and commissioning.

The responsible staff must ensure that the application or use of the products described satisfy all the
requirements for safety, including all the relevant laws, regulations, guidelines and standards.

Disclaimer

The documentation has been prepared with care. The products described are, however, constantly under
development.
We reserve the right to revise and change the documentation at any time and without prior announcement.
No claims for the modification of products that have already been supplied may be made on the basis of the
data, diagrams and descriptions in this documentation.

Trademarks

Beckhoff®, TwinCAT®, EtherCAT®, EtherCAT G®, EtherCAT G10®, EtherCAT P®, Safety over EtherCAT®,
TwinSAFE®, XFC®, XTS® and XPlanar® are registered trademarks of and licensed by Beckhoff Automation
GmbH.
Other designations used in this publication may be trademarks whose use by third parties for their own
purposes could violate the rights of the owners.

Patent Pending

The EtherCAT Technology is covered, including but not limited to the following patent applications and
patents:
EP1590927, EP1789857, EP1456722, EP2137893, DE102015105702
with corresponding applications or registrations in various other countries.

EtherCAT® is a registered trademark and patented technology, licensed by Beckhoff Automation GmbH,
Germany

Copyright

© Beckhoff Automation GmbH & Co. KG, Germany.
The reproduction, distribution and utilization of this document as well as the communication of its contents to
others without express authorization are prohibited.
Offenders will be held liable for the payment of damages. All rights reserved in the event of the grant of a
patent, utility model or design.

CX8191 5Version: 1.0

Notes on the documentation

1.1 Representation and structure of warnings

The following warnings are used in the documentation. Read and follow the warnings.

Warnings relating to personal injury:

DANGER

Hazard with high risk of death or serious injury.

WARNING

Hazard with medium risk of death or serious injury.

CAUTION

There is a low-risk hazard that can result in minor injury.

Warnings relating to damage to property or the environment:

NOTE

There is a potential hazard to the environment and equipment.

Notes showing further information or tips:

This notice provides important information that will be of assistance in dealing with the product or
software. There is no immediate danger to product, people or environment.

CX81916 Version: 1.0

1.2 Documentation issue status

Version Comment

1.0 First version

Notes on the documentation

CX8191 7Version: 1.0

For your safety

2 For your safety

Read the chapter on safety and follow the instructions in order to protect from personal injury and damage to
equipment.

Limitation of liability

All the components are supplied in particular hardware and software configurations appropriate for the
application. Unauthorized modifications and changes to the hardware or software configuration, which go
beyond the documented options, are prohibited and nullify the liability of Beckhoff Automation GmbH & Co.
KG.

In addition, the following actions are excluded from the liability of Beckhoff Automation GmbH & Co. KG:

• Failure to comply with this documentation.

• Improper use.

• Untrained personnel.

• Use of unauthorized replacement parts.

2.1 Intended use

The CX81xx Embedded PC is a control system and is intended for mounting on a DIN rail in a control
cabinet or terminal box.

The Embedded PC series is used in conjunction with Bus Terminals for recording digital or analog signals
from sensors and transferring them to actuators or higher-level controllers.

The Embedded PC is designed for a working environment that meets the requirements of protection class
IP20. This involves finger protection and protection against solid foreign objects up to 12.5 mm, but not
protection against water. Operation of the devices in wet and dusty environments is not permitted, unless
specified otherwise. The specified limits for electrical and technical data must be adhered to.

Improper use

The Embedded PC is not suitable for operation in the following areas:

• Potentially explosive atmospheres.

• Areas with an aggressive environment, e.g. aggressive gases or chemicals.

• Living areas. In living areas, the relevant standards and guidelines for interference emissions must be
adhered to, and the devices must be installed in housings or control boxes with suitable attenuation of
shielding.

2.2 Staff qualification

All operations involving Beckhoff software and hardware may only be carried out by qualified personnel with
knowledge of control and automation engineering. The qualified personnel must have knowledge of the
administration of the Embedded PC and the associated network.

All interventions must be carried out with knowledge of control programming, and the qualified personnel
must be familiar with the current standards and guidelines for the automation environment.

CX81918 Version: 1.0

For your safety

2.3 Safety instructions

The following safety instructions must be followed during installation and working with networks and the
software.

Mounting

• Never work on live equipment. Always switch off the power supply for the device before installation,
troubleshooting or maintenance. Protect the device against unintentional switching on.

• Observe the relevant accident prevention regulations for your machine (e.g. the BGV A 3, electrical
systems and equipment).

• Ensure standard-compliant connection and avoid risks to personnel. Ensure that data and supply
cables are laid in a standard-compliant manner and ensure correct pin assignment.

• Observe the relevant EMC guidelines for your application.

• Avoid polarity reversal of the data and supply cables, as this may cause damage to the equipment.

• The devices contain electronic components, which may be destroyed by electrostatic discharge when
touched. Observe the safety precautions against electrostatic discharge according to DIN EN
61340-5-1/-3.

Working with networks

• Limit physical and electronic access to all devices to an authorized group of persons.

• Change the default passwords to reduce the risk of unauthorized access. Regularly change the
passwords.

• Install the devices behind a firewall.

• Apply the IT security precautions according to IEC 62443, in order to limit access to and control of
devices and networks.

Working with the software

• Use up-to-date security software. The safe function of the Embedded PC can be compromised by
malicious software such as viruses or Trojans.

• The sensitivity of an Embedded PC against malicious software increases with the number of installed
and active software.

• Uninstall or disable unnecessary software.

Further information about the safe handling of networks and software can be found in the Beckhoff
Information System:

http://infosys.beckhoff.com

Document name

Documentation about IPC Security

CX8191 9Version: 1.0

Transport and storage

3 Transport and storage

Transport

NOTE

Short circuit due to moisture

Moisture can form during transport in cold weather or in the event of large temperature fluctuations.

Avoid moisture formation (condensation) in the Embedded PC, and leave it to adjust to room temperature
slowly. If condensation has occurred, wait at least 12 hours before switching on the Embedded PC.

Despite the robust design of the unit, the components are sensitive to strong vibrations and impacts. During
transport the Embedded PC must be protected from

• mechanical stress and

• use the original packaging.

Table1: Dimensions and weight of the CX8191 Embedded PC.

CX8191

Dimensions (WxHxD) 71 mm x 100 mm x 73 mm

Weight 230g

Storage

• The battery should be removed if the Embedded PC is stored at temperatures above 60°C. The
battery should be stored separate from the Embedded PC in a dry environment at a temperature
between 0 °C and 30 °C.
The preset date and time are lost if the battery is removed.

• Store the Embedded PC in the original packaging.

CX819110 Version: 1.0

Product overview

4 Product overview

CX8100 designates a product family of Embedded PCs based on a 32-bit ARM CPU. The CX8100
Embedded PC is programmable and is able to execute its own control program. In addition to that the
Embedded PC acts as a slave device of a higher-level fieldbus system.

The CX8100 Embedded PC has the following basic configuration:

• a 512MB MicroSD card,

• an Ethernet interface

• as well as two switched Ethernet interfaces (2 x RJ45, switched).

You can use the CX8100 Embedded PCs as decentralized controllers and in this way ensure that the local
program continues to be executed on the CX8100 in the event of an interruption in the higher-level fieldbus
system.

The operating system is Microsoft Windows Embedded Compact 7. Because there is no monitor port, the
operating system and its "virtual" display can only be accessed via the network. Beckhoff Device Manager
and Remote Display (Cerhost)

The Embedded PC features an internal 1-second UPS as persistent data memory. The 1-second UPS
enables persistent data to be saved to the MicroSD card in the event of a power failure.

Power supply terminal

The power supply terminal for the Embedded PC is located on the right-hand side. Bus Terminals (K-bus) or
EtherCAT Terminals (E-bus) can be attached on the right-hand side of the power supply terminal. The power
supply terminal automatically recognizes the respective bus system (K-bus or E-bus).

The use of EtherCAT Terminals (E-bus) enables further options, such as the implementation of different
topologies, the integration of further bus systems such as CANopen, PROFIBUS and PROFINET and – with
the EtherCAT Box Modules – connection to the IP67 world.

Fieldbus interface

CX8100 devices are being prepared for further fieldbus systems such as EtherCAT (slave), PROFINET,
EtherNet/IP, CANopen, PROFIBUS and other communication systems.

Available fieldbus systems:

• CX8110: EtherCAT

• CX8180: RS232/485

• CX8190: Ethernet (Realtime Ethernet, ADS UDP, ADS TCP, EAP, Web Services)

• CX8191: BACnet (client and server)

Programming

The CX8100 Embedded PCs are programmed according to the high-performance IEC61131-3 standard.
The TwinCAT 3 automation software forms the basis for the programming of the Embedded PC.

Configuration

The CX8100 Embedded PC is commissioned via the Ethernet interface. The fieldbus interface and all
connected devices such as EtherCAT Terminals or Bus Terminals are then read out via TwinCAT 3. The
configuration is stored on the Embedded PC after the parameterization. The configuration thus created can
be accessed again later.

The shortest usable task time is 500µs, although this is only achievable with a very small system load. A
task time of 1 to 50ms is recommended for the I/O data. Other tasks can also be set slower. When using
shorter cycle times, the total system load is to be observed.

CX8191 11Version: 1.0

Product overview

If too short a cycle time is selected, the Web visualization and Remote Display may operate very slowly or
cause timeouts. The user is responsible for configuring his system such that it is not overloaded.

CX819112 Version: 1.0

Product overview

1

2

7

4

8

10
11

12

14

3

13

15

5

6

9

10

4.1 Structure

Fig.1: Sample configuration of a CX8191 Embedded PC.

