turck BL20-GW-CANOPEN, BL20-GWBR-CANOPEN User Manual

BL20 –

USER MANUAL
FOR
CANopen

All brand and product names are trademarks or registered trade marks of the owner
concerned.

Edition 12/20

© Hans Tu

All rights reserved, including those of the translation.

No part of this manual may be reproduced in any form (printed, photocopy, microfilm or any
other process) or processed, duplicated or distributed by means of electronic systems
without written permission of Hans Turck GmbH & Co. KG, Muelheim an der Ruhr.

Subject to alterations without notice

11

rck GmbH, Muelheim an der Ruhr

Safety Notes!

Before starting the installation

 Disconnect the power supply of the device.

 Ensure that devices cannot be accidentally restarted.

 Verify isolation from the supply.

 Earth and short circuit.

 Cover or enclose neighboring units that are live.

 Follow the engineering instructions (AWA) of the device concerned.

 Only suitably qualified personnel in accordance with EN 50 110-1/-2 (VDE 0 105 Part 100) may

work on this device/system.

 Before installation and before touching the device ensure that you are free of electrostatic

charge.

 The functional earth (FE) must be connected to the protective earth (PE) or to the potential equa-

lization. The system installer is responsible for implementing this connection.

 Connecting cables and signal lines should be installed so that inductive or capacitive interfe-

rence do not impair the automation functions.

 Install automation devices and related operating elements in such a way that they are well

protected against unintentional operation.

 Suitable safety hardware and software measures should be implemented for the I/O interface so

that a line or wire breakage on the signal side does not result in undefined states in the automa­tion devices.

 Ensure a reliable electrical isolation of the low voltage for the 24 volt supply. Only use power

supply units complying with IEC 60 364-4-41 (VDE 0 100 Part 410) or HD 384.4.41 S2.

 Deviations of the mains voltage from the rated value must not exceed the tolerance limits given

in the specifications, otherwise this may cause malfunction and dangerous operation.

 Emergency stop devices complying with IEC/EN 60 204-1 must be effective in all operating

modes of the automation devices. Unlatching the emergency-stop devices must not cause
restart.

 Devices that are designed for mounting in housings or control cabinets must only be operated

and controlled after they have been installed with the housing closed. Desktop or portable units
must only be operated and controlled in enclosed housings.

 Measures should be taken to ensure the proper restart of programs interrupted after a voltage

dip or failure. This should not cause dangerous operating states even for a short time. If neces­sary, emergency-stop devices should be implemented.

 Wherever faults in the automation system may cause damage to persons or property, external

measures must be implemented to ensure a safe operating state in the event of a fault or
malfunction (for example, by means of separate limit switches, mechanical interlocks etc.).

 The electrical installation must be carried out in accordance with the relevant regulations (e. g.

with regard to cable cross sections, fuses, PE).

 All work relating to transport, installation, commissioning and maintenance must only be carried

out by qualified personnel. (IEC 60 364 and HD 384 and national work safety regulations).

 All shrouds and doors must be kept closed during operation.

Table of Contents

1 About this Manual

1.1 Documentation Concept.................................................................................................................................1-2

1.2 Description of Symbols Used..........................................................................................................................1-3

1.3 Overview ..........................................................................................................................................................1-4

1.3.1 Prescribed Use .........................................................................................................................................................................................1-4

1.3.2 Notes Concerning Planning /Installation of this Product ........................................................................................................1-4

1.4 List of Revisions ...............................................................................................................................................1-5

2 BL20 Philosophy

2.1 The Basic Concept............................................................................................................................................2-2

2.2 BL20 Components ...........................................................................................................................................2-3

2.2.1 Gateways ...................................................................................................................................................................................................2-3

2.2.2 Power Distribution Modules .............................................................................................................................................................. 2-3

2.2.3 Electronics Modules ..............................................................................................................................................................................2-4

2.2.4 Base Modules ...........................................................................................................................................................................................2-5

2.2.5 End Plate....................................................................................................................................................................................................2-7

2.2.6 End Bracket...............................................................................................................................................................................................2-7

2.2.7 Jumpers...................................................................................................................................................................................................... 2-8

2.2.8 Marking Material.....................................................................................................................................................................................2-8

2.2.9 Shield Connection, 2-Pole for Analog Modules ..........................................................................................................................2-9

3 Short description of CANopen

3.1 CANopen ..........................................................................................................................................................3-2

3.1.1 General .......................................................................................................................................................................................................3-2

3.1.2 Communication ...................................................................................................................................................................................... 3-3

3.2 BL20 and CANopen..........................................................................................................................................3-5

3.3 Electronic data sheet – EDS file ......................................................................................................................3-6

4 BL20 - Gateway for CANopen

4.1 Introduction .....................................................................................................................................................4-2

4.2 Function ...........................................................................................................................................................4-3

4.3 Technical Information .....................................................................................................................................4-4

4.4 Technical Data .................................................................................................................................................4-5

4.4.1 General Technical Data ........................................................................................................................................................................4-5

4.4.2 Structure Diagram of a Gateway.......................................................................................................................................................4-8

4.4.3 Technical Data BL20-GW-CANOPEN................................................................................................................................................4-8

4.4.4 Technical Data BL20-GWBR-CANOPEN ..........................................................................................................................................4-9

4.5 Connections for data cables to BL20-GW-CANOPEN ................................................................................. 4-10

4.5.1 Fieldbus connection via SUB-D socket ........................................................................................................................................ 4-10

4.5.2 Fieldbus connection through direct wiring............................................................................................................................... 4-10

4.6 Connections of the data cables to BL20-GWBR-CANopen ........................................................................ 4-12

4.6.1 Fieldbus connection via Open Style connector ....................................................................................................................... 4-12

D301087 1211 - BL20 CANopen

i

4.6.2 Service Interface Connection ..........................................................................................................................................................4-14

4.7 Setting the bit transfer rate through DIP-switches.................................................................................... 4-15

4.8 Node-ID Setting ............................................................................................................................................ 4-17

4.9 Acceptance of the BL20 Station Configuration .......................................................................................... 4-19

4.10 Status Indicators/ Diagnostic Messages Gateway ..................................................................................... 4-20

4.10.1 Diagnostic Messages via LEDs ........................................................................................................................................................4-20