Table2: Legend for the configuration.

No. Component Description

1

2

3

4

5

6

7

8

9 Spring-loaded terminals,

10 Terminal bus (K-bus or E-

11 Spring-loaded terminal,

12 Spring-loaded terminal, 0V Power supply for Bus Terminals via power contact.

13 Terminal release Releases the power supply terminal and therefore the Embedded

14 Spring-loaded terminal, PE Spring-loaded terminal for power contact PE.

15 Power contacts, +24V,

Also see about this

2 Setting with DIP switches [}31]

CX8191 13Version: 1.0

DIP switch [}31] (S101).

Battery compartment
[}60] (under the front

flap).

MicroSD card slot [}19]

(under the front flap).

Ethernet interfaces RJ45
[}15] (X101, X102).

Reset button [}19]

Diagnostic LEDs [}56].

Ethernet interface [}15]

(X001).

Diagnostic LEDs, power
supply terminal [}56].

+24V and 0V

bus)

+24V

0V, PE

You can set the IP address for the X101/X102 switched Ethernet
interfaces with the DIP switch.

Power supply for the battery-backed clock for time and date.

Slot for industrial MicroSD cards.

BACnet/IP (client and server)

This switches the Embedded PC to Config mode.

Diagnostic LEDs. You can create your own diagnostic messages
for the WD and ERR diagnostic LEDs (see: Controlling CX8190
LEDs).

Interface for commissioning and programming the Embedded PC.

Diagnosis of the power supply for the Embedded PC and the
terminal bus. Status of the E-bus and K-bus communication.

Power supply for Embedded PC.

Interface for EtherCAT Terminals or Bus Terminals. Data exchange
and supply.

Power supply for Bus Terminals via power contact.

PC from the mounting rail.

Power contacts for Bus Terminals.

Product overview

1

2

5

3

4

6

4.2 Name plate

The CX8191 Embedded PC features a name plate on the left-hand side of the housing.

Fig.2: CX8191 name plate.

Table3: Legend for the name plate.

No. Description

1 Information on the power supply unit. 24VDC, 4A max.

2 MAC address of the Ethernet interface X001.

By default, the host name is formed from CX plus the last 3 bytes of the MAC address:
for example, the MAC address: 00-01-05-aa-bb-cc results in the host name CX-aabbcc.

3 Information on:

• serial number,

• hardware version

• and date of manufacture.

4 Information on the model. The last two numbers code the version of the Embedded PC.

5 Vendor data including address.

6 CE conformity.

CX819114 Version: 1.0

Product overview

4.3 Ethernet interfaces

You can program and commission the CX8191 Embedded PC via the X001 Ethernet interface. The Ethernet
interface achieves speeds of 10/100Mbit/s.

Fig.3: Ethernet interface X001, X101, X102.

The LEDs on the left of the interfaces indicate the connection status. The upper LED (LINK/ACT) indicates
whether the interface is connected to a network. If this is the case the LED is green. The LED flashes when
data transfer on the interface is in progress.

The lower LED (SPEED) indicates the connection speed. The LED is not lit if the speed is 10Mbit/s. At
100MBit/s, the LED lights up orange.

Table4: Ethernet interface X001, pin assignment.

PIN Signal Description

1 TD + Transmit +

2 TD - Transmit -

3 RD + Receive +

4 connected reserved

5

6 RD - Receive -

7 connected reserved

8

Ethernet interfaces X101 and X102

Both Ethernet interfaces are switched and independent of each other. Both Ethernet interfaces reach speeds
of 100Mbit/s.

The switched interface can be used for BACnet or OPC UA protocols.

Table5: Ethernet interfaces X101 and X102, pin assignment.

PIN Signal Description

1 TD + Transmit +

2 TD - Transmit -

3 RD + Receive +

4 connected reserved

5

6 RD - Receive -

7 connected reserved

8

CX8191 15Version: 1.0

Product overview

Transmission standards

10Base5

The transmission medium for 10Base5 consists of a thick coaxial cable ("yellow cable") with a max.
transmission speed of 10Mbaud arranged in a line topology with branches (drops) each of which is
connected to one network device. Because all the devices are in this case connected to a common
transmission medium, it is inevitable that collisions occur often in 10Base5.

10Base2

10Base2 (Cheaper net) is a further development of 10Base5, and has the advantage that the coaxial cable is
cheaper and, being more flexible, is easier to lay. It is possible for several devices to be connected to one
10Base2 cable. It is frequent for branches from a 10Base5 backbone to be implemented in 10Base2.

10BaseT

Describes a twisted pair cable for 10Mbaud. The network here is constructed as a star. It is no longer the
case that every device is attached to the same medium. This means that a broken cable no longer results in
failure of the entire network. The use of switches as star couplers enables collisions to be reduced. Using
full-duplex connections they can even be entirely avoided.

100BaseT

Twisted pair cable for 100MBaud. It is necessary to use a higher cable quality and to employ appropriate
hubs or switches in order to achieve the higher data rate.

10BaseF

The 10BaseF standard describes several optical fiber versions.

Short description of the 10BaseT and 100BaseT cable types

Twisted pair copper cable for star topologies, where the distance between two devices may not exceed 100
meters.

UTP

Unshielded twisted pair
This type of cable belongs to category 3, and is not recommended for use in an industrial environment.

S/UTP

Screened/unshielded twisted pair (screened with copper braid)
Has a general screen of copper braid to reduce influence of external interference. This cable is
recommended for use with Bus Couplers.

FTP

Foiled shielded twisted pair (screened with aluminum foil)
This cable has an outer screen of laminated aluminum and plastic foil.

S/FTP

Screened/foiled-shielded twisted pair (screened with copper braid and aluminum foil)
Has a laminated aluminum screen with a copper braid on top. Such cables can provide up to 70dB reduction
in interference power.

CX819116 Version: 1.0

Product overview

STP

Shielded twisted pair
Describes a cable with an outer screen, without defining the nature of the screen any more closely.

S/STP

Screened/shielded twisted pair (wires are individually screened)
This identification refers to a cable with a screen for each of the two wires as well as an outer shield.

ITP

Industrial Twisted-Pair
The structure is similar to that of S/STP, but, in contrast to S/STP, it has only one pair of conductors.

CX8191 17Version: 1.0

Product overview

4.4 BACnet/IP

BACnet (Building Automation Control Network) is a standardized, manufacturer-independent communication
protocol for building automation. The protocol is used in HVAC, lighting control, security and fire alarm
applications.

As a BACnet building controller (B-BC), the CX8191 Embedded PC meets the following requirements:

• Certification to BACnet standard ISO 16484-5 Revision 14

• Support of the AS-B profile (extended functional range) according to AMEV BACnet 2017

• Integration of the BACnet protocol into the TwinCAT System Manager

• Newly developed library that can be used to create and change BACnet objects directly in the PLC
runtime and to store the properties persistently

• All string encoding character sets defined in the BACnet standard (UTF8, USC2, USC2, ISO8859 ...)
are supported )

BACnet supplement TF8020

The BACnet supplement TF8020 is pre-installed on the CX8191 in delivery state. No further installations or
keys are required. The TF8020 BACnet supplement can only be used via the X101/102 Ethernet interfaces.

Further Information:
TF8020 supplement description: https://beckhoff.de/tf8020/

Adding the OPC UA TF6100 supplement

In contrast to the CX8091 predecessor device, the OPC UA TF6100 supplement is not pre-installed on the
CX8191. OPC UA and other protocols such as Modbus/TCP can be activated and licensed later using the
license manager.

Memory usage

Under certain circumstances, the RAM available on the CX8191 can be ‘eaten up’ with trend log objects.
Check whether enough RAM is available for your application. Beckhoff recommends a maximum of 750
BACnet objects.

This is a guide value; the actual value may be higher or lower. It depends on the CPU and RAM load and on
the BACnet objects used.

CX819118 Version: 1.0

Product overview

4.5 MicroSD card

In the basic configuration, the CX81xx contains a MicroSD card with 512MB. You can order it as an option
with larger cards (up to 8GB).

The cards employed are SLC memory with extended temperature range for industrial applications. Use
exclusively MicroSD cards approved by Beckhoff.

Example of a MicroSD card:

Order designation Capacity Description

CX1900-0123 1GB MicroSD card (SLC memory) with

CX1900-0125 2GB

CX1900-0127 4GB

CX1900-0129 8GB

Order designation Capacity Description

CX1900-0122 512MB MicroSD card (SLC memory) with

CX1900-0124 1GB

CX1900-0126 2GB

CX1900-0128 4GB

CX1900-0130 8GB

extended temperature range for
industrial applications instead of
the 512MB card (ordering option)

extended temperature range for
industrial applications as spare
part.

4.6 Reset button

Use the Reset button to activate Config mode. You can use this function if the PLC program unexpectedly
causes an error. To do this, keep the Reset button pressed during the restart for an extended period.

Activate Config mode as follows:

1. Open the front flap.

2. Switch off the Embedded PC.

3. Start the Embedded PC and keep the Reset button pressed until the ERR LED turns red and then
yellow.

ð The CX81xx Embedded PC is put into Config mode.

CX8191 19Version: 1.0

Commissioning

5 Commissioning

5.1 Mounting

5.1.1 Dimensions

Fig.4: Dimensions of the CX81xx Embedded PC.

Technical drawings in DWG and STP formats can be found at:

http://www.beckhoff.com

CX819120 Version: 1.0

Commissioning

5.1.2 Note the permissible installation positions

Increased heat generation

The Embedded PC may overheat if the installation position is incorrect or the minimum distances
are not adhered to.

Ensure adequate ventilation. A horizontal installation position is ideal. Leave at least 30 mm clear­ance above and below the Embedded PC.

Note the following specifications for the control cabinet:

• Keep to the prescribed ambient temperature. Measure the temperature below the Embedded PC at a
distance of 30mm to the cooling fins, in order to determine the ambient temperature correctly.

• Adhere to the minimum distances of 30mm above and below the Embedded PCs.

• Additional electrical equipment affects the heat generation in the control cabinet. Select a suitable
control cabinet enclosure depending on the application, or ensure that excess heat is dissipated from
the control cabinet.

Prescribed installation position for temperatures up to 60°C

Install the Embedded PC horizontally in the control cabinet on a mounting rail, in order to ensure optimum
heat dissipation.

Ventilation openings are located at the top and bottom of the housing. This ensures an optimum airflow
through the Embedded PC in vertical direction. In addition, a minimum clearance of 30mm above and below
the Embedded PCs is required, in order to ensure adequate ventilation.

Fig.5: Embedded PC CX8191, horizontal installation position.

CX8191 21Version: 1.0

Commissioning

Installation positions with reduced temperature range up to 50°C

You can also mount the Embedded PC vertically or horizontally on the mounting rail. Note that you can then
only operate the Embedded PC up to an ambient temperature of 50°C.

Fig.6: Embedded PC CX8191, vertical installation position.

Fig.7: Embedded PC CX8191, horizontal installation position.

Ensure that Bus Terminals that are connected to the Embedded PC are designed for operation in vertical or
horizontal position.

CX819122 Version: 1.0

Commissioning

5.1.3 Securing on mounting rail

The housing is designed such that the Embedded PC can be pushed against the mounting rail and latched
onto it. The Embedded PC is fastened to the DIN rail by means of a catch on the left side of the Embedded
PC.

Requirements:

• Mounting rail of type TS35/7.5 or TS35/15 according to DIN EN 60715.

Secure the Embedded PC on the mounting rail as follows:

1. Place the Embedded PC at the front of the mounting rail. Slightly press the Embedded PC onto the
mounting rail until a soft click can be heard and the Embedded PC has latched.

2. Subsequently, lock the catch on the left side of the Embedded PC. Use a screwdriver to do this.

ð Double-check the correct installation and latching of the Embedded PC on the mounting rail.

CX8191 23Version: 1.0

Commissioning

5.2 Connecting the power supply

NOTE

Damage to the Embedded PCs

The Embedded PCs may be damaged during wiring.

• The cables for the power supply should only be connected in de-energized state.

The power supply terminals require an external voltage source, which provides 24VDC (-15% / +20%). The
power supply terminal must provide 4A at 24V, in order to ensure the operation of the Embedded PCs in all
situations.

The cabling of the Embedded PC in the control cabinet must be done in accordance with the standard EN
60204-1:2006 PELV = Protective Extra Low Voltage:

• The "PE" and "0V" conductors of the voltage source for a basic CPU module must be on the same
potential (connected in the control cabinet).

• Standard EN 60204-1:2006, section 6.4.1:b stipulates that one side of the circuit, or a point of the
energy source for this circuit must be connected to the protective earth conductor system.

Connection example

Table6: Legend for the connection example

No. Description

1 The upper spring-loaded terminals identified with "24V" and "0V" supply the Embedded

PC and the terminal bus (data transfer via K-bus or E-bus).

2 The spring-loaded terminals identified as "+", "-" and "PE" supply the Bus Terminals via

the power contacts and the sensors or actuators connected to the Bus Terminals.

CX819124 Version: 1.0

Commissioning

Opening and closing spring-loaded terminals:

The cables of an external voltage source are connected to the power supply unit with spring-loaded
terminals. Connect the cables as follows:

Table7: Required wire cross-sections and strip lengths

Wire cross-section 0.5 ... 2.5 mm

2

AWG 20 .. AWG 14

Strip length 8 ... 9 mm 0.33 inch

The voltage source has been connected to the power supply unit
successfully when the two upper power supply terminal LEDs light up in
green.

• The left LED (Us) indicates the supply of the basic CPU module and
terminal bus.

• The red LED (Up) indicates the Bus Terminal supply via the power
contacts.

NOTE

Interrupting / switching off the power supply

To switch off the Embedded PC, do not disconnect the ground (0 V), because otherwise current may con­tinue to flow via the shielding, depending on the device, and damage the Embedded PC or peripheral de­vices.

• Always disconnect the 24 V line. Devices connected to the Embedded PC, which have their own power
supply (e.g. a Panel) must have the same potential for "PE" and "0 V" as the Embedded PC have (no
potential difference).

Observe the UL requirements

The CX8191 Embedded PCs are UL certified. The corresponding UL label can be found on the type plate.

The CX8191 Embedded PCs can thus be used in areas in which special UL requirements have to be met.
These requirements apply to the system voltage (Us) and to the power contacts (Up). Application areas
without special UL requirements are not affected by UL regulations.

UL requirements

• The Embedded PCs must not be connected to unlimited voltage sources.

• Embedded PCs may only be supplied from a 24 V DC voltage source. The voltage source must be

insulated and protected with a fuse of maximum 4 A (corresponding to UL248).

• Or the power supply must originate from a voltage source that corresponds to NEC class 2. An NEC

class 2 voltage source must not be connected in series or parallel with another NEC class 2 voltage
source.

CX8191 25Version: 1.0

Configuration

6 Configuration

6.1 Operating system

The Microsoft Windows Embedded Compact 7 operating system is used on the CX8191 Embedded PC. This
operating system is optimized for the CX8191 Embedded PC. This means that not all features of Windows
Embedded Compact 7 are available.

Security

For reasons of security the CERHOST and TELNET services are deactivated in the delivery state. To
reactivate these services, you need a MicroSD card reader.

CERHOST

CERHOST is deactivated by current images on first start-up via the registry file
CeRemoteDisplay_Disable.reg, which is located in the folder RegFiles.

To reactivate CERHOST you have to delete the file CeRemoteDisplay_Disable.reg from the folder RegFiles
and also the folder Documents and Settings

Then reinsert the MicroSD card in the Embedded PC and reboot. The Embedded PC creates a new
Document and Settings directory and then reboots automatically.

The Embedded PC is then accessible again via CERHOST.

TELNET

TELNET is deactivated by current images on first start-up via the registry file Telnet_Disable.reg, which is
located in the folder RegFiles.

To reactivate TELNET you have to delete the file Telnet_Disable.reg from the folder RegFiles and also the
folder Documents and Settings.

Then reinsert the MicroSD card in the Embedded PC and reboot. The Embedded PC creates a new
Document and Settings directory and then reboots automatically.

CX819126 Version: 1.0

6.1.1 Features included

Features CX8191

ATL X

MFC X

XML DOM X

XML Minimal Parser X

COM X

DCOM X

COM Storage X

Winsock X

TCP/IP X

TCP/IPv6 X

Firewall X

Network Utilities (IpConfig, Ping, Route) X

Object Exchange Protocol OBEX -

Message Queuing MSMQ -

UPnP

Control Point -

Device Host X

SOAP

Client -

Server -

Server -

File Server (SMB/CIFS) X

FTP Server X

Print Server (SMB/CIFS) -

RAS Server / PPTP Server X

Simple Network Time Protocol (SNTP) X

SNTP Client Service X

Simple Network Management Protocol (SNMP) X

Telnet Server X

Web Server (HTTPD) / Active Server Pages (ASP)
Support / JScript 5.8 / VBScript 5.8

X

Configuration

Internet Explorer 7.0 -

NET Compact Framework v3.5

RDP Client (Remote Desktop protocol) -

CAB File Installer/Uninstaller X

CX8191 27Version: 1.0

Configuration

6.1.2 Update image

NOTE

Loss of data

All data on the MicroSD card will be deleted. Backup any data that you may have on the MicroSD card be­fore proceeding.

The new image will be copied directly to the MicroSD card in order to update the image of the Embedded
PC.

The new image is made available by Beckhoff Service. Perform the update only after consulting with
Beckhoff Service.

Requirements:

• Card reader for MicroSD cards.

Update the image as follows:

1. Switch the Embedded PC off and remove the MicroSD card from the Embedded PC.

2. Insert the MicroSD card into an external card reader and open the MicroSD card's folder tree.

3. Delete all files and folders on the MicroSD card.

4. Copy all files and folders of the new image to the empty MicroSD card.

5. Install the MicroSD card in the Embedded PC again.

6. Start the Embedded PC.

ð The Embedded PC is started and saves the current hardware configuration in the folder Documents and

Settings. The image has now been successfully updated.

CX819128 Version: 1.0

Configuration

6.1.3 FTP Server

Restricted access through firewall

From image version "CX8100_WEC7_LF_v604h_TC31_B4022.20", the firewall for the CX8191 is
enabled by default. This means that a passive FTP connection (as used by Microsoft, for example)
cannot be established. We therefore recommend using active FTP access. Enter TCP ports 20 and
21 in the firewall.

The File Transfer Protocol (FTP) is based exclusively on TCP-based communication connections. FTP
specifies two TCP ports, which are important for data transfer:

• Port 20/tcp: This port is also referred to as data port and is used to send/receive files and directory

lists.

• Port 21/tcp: This port is generally referred to as command port and is used to exchange status

information between the client and server.

Separate TCP connections are used for sending and receiving files (data port) and for transmitting
commands (command port). With FTP, two connection modes are available for setting up such connections:
"Active FTP" and "Passive FTP". Depending on the connection mode, the two ports mentioned above are
initiated differently, which is described in more detail below.