5 BL20 - Communication in CANopen

6 Guidelines for Station Planning

6.1 Random Module Arrangement ...................................................................................................................... 6-2

6.1.1 Complete Planning ............................................................................................................................................................................... 6-2

6.1.2 Maximum System Extension ............................................................................................................................................................. 6-2

6.2 Power Supply .................................................................................................................................................. 6-4

6.2.1 Gateway Supply...................................................................................................................................................................................... 6-4

6.2.2 Module Bus Refreshing ........................................................................................................................................................................ 6-4

6.2.3 Creating Potential Groups .................................................................................................................................................................. 6-8

6.2.4 Protecting the Service Interface on the Gateway ...................................................................................................................... 6-8

6.2.5 C-Rail (Cross Connection).................................................................................................................................................................... 6-9

6.2.6 Direct Wiring of Relay Modules ...................................................................................................................................................... 6-10

6.3 Plugging and Pulling Electronics Modules ................................................................................................. 6-11

6.4 Extending an Existing Station...................................................................................................................... 6-12

6.5 Firmware Download ..................................................................................................................................... 6-13

7 Guidelines for Electrical Installation

7.1 General Notes.................................................................................................................................................. 7-2

7.1.1 General ...................................................................................................................................................................................................... 7-2

7.1.2 Cable Routing.......................................................................................................................................................................................... 7-2

7.1.3 Cable Routing Inside and Outside of Cabinets: .......................................................................................................................... 7-2

7.1.4 Lightning Protection ............................................................................................................................................................................ 7-3

7.1.5 Transmission Cables ............................................................................................................................................................................. 7-3

7.1.6 Cable Types .............................................................................................................................................................................................. 7-3

7.2 Potential Relationships .................................................................................................................................. 7-4

7.2.1 General ...................................................................................................................................................................................................... 7-4

7.2.2 Potential-Free Installation .................................................................................................................................................................. 7-4

7.2.3 Non-isolated Installation ..................................................................................................................................................................... 7-4

7.3 Electromagnetic Compatibility (EMC) ........................................................................................................... 7-5

7.3.1 Ensuring Electromagnetic Compatibility ...................................................................................................................................... 7-5

7.3.2 Grounding of Inactive Metal Components................................................................................................................................... 7-5

7.3.3 PE Connection......................................................................................................................................................................................... 7-5

7.3.4 Earth-Free Operation ............................................................................................................................................................................ 7-5

7.3.5 Mounting Rails ........................................................................................................................................................................................ 7-6

7.3.6 EMC Compliant Cabinet Installation ............................................................................................................................................... 7-7

7.4 Shielding of cables.......................................................................................................................................... 7-8

7.5 Potential Compensation ................................................................................................................................ 7-9

D301087 1211 - BL20 CANopenii

7.5.1 Switching Inductive Loads ............................................................................................................................................................... 7-10

7.5.2 Protection against Electrostatic Discharge (ESD) .................................................................................................................... 7-10

7.6 Bus Connection............................................................................................................................................. 7-11

7.7 Two-Pole Shield Connection........................................................................................................................ 7-12

8 BL20-Approvals for Zone 2/ Division 2

9Glossary

10 Index

D301087 1211 - BL20 CANopen

iii

D301087 1211 - BL20 CANopeniv

1 About this Manual

1.1 Documentation Concept ................................................................................................................... 2

1.2 Description of Symbols Used ............................................................................................................ 3

1.3 Overview ........................................................................................................................................... 4

1.3.1 Prescribed Use............. ....................................... ... ... ... .... ... ....................................... . .........................4

1.3.2 Notes Concerning Planning /Installation of this Product......................................................................4

1.4 List of Revisions ................................................................................................................................ 5

D301087 1211 - BL20 CANopen 1-1

About this Manual

1.1 Documentation Concept

This manual contains all information about the BL20-gateway for CANopen (BL20-GW-CANOPEN,
BL20-GWBR-CANOPEN).

The following chapters contain a short BL20 system description, a description of the field bus system
CANopen, exact information about function and structure of the BL20 CANopen-gateway as well as all
bus-specific information concerning the connection to automation devices, the maximum system
extension etc.

The bus-independent I/O-modules for BL20 as well as all further fieldbus-independent chapters like
mounting, labelling etc. are described in a separate manual.

 BL20 I/O-modules (TURCK-Documentation-No.: English D300717)

Furthermore, the manual contains a short description of the project planning and diagnostics software
for TURCK I/O-systems, the software I/O-ASSISTANT.

D301087 1211 - BL20 CANopen1-2

Description of Symbols Used

1.2 Description of Symbols Used

Danger

This sign can be found next to all notes that indicate a source of hazards. This can refer to
danger to personnel or damage to the system (hardware and software) and to the facility.

This sign means for the operator: work with extreme caution.

Attention

This sign can be found next to all notes that indicate a potential hazard.

This can refer to possible danger to personnel and damages to the system (hardware and
software) and to the facility.

Note

This sign can be found next to all general notes that supply important information about one
or more operating steps. These specific notes are intended to make operation easier and
avoid unnecessary work due to incorrect operation.

D301087 1211 - BL20 CANopen

1-3

About this Manual

1.3 Overview

This manual includes all information necessary for the prescribed use of BL20 products. It has been
specially conceived for personnel with the necessary qualifications.

1.3.1 Prescribed Use

Attention

Please read this section carefully. Safety aspects cannot be left to chance when dealing with
electrical equipment.

Danger

The devices described in this manual must be used only in applications prescribed in this
manual or in the respective technical descriptions, and only with certified components and
devices from third party manufacturers.

Appropriate transport, storage, deployment and mounting as well as careful operating and thorough
maintenance guarantee the trouble-free and safe operation of these devices.

1.3.2 Notes Concerning Planning /Installation of this Product

Danger

All respective safety measures and accident protection guidelines must be considered
carefully and without exception.

D301087 1211 - BL20 CANopen1-4

List of Revisions

1.4 List of Revisions

In comparison to the previous manual edition, the following changes/ revisions have been made:

Table 1-1:
List of revisions

Chapter Subject/Description new changed deleted

5/6 BL20 - Communication in CANopen/ Diagnostics -

X
Emergency Frames
→ seperate manual D301230

8 BL20-Approvals for Zone 2/ Division 2

X

→ seperate manual D301255

Note

The publication of this manual renders all previous editions invalid.

D301087 1211 - BL20 CANopen

1-5

About this Manual

D301087 1211 - BL20 CANopen1-6

2 BL20 Philosophy

2.1 The Basic Concept ............................................................................................................................. 2

2.2 BL20 Components ............................................................................................................................. 3

2.2.1 Gateways..............................................................................................................................................3

– Gateways with integrated power supply...........................................................................................3

– Gateways without power supply ........................................................... .... ... ....................................3

2.2.2 Power Distribution Modules .................................................................................................................3

2.2.3 Electronics Modules .............................................................................................................................4

2.2.4 Base Modules.......................................................................................................................................5

2.2.5 End Plate ..............................................................................................................................................7

2.2.6 End Bracket..........................................................................................................................................7

2.2.7 Jumpers................................................................................................................................................8

2.2.8 Marking Material...................................................................................................................................8

2.2.9 Shield Connection, 2-Pole for Analog Modules ........................ ....................................... ... ... .... ... .......9

D301087 1211 - BL20 CANopen 2-1

BL20 Philosophy

2.1 The Basic Concept

BL20 is a modular I/O system for use in industrial automation. It connects the sensors and actuators in
the field with the higher-level master.

BL20 offers modules for practically all applications:

 Digital input and output modules

 Analog input and output modules

 Technology modules (counters, RS232 interface...)

A complete BL20 station counts as one station on the bus and therefore occupies one fieldbus address
in any given fieldbus structure. A BL20 station consists of a gateway, power distribution modules and I/
O modules.

The connection to the relevant fieldbus is made via the bus-specific gateway, which is responsible for
the communication between the BL20 station and the other fieldbus stations.

The communication within the BL20 station between the gateway and the individual BL20 modules is
regulated via an internal module bus.

Note

The gateway is the only fieldbus-dependent module on a BL20 station. All other BL20
modules are not dependent on the fieldbus used.

Flexibility

All BL20 stations can be planned to accommodate the exact number of channels to suit your needs,
because the modules are available in block and slice design.

A BL20 station can contain modules in any combination, which means it is possible to adapt the system
to practically all applications in automated industry.

Compactness

The slim design of the BL20 modules (gateway 50.4 mm / 1.98 inch, slice 12.6 mm / 0.49 inch and block

100.8 mm / 3.97 inch) and their low overall height favor the installation of this system in confined
spaces.

Easy to handle

All BL20 modules, with the exception of the gateway, consist of a base module and an electronics
module.

The gateway and the base modules are snapped onto a mounting rail. The electronics modules are
plugged onto the appropriate base modules.

The base modules are designed as terminal blocks. The wiring is secured by tension clamp or screw
connection. The electronics modules can be plugged or pulled when the station is being commissioned
or for maintenance purposes, without having to disconnect the field wiring from the base modules.

D301087 1211 - BL20 CANopen2-2

BL20 Components

2.2 BL20 Components

For a detailed explanation of the individual BL20 components, please refer to chapter 2 and chapter 4.
The "Appendix" to this manual contains (amongst others) a list of all BL20 components and the
assignment of electronics modules to base modules.

2.2.1 Gateways

The gateway connects the fieldbus to the I/O modules. It is responsible for handling the entire process
data and generates diagnostic information for the higher-level master and the software tool
I/Oassistant.

Gateways with integrated power supply

The BL20 gateway BL20-GWBR-CANOPEN offers an integrated power supply unit for feeding the
gateway and the connected I/O modules.

It is not necessary to supply each individual module with a separate voltage

Figure 2-1:
Gateway
BL20-GWBR­CANOPEN

Gateways without power supply

Note

The gateways without integrated power supply unit need an additional power supply
module (bus refreshing module) which feeds the gateway an the connected I/O modules.

2.2.2 Power Distribution Modules

D301087 1211 - BL20 CANopen

2-3

BL20 Philosophy

Figure 2-2:
Power distribu­tion module

The power supply for gateways and I/O modules is fed to the power distribution modules; therefore, it
is not necessary to supply each individual module with a separate voltage.

2.2.3 Electronics Modules

Electronics modules contain the functions of the BL20 modules (power distribution modules, digital
and analog input/output modules, and technology modules).

Electronics modules are plugged onto the base modules and are not directly connected to the wiring.
The assignment table in the Section "Ordering Information" of the "Appendix" shows the possible
combinations of electronics and base modules. They can be plugged or pulled when the station is
being commissioned or for maintenance purposes, without having to disconnect the field wiring from
the base modules.

Figure 2-3:
Electronics
module in slice
design

D301087 1211 - BL20 CANopen2-4

BL20 Components

Figure 2-4:
Electronics
module in block
design

2.2.4 Base Modules

The field wiring is connected to the base modules. These are constructed as terminals in block and slice
designs and are available in the following variations with either tension clamp or screw connections: 2­/3-wire (2-channel), 4-wire (2-channel) and 4x 2-/3-wire (4-channel).

The assignment table in the Section "Ordering Information" of the "Appendix" shows the possible
combinations of electronics and base modules.

Figure 2-5:
Base module with
tension clamp
connection

D301087 1211 - BL20 CANopen

2-5

BL20 Philosophy

Figure 2-6:
Base module with
screw connection

Figure 2-7:
Base module in
block design

D301087 1211 - BL20 CANopen2-6

BL20 Components

2.2.5 End Plate

An end plate on the right-hand side physically completes the BL20 station. An end bracket mounted
into the end plate ensures that the BL20 station remains secure on the mounting rail even when
subjected to vibration.

Figure 2-8:
End plate

2.2.6 End Bracket

A second end bracket to the left of the gateway is necessary, as well as the one mounted into the end
plate to secure the station.

Figure 2-9:
End bracket

Note

The end plate an the end bracket are delivered together with each gateway.

D301087 1211 - BL20 CANopen

2-7

BL20 Philosophy

2.2.7 Jumpers

Jumpers (QVRs) are used to bridge a connection level of a 4-wire base module. They can be used to
connect potentials in relay modules (bridging the relay roots); thus considerably reducing the amount
of wiring.

Figure 2-10:
Jumpers

2.2.8 Marking Material

 Labels: for labeling BL20 electronics modules.

 Markers: for colored identification of connection levels of BL20 base modules.