Active FTP

With active FTP, the client connects to the command port of the FTP server. The client uses a random port
N, e.g. 4242/tcp, as source port. The client then listens on port N+1 and notifies the server of this port. The
server then connects to the client on port N+1 and uses its data port as the source port.

A problem with active FTP is that the client itself does not establish a connection to the server's data port,
but communicates a port (N+1) to the server, which then connects to the client via its data port. In the case
of firewalls or NAT devices that are located upstream of the client, this could involve additional configuration
effort on the client side, since the data port of the client behind the firewall must be accessible to the server
(see figure "Connect 4243").

Passive FTP

This method is used when the client is not directly accessible by the server. This is the case, for example, if
the client is behind a firewall that uses NAT to rewrite the client's address. With passive FTP, the FTP client
initiates a connection via two random TCP ports N (command port) and N+1 (data port). The first port is used
to connect to the server's command port. However, instead of the client communicating its port N+1 to the
server so that the server can open a connection to it (see active FTP), the client first transmits a so-called
PASV command. The server now knows that the connection is via passive FTP. As a result, the server
opens a (random) port P as data port and transmits it to the client. The client then initiates a connection with
port P and uses port N+1 (data port) as the source port. This connection is then used to transfer the data.

CX8191 29Version: 1.0

Configuration

On closer examination it becomes apparent that the firewall problem of active FTP is reversed with passive
FTP. On the server side, the firewall should be configured such that the data port of the server can be
reached by the client. Many FTP servers offer the option to configure the data ports to be used.

CX819130 Version: 1.0

Configuration

6.2 IP address

6.2.1 Setting with DIP switches

You can set the IP address for the switched Ethernet interfaces X101/X102 with the DIP switches S101. The
DIP switches have no meaning for the Ethernet interface X001.

Fig.8: DIP switch S101, switches 1 to 10.

Right switch position: on "1".

Left switch position: off "0".

You can edit the last byte of the IP address with DIP switches 1 to 8. The DIP switches take priority over the
settings in the operating system. The changes are only accepted after restarting the Embedded PC.

Table8: Meaning of the DIP switch S101.

DIP switch S101 Meaning

10 on and 9 off. DHCP active. Standard setting ex factory.

The DIP switches 1 to 8 then have no meaning.

10 off and 9 off. DHCP inactive.

The fixed IP address 192.168.1.xxx and subnet mask 255.255.255.0
are used as standard.

The last byte of the IP address 192.168.1.xxx is edited with DIP
switches 1 to 8.

You can change the first three bytes of the IP address in the operating

system [}32] or via the web interface (Beckhoff Device Manager)
[}35]. You can edit the last byte of the IP address again with the DIP

switches.

10 off and 9 off

1 to 8 all on

The complete IP address is adopted from the operating system or the
web interface (Beckhoff Device Manager).

Example

If you wish to set the IP address for the Ethernet interface X101/X102 to 192.168.1.67 using the DIP
switches, you have to configure the DIP switches as follows:

DIP 1 DIP 2 DIP 3 DIP 4 DIP 5 DIP 6 DIP 7 DIP 8 DIP 9 DIP 10

On On Off Off Off Off On Off off off

The following value for the last byte of the IP address then results from the switched-on DIP switches:
20 + 21 + 26 = 67

Table9: Values for the individual DIP switches.

DIP 1 DIP 2 DIP 3 DIP 4 DIP 5 DIP 6 DIP 7 DIP 8

Value 2

0

1

2

2

2

3

2

4

2

5

2

6

2

7

2

CX8191 31Version: 1.0

Configuration

6.2.2 Setting in the operating system

The two Ethernet interfaces X001 and X101/X102 are displayed with Windows Embedded Compact 7 as
EMAC1 and TCCCATMP1.

Fig.9: Ethernet interfaces with Windows Embedded Compact 7.

EMAC1 (X001)

As standard, DHCP is active and the IP address is assigned automatically. You can deactivate DHCP and
assign a static IP address.

TCCCATMP1 (X101/102)

As standard the first three bytes of the IP address (standard: 192.168.1) are assigned in the operating
system. The last byte of the IP address (192.168.1.xxx) can be set using the DIP switches.

The DIP switches are set ex factory such that DHCP is active for the Ethernet interfaces (X101, X102). The
DIP switches take priority over the settings in the operating system. As a result, the settings in the operating
system or via the web interface are not adopted.

You have to set the DIP switches appropriately in order to set the last byte of the IP address in the operating
system. Set the DIP switches 10 and 9 to "off" and 1 to 8 to "on" so that the complete IP address is adopted
from the operating system.

EtherCAT interface

The EtherCAT interface is a further Ethernet interface that is not visible in the operating system for the IP
addressing.

CX819132 Version: 1.0

Configuration

6.3 Web service

6.3.1 Starting the Beckhoff Device Manager

Using the Beckhoff Device Manager, an Industrial PC can be configured by remote access with the aid of a
web browser. Depending on the image version, access takes place via different protocols and requires
different open ports. For older image versions access takes place via the HTTP protocol and Port 80 (TCP).
More up-to-date image versions use HTTPS and Port 443 (TCP).

Requirements:

• Host PC and Embedded PC must be located in the same network. Depending on the operating system

version, the network firewall must allow access via port 80 (HTTP) or port 443 (HTTPS).

• IP address or host name of the Embedded PC.

Table10: Access data for the Beckhoff Device Manager on delivery.

User name Password

Administrator 1

Start the Beckhoff Device Manager as follows:

1. Open a web browser on the host PC.

2. Enter the IP address or the host name of the Industrial PC in the web browser to start the Beckhoff
Device Manager.

• Example with IP address: https://169.254.136.237/config

• Example with host name: https://CX-16C2B8/config

3. Enter the user name and password. The start page appears:

ð Navigate forward in the menu and configure the Industrial PC. Note that modifications only become

active once they have been confirmed. It may be necessary to restart the Industrial PC.

CX8191 33Version: 1.0

Configuration

6.3.2 Enabling a remote display

So that you can remotely access an Industrial PC with CE operating system, you must first activate Remote
Display in the Beckhoff Device Manager. The remote display is disabled by default.

Requirements:

• Host PC and Embedded PC must be located in the same network. Depending on the operating system
version, the network firewall must allow access via port 80 (HTTP) or port 443 (HTTPS).

• The IP address or the host name of the Embedded PC must be known.

Table11: Access data for the Beckhoff Device Manager on delivery.

Operating system Access data

Windows Embedded Compact 7 User name: Administrator

Password: 1

Enable the remote display as follows:

1. Open a web browser on the host PC.

2. Enter the IP address or the host name of the Industrial PC in the web browser to start the Beckhoff
Device Manager.

• Example with IP address: https://169.254.136.237/config

• Example with host name: https://CX-16C2B8/config

3. Enter the user name and password. The start page appears.

4. In the menu under Device click on Boot Opt.

5. Under Remote Display select the option On and confirm the settings.

6. In the information window click OK to accept the settings.

ð You have successfully activated Remote Display on the Industrial PC. After restarting, you can remotely

access your Industrial PC.

CX819134 Version: 1.0

Configuration

6.3.3 Changing the IP address of the Ethernet interfaces (X101, X102)

DIP switches take priority

The DIP switches are set ex factory such that DHCP is active for the Ethernet interfaces (X101,
X102). As a result, the settings in the operating system or via the web interface are not adopted.
Deactivate DHCP using the DIP switches. Set the DIP switches 10 and 9 to "off" and 1 to 8 to "on"
so that the settings are adopted from the operating system or the web interface.

In this work step you will learn how to change the IP address of the Ethernet interface (X101, X102) via the
web interface (Beckhoff Device Manager).

Requirements:

• Set the DIP switches correctly so that the IP address is adopted completely from the operating system.

• Start the web interface (see: Starting the Beckhoff Device Manager).

Change the IP address as follows:

1. Click on Device and then on Connectivity.

2. Click on the wrench symbol to configure the network settings.

3. Change the network settings and assign a new IP address.

ð Save the settings to confirm all changes.

CX8191 35Version: 1.0

Configuration

6.3.4 Starting a remote connection

With the aid of the Remote Display Control program (CERHOST), a remote connection can be established
and an Industrial PC with CE operating system can be remotely controlled from a host PC.

Requirements:

• Remote Display is active. See: Enabling a remote display.

• Host name of the Embedded PC.

• Remote Display Control (CERHOST). Download under: https://infosys.beckhoff.com/content/1033/
CX8191_HW/Resources/zip/5047075211.zip

Start the remote connection as follows:

1. Unpack the zip file on the host PC and run cerhost.exe.

2. Click on File in the menu bar and then on Connect.

3. Enter the host name of the Embedded PC in the Hostname field.

ð The remote connection is started and the Windows Embedded CE 7 start screen appears.

CX819136 Version: 1.0

Configuration

6.4 TwinCAT

6.4.1 Connecting to the CX81xx

Before you can work with the CX81xx you must connect your local computer to the CX81xx (target system).
Then you can search for devices such as EtherCAT terminals with the help of the IP address or the host
name.

The local PC and the target system must be connected to the same network or directly to each other via an
Ethernet cable. In TwinCAT a search can be performed for all devices in this way and project planning
subsequently carried out.

Requirements for this step:

• TwinCAT 3 must be in Config mode.

• IP address or host name of the Embedded PC.

Establish a connection as follows:

1. In the menu at the top click on File > New > Project and create a new TwinCAT XAE project.

2. In the tree view on the left click on SYSTEM, and then Choose Target.

3. Click on Search (Ethernet).

4. Type the host name or the IP address of the device into the Enter Host Name / IP box and press
[Enter].

CX8191 37Version: 1.0

Configuration

5. Mark the device found and click on Add Route.

The Logon Information window appears.
Enter the user name and password for the CX in the User Name and Password fields and click OK.

The following information is set as standard in CX devices:
User name: Administrator Password: 1

6. If you do not wish to search for any further devices, click on Close to close the Add Route window.
The new device is displayed in the Choose Target System window.

7. Select the device you want to specify as target system and click OK.

ð You have successfully searched for a device in TwinCAT and inserted the device as the target system.

The new target system and the host name are displayed in the menu bar.

Using this procedure you can search for all available devices and also switch between the target systems
at any time. Next, you can append the device to the tree view in TwinCAT.

CX819138 Version: 1.0

Configuration

6.4.2 Scanning for devices

As soon as the CX81xx has been inserted as the target system in TwinCAT you can scan for further devices
and in this way, for example, insert all the EtherCAT Terminals or Bus Terminals connected to the CX81xx
into the TwinCAT tree view.

Requirements for this step:

• The CX81xx is connected as the target system to TwinCAT (see: Connecting to the CX81xx [}37]).

• TwinCAT 3 is in ConfigMode.

Scan for devices as follows:

1. In the tree view on the left, right-click on Devices under I/O.

2. In the context menu click on Scan.

3. Select the devices you want to use and confirm the selection with OK.

Depending on whether EtherCAT terminals or Bus Terminals are connected to the CX81xx, the K-bus
interface (Bus Terminals) or the EtherCAT interface (EtherCAT terminals) will be found.

4. Confirm the request with Yes, in order to look for boxes.

5. In the Scanning BACnet Clients window, select the devices to which you want to establish a BACnet
communication and click Add Clients.

6. Confirm the request whether to enable FreeRun with Yes.

ð The devices are created in the tree view. Depending on the connected terminals, either a Bus Coupler or

an EtherCAT coupler with the associated terminals will be displayed.

In the next step you can create a small program.

CX8191 39Version: 1.0

Configuration

6.4.3 Creating a BACnet server and a device object

This step shows how to create a BACnet server. Additionally, it shows how to create the device object for the
BACnet device and two FILE objects (configuration and persistence file).

Proceed as follows:

1. In the tree view on the left, right-click on BACnet IP Device.

2. Click on Add New Item in the context menu.

3. Select BACnet Server (Module) and confirm with OK.

The device object of the BACnet device and two FILE objects (configuration and persistence file) are
created.

4. Select the BACnet server in the tree view on the left and click the Settings tab.

CX819140 Version: 1.0

5. Then select EtherCAT/K-Bus AutoMapping and click the Map button.

Configuration

6. Confirm the settings in the IoBusMappingDialog window by clicking on Map.

ð BACnet objects of type Analog Input, Analog Output, Binary Input or Binary Output are created for each

of the four signal types: analog input, analog output, binary input and binary output

CX8191 41Version: 1.0

Configuration

6.4.4 Linking to IO task

In this step the functionality without a PLC project is demonstrated. If the terminals are connected to a PLC
project, this step is not required. In this case the terminals are addressed by the PLC task.

In order for the connected terminals to be addressed cyclically without a PLC project, the EtherCAT device,
in this example "Device 2", must be linked to an IO task.

Proceed as follows:

1. Click Add New Item under SYSTEM > Tasks on the left side of the tree view.

2. Assign a name to the task and select the option TwinCAT Task With Image.

3. Accept the default values for the task.

CX819142 Version: 1.0

4. Right-click Inputs on the left side of the tree view, then click Add New Item.

Configuration

5. Create a UINT variable with a size of two bytes.

6. Link the UINT variable to the EtherCAT device, in this example "Device 2“.

7. To do this, right-click on the created UINT variable in the tree view on the left, then click Change Link.

ð All variables of type UINT are available for selection.

CX8191 43Version: 1.0

Configuration

8. Now link the UINT variable to a variable of the EtherCAT device, e.g. SlaveCount.

9. Activate the configuration and restart the TwinCAT system when requested.

10. For the first binary output, click the Online tab and set the value under PresentValue to "active“. The
digital output is activated.

Alternatively, you can connect a switch to a digital input of the EL1004 terminal. When the switch is
operated, the value "active" appears under PresentValue of the BACnet object“.

ð This completes the sample configuration. If your PC has a network chipset from Intel, you can now

operate this PC as a BACnet client, scan the BACnet network, add the CX8191 and control the digital
output with the BACnet client. Ensure that you are in the same IP network.

CX819144 Version: 1.0

7 Programming

7.1 Seconds UPS

Loss of data

The use of the 1-second UPS outside of the documented possibilities can lead to loss or corruption
of data.
Use only TwinCAT to control the 1-second UPS and save only persistent data with a maximum size
of 1 MB.

The 1-second UPS is an UltraCap capacitor that continues to
supply the processor with power in the event of a power failure.

During this period persistent data can be saved, which are
available on switching on again.

Since the 1-second UPS is designed for the entire service life,
the holding time is considerably longer with new devices. The
capacitors age over the course of time and the holding time
decreases. Therefore a maximum of 1MB persistent data can
be reliably saved over the entire service life.

Do not save any other data and do not use any other
applications to control the 1-second UPS.

Programming

Please note that the 1-second UPS does not supply power to the K-bus or the E-bus and that their data may
already be invalid when the 1-second UPS is activated. Also, the fieldbus system (or Ethernet) may not work
or not work properly once the 1-second UPS was activated.

Storage location and names of the files:

The persistent data are saved by default in the TwinCAT boot directory:

Development environment File path File name

TwinCAT 3 \\TwinCAT\3.1\Boot\Plc Port_85x.bootdata

Port_85x.bootdata-old (backup)

The x in the file name stands for
the number of the runtime system.

Configure the 1-second UPS as follows in order to save persistent data:

• Declare important data such as counter values in the PLC as VAR PERSISTENT. Then call the
function block FB_S_UPS_CX81xx cyclically in TwinCAT with the fastest task in order to control the 1-

second UPS (see: Function block [}47]).

• Select the mode in the function block in order to specify what should happen in the case of a power
failure. Specify, for example, whether persistent data are saved and a quick shutdown is executed

(see: Data types [}49]).

• You can then check the validity of the variables and monitor whether the persistent variables are
loaded without error (see: PlcAppSystemInfo).

Components Version

TwinCAT on the development PC and on the control
system

TwinCAT 3.1 Build 4020.16 or higher

CX8191 45Version: 1.0

Programming

Saving and loading persistent data

The persistent data are saved in the Port_85x.bootdata file on the MicroSD card. On starting the PLC the
Port_85x.bootdata file is loaded from the MicroSD card, backed up there as Port_85x.bootdata_old (backup)
and then deleted.

Another current Port_85x.bootdata file is not written until the system is shut down or the 1-second UPS is
activated.

If no Port_85x.bootdata file exists when starting the Embedded PC, the persistent data are invalid and will be
deleted (standard setting). The reason for this is that the 1-second UPS was activated before the TwinCAT
PLC was started during startup of the Embedded PC. In this case no persistent data were saved, since the
system was unable to ensure sufficient buffer time for saving the data.

Always call the function block from the PLC and always use the fastest task to do so. In the case of a power
failure Beckhoff recommends not calling the rest of the application in order to ensure that sufficient time
remains for writing the data.

IF NOT FB_S_UPS_CX81xx.bPowerFailDetect THEN
;//Call programs and function blocks
END_IF

The rest of the application influences the CPU load and the CPU load in turn affects the period during which
the persistent data are written.

Loading a backup of the persistent data

A registry setting can be used to determine whether the backup file is deleted or used. The backup file is
used by default (setting 0):

[HKEY_LOCAL_MACHINE\SOFTWARE\Beckhoff\TwinCAT\Plc]"ClearInvalidPersistentData"= 0

If the backup file is to be deleted, the value of "ClearInvalidPersistentData" in the registry must be set to 1.

It is also possible in TwinCAT to specify on the left in the tree view under PLC > CX8190 whether the backup
file is to be used or not.

Fig.10: Loading a backup of the persistent data. Settings in TwinCAT 3.

The backup files will be deleted if the option Clear Invalid Persistent Data is activated. Corresponds to
registry entry 1.

CX819146 Version: 1.0

Programming

7.1.1 Function block

FUNCTION_BLOCK FB_S_UPS_CX81xx

The function block FB_S_UPS_CX81xx can be used on CX81xx devices with second UPS, in order to
control the second UPS from the PLC. This enables the persistent data to be saved according to the
selected mode in the event of a power failure. The default input values of the FB_S_UPS_CX81xx should be
retained.

The second UPS does not have sufficient capacity for bridging power failures. Saving can take place only on
MicroSD cards.

The 1-second UPS can be used only for a few seconds in the event of a power failure in order, to save
persistent data. The data must be saved in the fast “persistent mode” “SPDM_2PASS”, even though this can
lead to real-time violations. Make sure you configure adequate router memory for saving the persistent data.

Regardless of the mode and therefore irrespective of whether data were saved or a quick shutdown was
performed, the UPS switches off the mainboard after the capacitors have been discharged, even if the
voltage has returned in the meantime.

NOTE

Loss of data

If other applications or the PLC keep further files open or write to them, file errors may occur if the 1-second
UPS switches off the controller.

Function block modes

A QuickShutdown is performed automatically in the eSUPS_WrPersistData_Shutdown mode (standard
setting) after the storage of the persistent data.

In the eSUPS_WrPersistData_NoShutdown mode only the persistent data are saved, no QuickShutdown is
performed.