 Dekafix connector markers: for numbering the mounting slots on BL20 base modules.

Figure 2-11:
Marking material

D301087 1211 - BL20 CANopen2-8

BL20 Components

2.2.9 Shield Connection, 2-Pole for Analog Modules

The 2-pole shield connection can be used to connect signal-cable shielding to the base modules of
analog input and output modules. A special tension-clamp operating tool (BL20-ZBW5-2) is required to
mount the shield connection onto the base module.

Figure 2-12:
Shield connection

D301087 1211 - BL20 CANopen

2-9

BL20 Philosophy

D301087 1211 - BL20 CANopen2-10

3 Short description of CANopen

3.1 CANopen .......................................................................................................................................... 2

3.1.1 General .................................................................................................................................................2

3.1.2 Communication ....................................................................................................................................3

– Network Management Messages......................................................................................................3

– Service Data Objects (SDOs).............................................................................................................3

– Process Data Objects (PDOs) ...........................................................................................................4

– Special Function Objects ..................................................................................................................4

3.2 BL20 and CANopen ........................................................................................................................... 5

3.3 Electronic data sheet – EDS file ......................................................................................................... 6

D301087 1211 - BL20 CANopen 3-1

Short description of CANopen

3.1 CANopen

Note

The following description of CANopen is an excerpt from the homepage of CiA (CAN in
Automation), the international users’ and manufacturers’ organization for CAN.

3.1.1 General

CANopen is an open, non-proprietary network protocol. It consists of a profile family, based on a
communication profile and several device profiles. The CANopen communication profile is
standardized as CiA DS-301 (Application Layer and Communication Profile).

The CANopen device profile for I/O-modules has been published as CiA DS-401 (Device Profile for I/O­Modules).

CANopen is based on the following standards:

 ISO 11 898 (Physical and Data Link Layer)

 Layers 1 and 2 of the ISO/OSI communication model

 CiA DS-301 (Application Layer and Communication Profile) C ANopen communication profile

 CiA DS-302 (Framework for Programmable CANopen Devices) CANopen Network Management

NMT

 CiA DS-401 (Device Profile for I/O-modules)

 CiA DS-406 (Device Profile for Encoders) CANopen device profile for counter modules

 CiA DS-102 (CAN Physical Layer for Industrial Applications) General application in the field sector

(connectors and bit rates) on the basis of ISO 11898

D301087 1211 - BL20 CANopen3-2

CANopen

3.1.2 Communication

The lower layers of CANopen are defined according to the ISO-OSI model in the ISO 11898 standard.

Communication between the individual nodes is made by transmitting "Telegrams".

4 different types of telegram message are defined for CANopen:

 Network management messages

 Service data objects SDO

 Process data objects PDO

 Predefined messages

Network Management Messages

Network management messages are used in the network to control the nodes and their operating
states. This type of message makes it possible, for instance, to configure the data transmission
mechanism of a node.

The Network Management objects include Boot-up message, Heartbeat protocol and NMT message.

Boot-up message, Heartbeat and Node Guarding are implemented as single CAN frames with 1-byte
data field.

The NMT message is mapped to a single CAN frame with a data length of 2 byte. Its identifier is 0. The
first byte contains the command specifier and the second contains the Node-ID of the device that must
perform the command (in the case of Node-ID 0 all nodes have to perform the command). The NMT
message transmitted by the NMT master forces the nodes to transit to another NMT state. The
CANopen state machine specifies the states Initialization, Pre-Operational, Operational and Stopped.
After power-on, each CANopen device is in the state Initialization and automatically transits to the state
Pre-operational. In this state, transmission of SDOs is allowed. If the NMT master has set one or more
nodes into the state Operational, they are allowed to transmit and to receive PDOs. In the state Stopped
no communication is allowed except that of NMT objects.

The state Initialization is divided into three sub-states in order to enable a complete or partial reset of a
node. In the sub-state Reset Application the parameters of the manufacturer-specific profile area and
the standardized device profile area are set to their power-on values. In the sub-state Reset
Communication the parameters of the communication profile area are set to their power-on values.
The third sub-state is initializing, which a node enters automatically after power-on. Power-on values
are the last stored parameters.

The Heartbeat protocol is for error control purposes and signals the presence of a node and its state.
The Heartbeat message is a periodic message of the node to one or several other nodes. It indicates that
the sending node is still working properly.

A device sends the Boot-up message to indicate to the NMT master that it has reached the state Pre­operational. This occurs whenever the device initially boots-up but also after a power-out during
operation. The Boot-up message has the same identifier as the Heartbeat object, however, its data
content is zero.

Service Data Objects (SDOs)

A Service Data Object (SDO) reads from entries or writes to entries of the Object Dictionary.

The SDO transport protocol allows transmitting objects of any size. The first byte of the first segment
contains the necessary flow control information including a toggle bit to overcome the problem of
doubly received CAN frames. The next three bytes of the first segment contain index and sub-index of
the Object Dictionary entry to be read or written. The last four bytes of the first segment are available
for user data. The second and the following segments (using the very same CAN identifier) contain the
control byte and up to seven bytes of user data. The receiver confirms each segment or a block of
segments, so that a peer-to-peer communication (client/server) takes place.

D301087 1211 - BL20 CANopen

3-3

Short description of CANopen

Process Data Objects (PDOs)

Process Data Objects (PDOs) are mapped to a single CAN frame using up to 8 bytes of the data field to
transmit application objects. Each PDO has a unique identifier and is transmitted by only one node, but
it can be received by more than one (producer/consumer communication).

PDO transmissions

PDO transmissions may be driven by an internal event, by an internal timer, by remote requests and by
the Sync message received:

 Event- or timer-driven:

An event (specified in the device profile) triggers message transmission. An elapsed timer
additionally triggers the periodically transmitting nodes.

 Remotely requested:

Another device may initiate the transmission of an asynchronous PDO by sending a remote
transmission request (remote frame).

 Synchronous transmission:

In order to initiate simultaneous sampling of input values of all nodes, a periodically transmitted
Sync message is required. Synchronous transmission of PDOs takes place in cyclic and acyclic
transmission mode. Cyclic transmission means that the node waits for the Sync message, after
which it sends its measured values. Acyclically transmitted synchronous PDOs are triggered by a
defined application-specific event.