In eSUPS_ImmediateShutdown mode a quick shutdown is executed immediately, without saving data.

In the eSUPS_CheckPowerStatus mode only a check is performed as to whether a power failure has
occurred. If this is the case, the function block only switches back to the PowerOK state after the expiry of
tRecoverTime (10s).

VAR_INPUT

VAR_INPUT
sNetID:T_AmsNetId:='';(*''=localnetid*)
iPLCPort:UINT:=0;(*PLCRuntimeSystemforwritingpersistentdata*)
tTimeout:TIME:=DEFAULT_ADS_TIMEOUT;(*ADSTimeout*)
eUpsMode:E_S_UPS_Mode:=eSUPS_WrPersistData_Shutdown;(*UPSmode(w/
wowritingpersistentdata,w/woshutdown)*)
ePersistentMode:E_PersistentMode:=SPDM_2PASS;(*modeforwritingpersistentdata*)
tRecoverTime:TIME:=T#10s;(*ONtimetorecoverfromshortpowerfailureinmodeeSUPS_Wr
PersistData_NoShutdown/eSUPS_CheckPowerStatus*)
END_VAR

sNetID: AmsNetID of the controller (type: T_AmsNetID)

iPLCPort: Port number of the PLC runtime system (851 for the first PLC runtime system, 852 for the second

PLC runtime system, …). If no port number is specified, iPLCPortis0. The function block then automatically
determines the port of the PLC runtime system.

tTimeout: Timeout for writing of the persistent data or the quick shutdown.

CX8191 47Version: 1.0

Programming

eUpsMode: Defines whether persistent data are to be written and whether a quick shutdown is to be
executed. The default value is eSUPS_WrPersistData_Shutdown, i.e. a quick shutdown is executed
automatically once the persistent data have been saved. (Type: E_S_UPS_Mode)

ePersistentMode: Mode for the writing of the persistent data. Default value is SPDM_2PASS.

tRecoverTime: Time after which the UPS returns to PowerOK state in UPS modes without quick shutdown.

The tRecoverTime must be greater than the maximum charging time of the UPS, otherwise the UPS may
discharge too much in the event of short, consecutive power failures, which could result in the charge being
insufficient for storing the persistent data.

VAR_OUTPUT

VAR_OUTPUT
bPowerFailDetect:BOOL;(*TRUEwhilepowerfailureisdetected*)
eState:E_S_UPS_State:=eSUPS_PowerOK;(*currentupsstate*)
END_VAR

bPowerFailDetect: TRUE during power failure. FALSE if the supply voltage is present.

eState: Internal state of the function block (type: E_S_UPS_State)

VAR_GLOBAL

VAR_GLOBAL
eGlobalSUpsState:E_S_UPS_State;(*currentupsstate*)
END_VAR

eGlobalSUpsState: Internal state of the function block as global copy of VAR_OUTPUT

eState: For values see E_S_UPS_State

Requirements

Development environ­ment

Target platform Hardware PLC libraries to be

linked

TwinCAT v3.1 CX81xx Seconds UPS Tc2_SUPS

CX819148 Version: 1.0

Programming

7.1.2 Data types

E_S_UPS_Mode

eSUPS_WrPersistData_Shutdown:SchreibenderpersistentenDatenunddannQuickShutdown

eSUPS_WrPersistData_NoShutdown:NurSchreibenderpersistentenDaten(keinQuickShutdown)

eSUPS_ImmediateShutdown:NurQuickShutdown(keinSchreibenderpersistentenDaten)

eSUPS_CheckPowerStatus:NurStatusermitteln(wederSchreibenderPersistentenDatennochQuickShutd
own)

E_S_UPS_State

eSUPS_PowerOK:
inallenModi:VersorgungsspannungistOK

eSUPS_PowerFailure:
inallenModi:Versorgungsspannungfehlerhaft(stehtnureinenZyklusan)

eSUPS_WritePersistentData:
imModuseSUPS_WrPersistData_Shutdown:SchreibenderpersistentenDatenistaktiv
imModuseSUPS_WrPersistData_NoShutdown:SchreibenderpersistentenDatenistaktiv

eSUPS_QuickShutdown:
imModuseSUPS_WrPersistData_Shutdown:QuickShutdownistaktiv
imModuseSUPS_ImmediateShutdown:QuickShutdownistaktiv

eSUPS_WaitForRecover:
imModuseSUPS_WrPersistData_NoShutdown:WartenaufWiederkehrderSpannung
imModuseSUPS_CheckPowerStatus:WartenaufWiederkehrderSpannung

eSUPS_WaitForPowerOFF:
imModuseSUPS_WrPersistData_Shutdown:WartenaufdasAbschaltendurchdieUSV
imModuseSUPS_ImmediateShutdown:WartenaufdasAbschaltendurchdieUSV

Requirements

Development environ­ment

Target platform Hardware PLC libraries to be

linked

TwinCAT v3.1 CX81xx Seconds UPS Tc2_SUPS

CX8191 49Version: 1.0

Programming

7.1.3 PlcAppSystemInfo

Each PLC contains an instance of type 'PlcAppSystemInfo' with the name '_AppInfo'.

The corresponding namespace is 'TwinCAT_SystemInfoVarList'. This must be specified for use in a library,
for example.

TYPEPlcAppSystemInfo
STRUCT
ObjId:OTCID;
TaskCnt:UDINT;
OnlineChangeCnt:UDINT;
Flags:DWORD;
AdsPort:UINT;
BootDataLoaded:BOOL;
OldBootData:BOOL;
AppTimestamp:DT;
KeepOutputsOnBP:BOOL;
ShutdownInProgress: BOOL;
LicensesPending: BOOL;
BSODOccured: BOOL;

TComSrvPtr:ITComObjectServer;

AppName:STRING(63);
ProjectName:STRING(63);
END_STRUCT
END_TYPE

ObjId Object ID of the PLC project instance

TaskCnt Number of tasks in the runtime system

OnlineChangeCnt Number of online changes since the last complete download

Flags Reserved

AdsPort ADS port of the PLC application

BootDataLoaded PERSISTENT variables: LOADED (without error)

OldBootData PERSISTENT variables: INVALID (the back-up copy was loaded, since no

valid file was present)

AppTimestamp Time at which the PLC application was compiled

KeepOutputsOnBP The flag can be set and prevents that the outputs are zeroed when a

breakpoint is reached. In this case the task continues to run. Only the
execution of the PLC code is interrupted.

ShutdownInProgress This variable has the value TRUE if a shutdown of the TwinCAT system is in

progress. Some parts of the TwinCAT system may already have been shut
down.

LicensesPending This variable has the value TRUE if not all licenses that are provided by

license dongles have been validated yet.

BSODOccured This variable has the value TRUE if Windows is in a BSOD.

TComSrvPtr Pointer to the TcCOM object server

AppName Name generated by TwinCAT, which contains the port.

ProjectName Name of the project

CX819150 Version: 1.0

7.2 Function F_CX81xx_ADDRESS

VAR_INPUT

VAR_INPUT
iCX_Typ:INT;(* Use product code without ‘CX’ e.g.: CX8180 -> 8180 *)
END_VAR

VAR_OUTPUT

F_CX80xx_ADDRESS:INT;

F_CX80xx_ADDRESS : -1, non-implemented CX, address of the switch

Requirements

Programming

Development environ­ment

TwinCAT v3.1 Build

4022.30

Target platform Hardware PLC libraries to include

ARM CX8191 Tc2_SystemCX

7.3 Real Time Clock (RTC)

The real-time clock (RTC) is read out via the function blocks FB_LocalSystemTime and can be set with the
function block NT_SetLocalTime (see TcUtilities.lib). The RTC is supplied by the battery and can thus
continue to run in the power-off state.

Real-time clock (RTC) running too slow

TwinCAT uses its own real-time driver. This has the advantage that the quality of the real-time has been
much improved, and the jitter of the task has been reduced to a minimum. This calls the operating system
from TwinCAT. The RTC on the operating system is controlled via TwinCAT and must be called at certain
times.

If the task cycle time on the TwinCAT side is very long and the CPU load is high, the operating system is no
longer called with sufficient frequency. As a result, the RTC on the operating system is slow. If you have
noticed that the RTC is slow and the time on the CX8191 is also slow, you can apply the following
troubleshooting procedure.

Remedy

The call of the RTC is always linked to a reading of the hardware RTC. This has the disadvantage of a
slightly higher CPU load, but since the CPU load is already high due to your application, the additional CPU
load is negligible. Adjust the settings in the registry:

[HKEY_LOCAL_MACHINE\Platform]

“SoftRTC"=dword:0

Table12: Description of the SoftRTC registry key

Value Description

0 The hardware RTC is always read out when the Windows time is

requested.

1 The hardware RTC is read out once at startup. From then on, the

Windows clock continues to run via the internal system tick.

Standard setting: "SoftRTC"=dword:1

CX8191 51Version: 1.0

Ethernet X001 Interface

8 Ethernet X001 Interface

8.1 Ethernet

Ethernet was originally developed by DEC, Intel and XEROX (as the "DIX" standard) for passing data
between office devices. The term nowadays generally refers to the IEEE802.3 CSMA/CD specification,
published in 1985. Because of the high acceptance around the world this technology is available everywhere
and is very economical. This means that it is easy to make connections to existing networks.

There are now a number of quite different transmission media: coaxial cable (10Base5), optical fiber
(10BaseF) or twisted pairs (10BaseT) with shield (STP) or without shield (UTP). Using Ethernet, different
topologies can be built such as ring, line or star.