Special Function Objects

CANopen also defines three specific protocols for synchronization, emergency indication, and time­stamp transmission.

 Synchronization object (Sync)

The Sync Object is broadcast periodically by the Sync Producer. The time period between Sync
messages is defined by the Communication Cycle Period, which may be reset by a configuration
tool to the application devices during the boot-up process. There can be a time jitter in transmission
by the Sync Producer due to some other objects with higher prior identifiers or by one frame being
transmitted just before the Sync message. The Sync message is mapped to a single CAN frame with
the identifier 128 by default. The Sync message does not carry any data.

 Emergency object (Emcy)

The Emergency message is triggered by the occurrence of a device internal error situation and are
transmitted from an Emergency producer on the concerned application device. This makes them
suitable for interrupt type error alerts. An Emergency message is transmitted only once per ‘error
event’. As long as no new errors occurs on a device, no further Emergency message can be
transmitted. Zero or more Emergency consumers may receive these. The reaction of the Emergency
consumer is application-specific. CANopen defines several Emergency Error Codes to be
transmitted in the Emergency message, which is a single CAN frame with 8 data byte.

 Time stamp object (Time)

By means of Time-Stamp, a common time frame reference is provided to application devices. It
contains a value of the type Time-of-Day. This object transmission follows the producer/consumer
push model. The associated CAN frame has the pre-defined identifier 256 and a data field of 6-byte
length.

D301087 1211 - BL20 CANopen3-4

BL20 and CANopen

3.2 BL20 and CANopen

BL20 supports the following CANopen functions:

 SDO transfer, any length of information

 Emergency object

 Sync frame evaluation

 Event-driven PDOs

 Synchronous PDOs (clock-synchronous)

 Remote-requested PDO/polling

D301087 1211 - BL20 CANopen

3-5

Short description of CANopen

3.3 Electronic data sheet – EDS file

CANopen nodes are embedded in the CANopen structure by the help of a standardized EDS file
(Electronic Data Sheet).

The EDS file lists all necessary Objects with their corresponding Sub-indices and the matching entries.

The latest version of a particular EDS file can be downloaded directly from the TURCK Homepage
www.turck.com.

D301087 1211 - BL20 CANopen3-6

4 BL20 - Gateway for CANopen

4.1 Introduction ...................................................................................................................................... 2

4.2 Function ............................................................................................................................................ 3

4.3 Technical Information ....................................................................................................................... 4

4.4 Technical Data................................................................................................................................... 5

4.4.1 General Technical Data ................................... ....................................... ... .... ... ... ... ..............................5

– Relating to a Station .........................................................................................................................5

– Approvals...........................................................................................................................................7

– Base Modules............................... .... ... ....................................... ... ... ... ... ...........................................7

4.4.2 Structure Diagram of a Gateway ............................................................ ... .... ... ... ... ..............................8

4.4.3 Technical Data BL20-GW-CANOPEN ..................................................................................................8

4.4.4 Technical Data BL20-GWBR-CANOPEN .............................................................................................9

4.5 Connections for data cables to BL20-GW-CANOPEN....................................................................... 10

4.5.1 Fieldbus connection via SUB-D socket..............................................................................................10

4.5.2 Fieldbus connection through direct wiring.........................................................................................10

4.6 Connections of the data cables to BL20-GWBR-CANopen............................................................... 12

4.6.1 Fieldbus connection via Open Style connector..................................................................................12

4.6.2 Service Interface Connection ................................. ....................................... ... ... ... .... ... .....................14

– Connection with I/O-ASSISTANT-Connection Cable......................................................................14

4.7 Setting the bit transfer rate through DIP-switches......................................................................... 15

4.8 Node-ID Setting .............................................................................................................................. 17

4.9 Acceptance of the BL20 Station Configuration............................................................................... 19

4.10 Status Indicators/ Diagnostic Messages Gateway .......................................................................... 20

4.10.1 Diagnostic Messag es via LEDs .............................. ... ....................................... ... ... .... ... ... ..................20

D301087 1211 - BL20 CANopen 4-1

BL20 - Gateway for CANopen

4.1 Introduction

This chapter contains a description of BL20 gateways for the standardized fieldbus CANopen. The
chapter is divided up as follows: a description of functions, general and specific technical data, a
description of addressing and status displays.

Attention

Please note, SWIRE-modules can only be used with the gateways BL20-GW-CANOPEN with
firmware version ≥ 4.02 and BL20-GWBR-CANOPEN with firmware version ≥ 2.02.

Danger

The behavior of the analog inputs is now adapted to the actual CANopen standard DS401.
The firmware versions ≥ 4.02 for BL20-GW-CANOPEN and version ≥ 2.02 for BL20-GWBR­CANOPEN are thus not compatible with older firmware versions relating to the behavior of
the analog inputs.

D301087 1211 - BL20 CANopen4-2

Function

4.2 Function

The BL20 gateways enable BL20 modules to operate on CANopen. The gateway is the connection
between the BL20 modules and a CANopen host system. It regulates the process data between the
I/O level and the fieldbus and generates diagnostic data for the higher-level host system.

Information is made available to the software tool I/O-ASSISTANT via the service interface.

D301087 1211 - BL20 CANopen

4-3

BL20 - Gateway for CANopen

ERR BUS

GWBR-

CANOPEN

CAN H

SHLD

CAN L

GND

CAN H

SHLD

CAN L

GND

H

Bit Rate

L

1
2
3
4

A
B

C
D

E

F
G

I

H

J

ERR BUS

GWBR

CANopen

H

Bit Rate

L

1
2
3
4

GND

CAN_L

Shield

CAN_H

A
B

C
D

E

F

G

H

I

4.3 Technical Information

Figure 4-1:
BL20-GW­CANOPEN

A Service interface
B Type designa-

tion

C LEDs for

module bus

D DIP-switch for

transfer rate

E Rotary encod-

ing switch for
Node-ID

F SET button
G CANopen, SUB-

D plug

H CANopen,

direct wiring

I LEDs for

CANopen

J CANopen, SUB-

D socket

Figure 4-2:
BL20-GWBR­CANOPEN

A Service interface
B Type

designation

C LEDs for

module bus

D DIP-switch for

transfer rate

E Rotary encod-

ing switch for
Node-ID

F SET button
G Screw terminals

for field supply
and system sup­ply

H CANopen,

direct wiring

I Open Style con-

nector

D301087 1211 - BL20 CANopen4-4

Technical Data

4.4 Technical Data

4.4.1 General Technical Data

Relating to a Station

Note

The auxiliary power supply must comply with the stipulations of SELV (Safety Extra Low
Voltage) according to IEC 364-4-41.

Table 4-1:
General technical
data (station)

Supply voltage/ auxiliary voltage

Nominal value (provision for other modules) 24 V DC

Permissible range according to EN 61131-2 (18 to 30 V DC)

Residual ripple according to EN 61131-2

Potential isolation Yes, via optocoupler

Ambient conditions

Ambient temperature

–T

–T

0 to +55 °C / 32 to 131 °F

Ambient

-25 to +85 °C / 13 to 185 °F

Store

Relative humidity according to IEC 61 131-2/ EN 50 178

Climatic tests according to IEC 61131-2

Noxious gas – SO

2

:

10 ppm (rel. humidity < 75 %, non-condensing)

S:

–H

2

1.0 ppm (rel. humidity < 75 %, non-condensing)

Resistance to vibration according to IEC 61131-2

10 to 57 Hz, Constant
amplitude 0.075 mm / 0.003 inch, 1g

57 to 150 Hz, Constant acceleration 1 g Yes

Mode of vibration Frequency sweeps with a change in speed of

Period of oscillation 20 frequency sweeps per axis of coordinate

Shock resistant according to IEC 68-2-27 18 shocks, sinusoidal half-wave 15 g peak value/

Resistance to repetitive shock according to
IEC 68-2-29

Topple and fall according to IEC 68-2-31 and free fall according to IEC 68-2-32

Weight < 10 kg

D301087 1211 - BL20 CANopen

Yes

1 Octave/min

11 ms, in each case in +/- direction per space
coordinate

1 000 shocks, half-sinus 25 g peak value/6 ms, in
each case in +/- direction per space coordinate

4-5

BL20 - Gateway for CANopen

Height of fall 1.0 m / 39.37 inch

Weight 10 to 40 kg

Height of fall 0.5 m / 19.69 inch

Test runs 7

Device with packaging, electrically tested printed-circuit board

Electromagnetic compatibility (EMC) according to EN 50 082-2 (Industry)

Static electricity according to EN 61 000-4-2

– Discharge through air (direct) 8 kV

– Relay discharge (indirect) 4 kV

Electromagnetic HF fields according to EN 61
000-4-3 and ENV 50 204

Conducted interferences induced by HF fields
according to EN 61 000-4-6

Fast transients (Burst) according to EN 61 000-4-4

Interference criteria A: unrestricted operation,
normal operating behavior

Interference criteria B: temporary interference,
normal operation possible

Emitted interference according to EN 50 081-2
(Industry)

Reliability

Operational life MTBF min. 120000 h

Electronic modules pull/
plug cycles

Tests according to EN 61 131-2

Cold DIN IEC 68-2-1, temperature -25 °C / -13 °F,

10 V/m

10 V

1 kV

2 kV

according to EN 55 011 Class A, Group 1

20

duration 96 h; not in use

Dry heat DIN IEC 68-2-2, temperature +85 °C / 185 °F,

duration 96 h; device not in use

Damp heat, cyclic DIN IEC 68-2-30, temperature +55 °C / 131 °F,

duration 2 cycles every 12 h; device in use

Temperature change DIN IEC 68-2-14, temperature 0 to +55 °C / 32 to

131 °F, duration 2 cycles, temperature change per
minute; device in use

Pollution severity according to IEC 664 (EN 61 131-2)

Protection class according to IEC 529 IP20

D301087 1211 - BL20 CANopen4-6

Technical Data

Danger

This device can cause radio disturbances in residential areas and in small industrial areas
(residential, business and trading). In this case, the operator can be required to take
appropriate measures to suppress the disturbance at his own cost.

Approvals

Table 4-2:
Approvals

Table 4-3:
Technical data for
base modules

CE

CSA

UL

Base Modules

Protection class IP 20

Measurement data according to VDE 0611 Part 1/8.92/ IEC 947-7-1/1989

Insulation stripping length 8 mm / 0.32 inch

Max. wire range 0.5 to 2.5 mm

2

/ 0.0008 to 0.0039 inch2 / 20 to

12 AWG

Crimpable wire

2

"e” solid core H 07V-U 0.5 to 2.5 mm

/ 0.0008 to 0.0039 inch2 / 20 to

12 AWG

2

"f” flexible core H 07V-K 0.5 to 1.5 mm

/ 0.0008 to 0.0023 inch2 / 20 to

16 AWG

2

"f” with ferrules according to
DIN 46228/1 (ferrules crimped gas-tight)

0.5 to 1.5 mm
16 AWG

/ 0.0008 to 0.0023 inch2 / 20 to

Plug gauge according to

A1

IEC 947-1/1988

TOP connection technology Tension clamp or screw connection

D301087 1211 - BL20 CANopen

4-7

BL20 - Gateway for CANopen

Fieldbus

(External)

Service

interface

External RAM

External

ROM flash

Module bus

(Internal)

Controller

– internal RAM

– WDG

– CAN-Ctr.

4.4.2 Structure Diagram of a Gateway

The BL20 CANopen gateway has the following structure:

Figure 4-3:
Gateway struc­ture

4.4.3 Technical Data BL20-GW-CANOPEN

Table 4-4:
Technical data
BL20-GW­CANOPEN

Designation Value

Supply voltage(as per EN 61131-2)

Nominal value (supply from

5 V DC (4.8 to 5.2 V DC)

bus refreshing module)

Restriction on
EN 61131-2

The supply energy required to bridge a supply
interruption up to 10 ms is not stored. Please
secure the U

for BL20-BR-24VDC-D modules

sys

by using an appropriate power supply unit!

Current drawn from the module bus

Without service/without fieldbus ≈ 280 mA

Without service/with fieldbus (1 Mbps) ≈ 410 mA

With service/without fieldbus ≈ 300 mA

Maximum ≈ 350 mA

Dimensions

Width/length/height (mm) 50.6 x 114.8 x 74.4 mm

Service

Connections PS/2 socket

Fieldbus terminations 1x 9-pole SUB-D socket,

1x 9-pole SUB-D plug, 2 x tension spring
connector type LPZF, 5.08, 5-pole

Fieldbus shielding connection via BL20-SCH-1

Transfer rate 10, 20, 50, 125, 250, 500, 800 and 1000 kbps

Fieldbus termination SUB-D plug connector or external resistors

2 rotary hex encoder switches with labeling for
the Node-ID setting.