Ethernet transmits Ethernet packets from a sender to one or more receivers. This transmission takes place
without acknowledgement, and without the repetition of lost packets. To achieve reliable data
communication, there are protocols, such as TCP/IP, that can run on top of Ethernet.

MAC-ID

The sender and receiver of Ethernet packets are addressed by means of the MAC-ID. The MAC-ID is a 6­byte identification code unique to every Ethernet device in the world. The MAC-ID consists of two parts. The
first part (i.e. the first 3bytes) is a manufacturer identifier. The identifier for Beckhoff is 00 01 05. The next
3bytes are assigned by the manufacturer and implement a unique serial number. The MAC-ID can, for
example, be used for the BootP protocol in order to set the TCP/IP number. This involves sending a
telegram containing the information such as the name or the TCP/IP number to the corresponding node. You
can read the MAC-ID with the KS2000 configuration software.

The Internet Protocol (IP)

The internet protocol (IP) forms the basis of this data communication. IP transports data packets from one
device to another; the devices can be in the same network, or in different networks. IP here looks after the
address management (finding and assigning MAC-IDs), segmentation and routing. Like the Ethernet
protocol, IP does not guarantee that the data is transported - data packets can be lost, or their sequence can
be changed.

TCP/IP was developed to provide standardized, reliable data exchange between any numbers of different
networks. TCP/IP was developed to provide standardized, reliable data exchange between any numbers of
different networks. Although the term is often used as a single concept, a number of protocols are layered
together here: e.g. IP, TCP, UDP, ARP and ICMP.

Fig.11: Structure of the Ethernet protocol.

CX819152 Version: 1.0

Ethernet X001 Interface

Transmission Control Protocol (TCP)

The Transmission Control Protocol (TCP) which runs on top of IP is a connection-oriented transport protocol.
It includes error detection and handling mechanisms. Lost telegrams are repeated.

User Datagram Protocol (UDP)

UDP is connectionless transport protocol. It provides no control mechanism when exchanging data between
sender and receiver. This results in a higher processing speed than, for example, TCP. Checking whether or
not the telegram has arrived must be carried out by the higher-level protocol.

Protocols running on top of TCP/IP and UDP/IP

The following protocols can run on top of TCP/IP or UDP:

• ADS

• ModbusTCP

Both of these protocols are implemented in parallel on the Bus Coupler, so that no configuration is needed to
activate the protocols.

Fig.12: Protocols running on top of TCP/IP and UDP/IP.

ADS can be used on top of either TCP or UDP, but ModbusTCP is always based on TCP/IP.

CX8191 53Version: 1.0

Ethernet X001 Interface

8.2 Topology example

8.3 ADS-Communication

The ADS protocol (ADS: Automation Device Specification) is a transport layer within the TwinCAT system. It
was developed for data exchange between the different software modules, for instance the communication
between the NC and the PLC. This protocol enables communication with other tools from any point within
the TwinCAT. If it is necessary to communicate with another PC or device, the ADS protocol is used on top
of TCP/IP. Within a networked system it is thus possible to reach all data from any point.

Fig.13: The ADS protocol as a transport layer within TwinCAT.

The ADS protocol runs on top of the TCP/IP or UDP/IP protocols. It allows the user within the Beckhoff
system to use almost any connecting route to communicate with all the connected devices and to
parameterize them. Outside the Beckhoff system a variety of methods are available to exchange data with
other software tools.

Software interfaces

ADS-OCX

The ADS-OCX is an Active-X component. It offers a standard interface to, for instance, Visual Basic, Delphi,
etc.

CX819154 Version: 1.0

Ethernet X001 Interface

ADS-DLL

You can link the ADS-DLL (DLL: Dynamic Link Library) into your C program.

OPC

The OPC interface is a standardized interface for communication used in automation technology. Beckhoff
offer an OPC server for this purpose.

Protocol

The ADS functions provide a method for accessing the Bus Coupler information directly from the PC. ADS
function blocks can be used in TwinCAT for this. The function blocks are contained in the Tc2_System.lib
library. It is also equally possible to call the ADS functions from AdsOCX, ADSDLL or OPC.

Fig.14: Structure of the ADS communication.

AMSNetID

The AMSNetID provides a reference to the device that is to be addressed. This is taken from the MAC
address of the first Ethernet port (X001) and is printed on the side of the CX80xx. For the AMSNetID the
bytes 3..6 plus ".1.1" are typically used.
Example:
MAC address 00-01-05-01-02-03
AMSNetID 5.1.2.3.1.1

Port number

The port number distinguishes sub-elements in the connected device.
Port 851: local process data PLC runtime 1

Index group

The index group distinguishes different data within a port.

Index offset

Indicates the offset, from which reading or writing the byte is to start.

Len

Gives the length of the data, in bytes, that is to be read or written.

TCP port number

The TCP port number for the ADS protocol is 48898 or 0xBF02.

CX8191 55Version: 1.0

Error handling and diagnosis

9 Error handling and diagnosis

9.1 Diagnostic LEDs

Display LED Meaning

TC TwinCAT Status LED:

TwinCAT is in Run mode (green).
TwinCAT is in Stop mode (red).
TwinCAT is in Config mode (blue).

WD No function ex factory. The LED can be parameterized for user-specific

diagnostic messages (see: F_CX8190_LED_WD function).

ERR Lights up red when switching on. Software is being loaded. Goes off if

everything is OK.

The LED can be parameterized for user-specific diagnosis messages
(see: F_CX8190_LED_ERR function).

9.2 K-bus

The power supply unit checks the connected Bus Terminals for errors. The red LED "K-bus ERR" is off if no
error is present. The red LED "K-bus ERR" flashes if Bus Terminal errors are present.

Table13: Diagnostic LEDs in K-Bus mode.

Display LED Meaning

Us 24 V Power supply for basic CPU module. The LED lights green if the

power supply is correct.

Up 24V Power supply for terminal bus. The LED lights green if the power

supply is correct.

K-BUS RUN Diagnostic K-bus. The green LED lights up in order to indicate

fault-free operation. "Error-free" means that the communication
with the fieldbus system is also running.

K-BUS ERR Diagnostic K-bus. The red LED flashes to indicate an error. The

red LED blinks with two different frequencies.

The frequency and number of the flashes can be used to determine the error code and the error argument.
An error is indicated by the "K-bus ERR" LED in a particular order.

Table14: K-bus ERR LED, fault indication sequence through the LED.

Order Meaning

Fast blinking Starting the sequence

First slow sequence Error code

No display Pause, the LED is off

Second slow sequence Error code argument

Count how often the red LED K-bus ERR flashes, in order to determine the error code and the error
argument. In the error argument the number of pulses shows the position of the last Bus Terminal before the
error. Passive Bus Terminals, such as a power feed terminal, are not included in the count.

CX819156 Version: 1.0

Table15: K-BUS ERR LED, fault description and troubleshooting.

Error handling and diagnosis

Error code Error code argu-

ment

Persistent,
continuous
flashing

3 pulses 0 K-bus command error. • No Bus Terminal inserted.

4 pulses 0 K-bus data error, break

n Break behind Bus

5 pulses n K-bus error in register

6 pulses 0 Error at initialization. Replace Embedded PC.

1 Internal data error. Hardware reset of the Embedded PC

8 Internal data error. Hardware reset of the Embedded PC

7 pulses 0 Process data lengths of

Description Remedy

EMC problems. • Check power supply for undervoltage or

overvoltage peaks.

• Implement EMC measures.

• If a K-bus error is present, it can be
localized by a restart of the power supply
(by switching it off and then on again)

• One of the Bus Terminals is defective;
halve the number of Bus Terminals
attached and check whether the error is
still present with the remaining Bus
Terminals. Repeat this procedure until
the faulty Bus Terminal has been found.

Check whether the Bus End Terminal 9010
behind the power supply
unit.

Terminaln

communication with Bus
Terminal n.

the set and actual
configurations do not
correspond.

is connected.

Check whether Bus Terminal n+1 after the

power supply unit is connected correctly;

replace if necessary.

Replace Bus Terminal at location n.

(switch off and back on again).

(switch off and back on again).

Check the configuration and the Bus

Terminals for consistency.

For some error the LED "K-BUS ERR" does not go out, even if the error was rectified. Switch the power
supply for the power supply unit off and back on again to switch off the LED after the error has been rectified.

CX8191 57Version: 1.0

Error handling and diagnosis

State variable

In TwinCAT there is a State variable under the Bus Coupler for K-bus diagnostics.

Fig.15: Status variable for error handling and diagnostics under TwinCAT.

If the value is "0", the K-bus operates synchronous and without error. If the value is <> "0" there may be a
fault, or it may only be an indication that the K-bus cycle is longer than the task. In which case it would no
longer be synchronous with the task. The task time should be faster than 100 ms. We recommend a task
time of less than 50 ms. The K-bus update time typically lies between one and five ms.

Table16: Description of the State variable values.

Bit Description

Bit 0 K-bus error.

Bit 1 Terminal configuration has changed since the start.

Bit 2 Process image lengths do not match.

Bit 8 (still) no valid inputs.

Bit 9 K-bus input update not yet complete.

Bit 10 K-bus output update not yet complete.

Bit 11 Watchdog.

Bit 15 Acyclic K-bus function active (e.g. K-bus reset).

If there is a K-bus error, this can be reset via the IOF_DeviceReset function block (in the TcIoFunctions.lib).

CX819158 Version: 1.0

Error handling and diagnosis

9.3 E-bus

The power supply unit checks the connected EtherCAT Terminals. The "L/A" LED is lit in E-bus mode. The
"L/A" LED flashes during data transfer.

Table17: Diagnostic LEDs in K-Bus mode.