D301087 1211 - BL20 CANopen4-8

Technical Data

4.4.4 Technical Data BL20-GWBR-CANOPEN

Table 4-5:
Technical data
BL20-GWBR­CANOPEN

Designation Value

Supply

Field supply

U

Nominal value (range) 24 V DC (18 to 30 V DC)

L

I

max. field current 10 A

L

Isolation voltage (U

to FE)

U

L

to U

L

/ UL to fieldbus/

SYS

500V

eff

Connections 2-pole screw terminal

System supply

U

nominal value (range) 24 V DC (18 to 30 V DC)

SYS

I

(for IMB = 1.2 A/U

SYS

I

(supply to the module bus stations) 1.2 A

MB

Isolation voltage (U

to fieldbus/U

U

SYS

= 18 V DC) max. 900 mA

SYS

500V

SYS

to UL/

SYS

to FE)

eff

Connections 2-pole screw terminal

Physical interfaces

Fieldbus

Transfer rate 10 kbps to 1 Mbps

Isolation voltage (fieldbus to U
fieldbus to U

/fieldbus to FE)

L

SYS

/

500V

eff

Fieldbus connections Socket:

MSTBV 2,5/5-GF-5.08 GY AU/Phoenix Contact

Plug:
TMSTBP 2,5/5-STF-5.08 AB GY AU/Phoenix
Contact (included in delivery)

Fieldbus shielding connection Via connector

Node-ID setting 2 rotary decimal encoding switches

Service

Connections PS/2 socket

Danger

This device can cause radio disturbances in residential areas and in small industrial areas
(residential, business and trading). In this case, the operator can be required to take
appropriate measures to suppress the disturbance at his own cost.

D301087 1211 - BL20 CANopen

4-9

BL20 - Gateway for CANopen

54321

9678

4.5 Connections for data cables to BL20-GW-CANOPEN

4.5.1 Fieldbus connection via SUB-D socket

SUB-D connectors are provided for communication with the BL20-GW-CANOPEN gateway through the
CANopen fieldbus.

The passive bus termination must be applied externally if the BL20 gateway is the last station in the bus
structure. This external application can be implemented either through separate termination resistors
or through a special SUB-D plug which has an integrated bus termination.

The pin assignments for the plug and socket are identical – the socket is shown as an example:

Figure 4-4:
SUB-D socket on
the gateway (top
view)

Table 4-6:
Pin assignments
for gateway SUB­D plug/socket

A The shielding of

the fieldbus is
connected
through the
metal housing
of the SUB-D
connector and
the contact
with the moun­ting rails (see

page 4-11)

Pin No. Designation Meaning

1not used

2 CAN_L inverted data signal (dominant

3 CAN_GND ground (optional for CAN data

4not used

5(CAN_SHLD)

6(GND)

7 CAN_H non-inverted data signal

8not used

9(CAN_V+)

4.5.2 Fieldbus connection through direct wiring

For making connections to the fieldbus you can choose between a SUB-D connection and direct wiring.
Direct wiring of the BL20-GW-CANOPEN to the CANopen fieldbus can be made through the two
terminal blocks with tension spring connectors.

low)

signals)

A

(dominant high)

D301087 1211 - BL20 CANopen4-10

Connections for data cables to BL20-GW-CANOPEN

The passive bus termination must be applied externally if the BL20 gateway is the last station in the bus
structure.

Table 4-7:
List of connecting
leads for direct
wiring

Figure 4-5:
Shielding connec­tion for an BL20­GW-CANOPEN

Designation Meaning

CAN_L Inverted data signal (dominant low)

GND Ground (optional)

SHLD Shielding (see below)

CAN_H Non-inverted data signal (dominant high)

Attention

If the gateway is wired up directly, then the bus connection must be shielded (e.g. with the
help of a BL20-SCH-1 clamp).

Attention

No compensating current should flow through the shielding.

To achieve this, a reliable system of equipotential bonding must be installed.

Note

Equipotential bonding impedance ≤ 1/10 shielding impedance

D301087 1211 - BL20 CANopen

4-11

BL20 - Gateway for CANopen

CAN L

SHIELD

CAN H

GND

4.6 Connections of the data cables to BL20-GWBR-CANopen

4.6.1 Fieldbus connection via Open Style connector

An Open Style Connector (5-pole) is available for connecting the BL20-GWBR-CANOPEN to the
CANopen fieldbus.

The passive bus termination must be applied externally if the BL20 gateway is the last station in the bus
structure.

Table 4-8:
Pin assignment
for the socket

Figure 4-6:
Open Style
connector
(female/top)

Figure 4-7:
Open Style
connector
(female/bottom)

1,2 - red

3,4 - white CAN_H Non-inverted data signal

(dominant high)

5,6 - grey Shield, Shielding braid, not insulated

7,8 - blue CAN_L Inverted data signal

(dominant low)

9,10 - black GND Ground reference (optional)

Figure 4-8:
Open Style
connector (male)

D301087 1211 - BL20 CANopen4-12

Connections of the data cables to BL20-GWBR-CANopen

Figure 4-9:
Shielding connec­tion for an
BL20-GWBR­CANOPEN

Attention

No compensating current should flow through the shielding.

To achieve this, a reliable system of equipotential bonding must be installed.

D301087 1211 - BL20 CANopen

4-13

BL20 - Gateway for CANopen

43

16

25

54321

9678

12345

6987

4.6.2 Service Interface Connection

The following cable can be used to connect the service interface (female PS/2 connector) to a PC for the
purpose of using I/O-ASSISTANT (project planning and diagnostic software).

 special I/O-ASSISTANT-connection cable from TURCK (IOASSISTANT-ADAPTERKABEL-BL20/BL67;

Ident-no.: 6827133)

Connection with I/O-ASSISTANT-Connection Cable

Figure 4-10:
BL20-gateway
connected to PC
via special cable

A SUB-D socket
B BL20 connecting

cable

C PS/2 plug

Figure 4-11:
PS/2 male
connector on the
connection cable
to the gateway
(top view)

Figure 4-12:
9-pole SUB-D
female connector
on the cable for
connecting to PC
(top view)

Table 4-9:
Pin assignments
for PS/2 and SUB­D interfaces

The I/O-ASSISTANT-cables have a PS/2 male connector (connection for female connector on gateway)
and a SUB-D female connector (connection for male connector on PC).