Display LED Meaning

Us 24 V Power supply for basic CPU module. The LED lights

green if the power supply is correct.

Up 24 V Power supply for terminal bus. The LED lights green if

the power supply is correct.

L / A off E-bus not connected.

on E-bus connected / no data traffic.

flashes E-bus connected / data traffic on the E-bus.

CX8191 59Version: 1.0

Care and maintenance

10 Care and maintenance

10.1 Replace the battery

NOTE

Risk of explosion

An incorrectly inserted battery may explode and damage the Embedded PC.

Only use original batteries and ensure that the positive and negative poles are inserted correctly.

The battery must be replaced every 5 years. Spare batteries can be ordered from Beckhoff Service. A
battery of type CR2032 is used for the Embedded PC.

Table18: Technical data of the battery.

Battery type Electrical properties (at

20°C)

nominal volt-

age

CR2032 3.0V 225 mAh 0.20 mA 20.0 mm 3.20 mm

The battery compartment is below the front flap. The battery stores the time and date. The time and date are
reset if the battery is removed.

Be aware of this behavior for your hardware and software configuration and reset the time and date after a
battery change.

Requirements:

• The Embedded PC is switched off.

Replace the battery as follows:

1. Open the front flap.

2. Apply the screwdriver below or above the battery and prize the battery carefully out of the battery
compartment.

nominal
capacity

Standard

load

continuous

load

Dimensions

Diameter Height

3. Push the new battery into the battery compartment. The plus pole points to the left towards the Ethernet
interfaces.

ð The battery change is complete. Close the front flap and reset the date and time.

CX819160 Version: 1.0

Technical data

11 Technical data

Table19: Technical data, dimensions and weights.

CX8191

Dimensions (W x H x D) 71 mm x 100 mm x 73 mm

Weight 230g

Table20: Technical data, general data.

Technical data CX8191

Processor ARM Cortex™-A9, 800 MHz 32-bit

Main memory 512 MB DDR3-RAM

Flash memory MicroSD card (ATP) 512 MB (optionally 1, 2, 4, 8 GB)

Interfaces 1 x RJ45 10/100 MBit/s

Bus interface 2 x RJ45 (switched)

Protocol BACnet (client and server) according to ISO 16484-5:2012 (Revision

14)

Persistent memory 1-second UPS integrated

Power supply 24VDC (-15%/+20%)

Max. power consumption 4W

Max. power consumption (with
UPS charging)

Dielectric strength 500V (supply / internal electronics)

Operating system Microsoft Windows Embedded Compact 7

Control software TwinCAT 3, licenses not included

Diagnostic LED 1 x TC Status, 1 x WD LED, 1 x ERR LED

Clock internal battery-backed clock (RTC) for time and date (battery

Approvals CE, UL

9W

exchangeable)

Table21: Technical data, I/O terminals.

Technical data CX8191

I/O connection via power supply terminal (E-bus or K-bus, automatic recognition)

Power supply for I/O terminals max. 2 A

Power contacts current loading max. 10 A

Process data on the K-bus max. 2kB in and 2kB out

max. number of terminals (K-bus) 64 (255 with K-bus extension)

max. number of terminals (E-bus) up to 65534 terminals.

Table22: Technical data, environmental conditions.

Technical data CX8191

Ambient temperature during
operation

Ambient temperature during
storage

Relative humidity 95% no condensation

Vibration resistance conforms to EN 60068-2-6

Shock resistance conforms to EN 60068-2-27

EMC immunity conforms to EN 61000-6-2

EMC emission conforms to EN 61000-6-4

Protection class IP20

-25 °C to +60 °C

-40 °C ... +85 °C
see notes under: Transport and storage [}10]

CX8191 61Version: 1.0

Technical data

Table23: Technical data, Ethernet interface X001.

Technical data Description

Data transfer medium 4 x 2 twisted pair copper cables category 5 (100 MBit/s)

Cable length 100 m from switch to CX8191

Data transfer rate 10/100 MBit/s

Topology star wiring

Protocols all non-real-time-capable protocols that are based on TCP or UDP and

require no real-time extension

Table24: Technical data, Ethernet interfaces X101/X102.

Technical data Description

Data transfer medium 4 x 2 twisted pair copper cables category 5 (100 MBit/s)

Cable length 100 m from switch to CX8191

Data transfer rate 100 Mbit/s

Topology star wiring, line topology

Protocols BACnet (client and server) according to ISO 16484-5:2012 (Revision

14)

CX819162 Version: 1.0

Appendix

12 Appendix

12.1 Certification

12.1.1 FCC

FCC Approvals for the United States of America

FCC: Federal Communications Commission Radio Frequency Interference Statement

This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to
Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This equipment generates, uses,
and can radiate radio frequency energy and, if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference in which case the user will be required to correct the
interference at his own expense.

FCC Approval for Canada

FCC: Canadian Notice

This equipment does not exceed the Class A limits for radiated emissions as described in the Radio
Interference Regulations of the Canadian Department of Communications.

CX8191 63Version: 1.0

Appendix

12.2 Support and Service

Beckhoff and their partners around the world offer comprehensive support and service, making available fast
and competent assistance with all questions related to Beckhoff products and system solutions.

Beckhoff's branch offices and representatives

Please contact your Beckhoff branch office or representative for local support and service on Beckhoff
products!

The addresses of Beckhoff's branch offices and representatives round the world can be found on her internet
pages: https://www.beckhoff.com

You will also find further documentation for Beckhoff components there.

Beckhoff Support

Support offers you comprehensive technical assistance, helping you not only with the application of
individual Beckhoff products, but also with other, wide-ranging services:

• support

• design, programming and commissioning of complex automation systems

• and extensive training program for Beckhoff system components

Hotline: [phone]
Fax: [phone]
e-mail: [e-mail]

Beckhoff Service

The Beckhoff Service Center supports you in all matters of after-sales service:

• on-site service

• repair service

• spare parts service

• hotline service

Hotline: [phone]
Fax: [phone]
e-mail: [e-mail]

Beckhoff Headquarters

Beckhoff Automation GmbH & Co. KG

Huelshorstweg 20
33415 Verl
Germany

Phone: [phone]
Fax: [phone]
e-mail: [e-mail]
web:

https://www.beckhoff.com

CX819164 Version: 1.0

List of tables

List of tables

Table 1 Dimensions and weight of the CX8191 Embedded PC. .............................................................. 10

Table 2 Legend for the configuration. ....................................................................................................... 13

Table 3 Legend for the name plate........................................................................................................... 14

Table 4 Ethernet interface X001, pin assignment..................................................................................... 15

Table 5 Ethernet interfaces X101 and X102, pin assignment................................................................... 15

Table 6 Legend for the connection example............................................................................................. 24

Table 7 Required wire cross-sections and strip lengths ........................................................................... 25

Table 8 Meaning of the DIP switch S101.................................................................................................. 31

Table 9 Values for the individual DIP switches......................................................................................... 31

Table 10 Access data for the Beckhoff Device Manager on delivery. ........................................................ 33

Table 11 Access data for the Beckhoff Device Manager on delivery. ........................................................ 34

Table 12 Description of the SoftRTC registry key....................................................................................... 51

Table 13 Diagnostic LEDs in K-Bus mode.................................................................................................. 56

Table 14 K-bus ERR LED, fault indication sequence through the LED. ..................................................... 56

Table 15 K-BUS ERR LED, fault description and troubleshooting. ............................................................ 57

Table 16 Description of the State variable values. ..................................................................................... 58

Table 17 Diagnostic LEDs in K-Bus mode.................................................................................................. 59

Table 18 Technical data of the battery. ...................................................................................................... 60

Table 19 Technical data, dimensions and weights. .................................................................................... 61

Table 20 Technical data, general data. ...................................................................................................... 61

Table 21 Technical data, I/O terminals. ...................................................................................................... 61

Table 22 Technical data, environmental conditions.................................................................................... 61

Table 23 Technical data, Ethernet interface X001...................................................................................... 62

Table 24 Technical data, Ethernet interfaces X101/X102. ......................................................................... 62

CX8191 65Version: 1.0

List of figures

List of figures

Fig. 1 Sample configuration of a CX8191 Embedded PC...................................................................... 13

Fig. 2 CX8191 name plate. .................................................................................................................... 14

Fig. 3 Ethernet interface X001, X101, X102. ......................................................................................... 15

Fig. 4 Dimensions of the CX81xx Embedded PC. ................................................................................ 20

Fig. 5 Embedded PC CX8191, horizontal installation position. ............................................................. 21

Fig. 6 Embedded PC CX8191, vertical installation position................................................................... 22

Fig. 7 Embedded PC CX8191, horizontal installation position. ............................................................. 22

Fig. 8 DIP switch S101, switches 1 to 10............................................................................................... 31

Fig. 9 Ethernet interfaces with Windows Embedded Compact 7........................................................... 32

Fig. 10 Loading a backup of the persistent data. Settings in TwinCAT 3. ............................................... 46

Fig. 11 Structure of the Ethernet protocol................................................................................................ 52

Fig. 12 Protocols running on top of TCP/IP and UDP/IP. ........................................................................ 53

Fig. 13 The ADS protocol as a transport layer within TwinCAT............................................................... 54

Fig. 14 Structure of the ADS communication........................................................................................... 55

Fig. 15 Status variable for error handling and diagnostics under TwinCAT............................................. 58

CX819166 Version: 1.0

More Information:

www.beckhoff.com/CX8191

Beckhoff Automation GmbH & Co. KG
Hülshorstweg 20
33415 Verl
Germany
Phone: [phone]
[e-mail]
www.beckhoff.com