Pin BL20 gateway PS/2

SUB-D interface on PC Pin

socket

1+5 V GwDTR, DSR4, 6

2GNDGND5

3–––

4TxDRxD2

5/CtrlModeRTS7

6RxDTxD3

D301087 1211 - BL20 CANopen4-14

Setting the bit transfer rate through DIP-switches

4.7 Setting the bit transfer rate through DIP-switches

The BL20 gateway can communicate with other CANopen nodes at the following transfer rates:

 10 kbps  250 kbps

 20 kbps  500 kbps

 50 kbps  800 kbps

 125 kbps  1000 kbps

The default transfer rate is 125 kbps.
The transfer rate can be set through the DIP-switches under the cover of the BL20 gateway.

Figure 4-13:
DIP-switch to set
the transfer rate

Note

All the nodes in a CANopen network must be set to the same transfer rate.

To set a bit transfer rate that is supported by CANopen, proceed as follows:

 Switch off the supply voltage for the BL20 gateway.

D301087 1211 - BL20 CANopen

4-15

BL20 - Gateway for CANopen

 Set the DIP-switches for the required transfer rate according to the following table:

Table 4-10:
Setting the
transfer rate

Bit transfer rate (kbps) DIP-switches (setting)

1234

1 000 0000

800 1000

500 0100

250 1100

125 0010

50 1010

20 0110

10 1110

reserved x x x 1

Note

The DIP-switches are in the “1” position when they are set to the right, as viewed from the
front.

 Switch on the supply voltage for the gateway again

D301087 1211 - BL20 CANopen4-16

Node-ID Setting

4.8 Node-ID Setting

A Node-ID is assigned to every BL20 gateway in the CANopen structure.

The setting for the Node-ID of the BL20-GW-CANOPEN in a CANopen structure is made through the two
rotary hex encoding switches. The setting for the Node-ID of the BL20-GWBR-CANOPEN is made
through the two rotary decimal encoding switches. The switches can be found beneath a cover, below
the service interface.

The BL20 gateway can be used as a CANopen node at any point in the bus structure.

Figure 4-14:
Rotary hex
encoding switch
for the CANopen
address setting of
the BL20-GW­CANOPEN

Attention

If the BL20 gateway is used as the the last node in the bus communication, then a special bus
connector with a built-in or add-on termination resistor is absolutely necessary!

Attention

A maximum of 127 Node-IDs (1 to 127) can be assigned in a
CANopen structure. Each Node-ID can only be assigned once in the complete bus structure.

The Node-ID 000 must not be assigned. It is reserved for telegrams that are directed to all the
other bus nodes.

The rotary encoding switches are marked with H for High (more significant digit) and L für Low (less
significant digit).

BL20-GW-CANOPEN:
The L switch is used to set L × 16
The H switch is used to set L × 16

BL20-GWBR-CANOPEN:
The L switch is used to set L × 10
The H switch is used to set L × 10

0

(L = 0 to F).

1

(H = 0 to F).

0

(L = 0 to 9).

1

(H = 0 to 9).

Note

The NODE-ID switch on the BL20-GWBR-CANOPEN can be used to assign Node-IDs from 1 to
99!

D301087 1211 - BL20 CANopen

4-17

BL20 - Gateway for CANopen

Note

After setting the Node-ID, the protective cover over the switches must be closed again.

See chapter 6

Note

BL20 does not support the assignment of Node-IDs across the bus network.

, Maximum System Extension, page 6-2.

D301087 1211 - BL20 CANopen4-18

Acceptance of the BL20 Station Configuration

4.9 Acceptance of the BL20 Station Configuration

When making a new configuration of the BL20 station or an alteration of the existing station structure
(“Module list”), the current configuration must be accepted in the CANopen mirror of the BL20 gateway.
This is done through the configuration button between the two rotary encoding switches.

Note

The green "IOs" LED indicates that the current BL20 configuration matches the stored
reference module list.

Pressing the set button with a pointed object for at least 2 seconds saves the current station
configuration in non-volatile memory. A hardware reset will then be carried out automatically. With this
reset, all the CANopen parameters will be restored to their default values, if the newly saved
configuration is different to the old one.

Attention

When saving the BL20 configuration, all the CANopen objects must be parameterized again,
if their parameter values differ from the default values. The complete parameterization of the
station must subsequently be reloaded into the BL20 station.

The actuation of the button is indicated by a rapid (4 Hz) green blinking of the "IOs" LED. After 2
seconds, the LED changes to yellow blinking at 4 Hz, thus indicating that the station configuration is
being saved. When the storage procedure is completed, the LED changes to a continuous green light.

D301087 1211 - BL20 CANopen

4-19

BL20 - Gateway for CANopen

4.10 Status Indicators/ Diagnostic Messages Gateway

The gateway transmits the following diagnostics: the status of the BL20 station, the communication via
the internal module bus, the communication to CANopen and the status of the gateway.

Diagnostic messages are displayed in two ways:

 via individual LEDs

 via the software of the respective host system or the software-tool I/O-ASSISTANT

4.10.1 Diagnostic Messages via LEDs

Every BL20 gateway displays the following statuses via LEDs:

 2 LEDs for module bus communication (module bus LEDs):

GW and IOs

 2 LEDs for CANopen communication (fieldbus LEDs):

ERR and Bus

The LED diagnoses shown below apply to both gateway versions:

 BL20-GW-CANOPEN

 BL20-GWBR-CANOPEN

An additional diagnosis indication is shown for the BL20-GWBR-CANOPEN.

Table 4-11:
LED indicators

LED Status Meaning Remedy

GW OFF CPU not supplied.

Green 5 V DC operating voltage is present;

firmware is active; gateway is ready
for operation and transfer

GW: green,

Firmware not active Reload the firmware!
flashing,
1Hz
IOs: red

Green,
flashing,

Firmware active, gateway hardware

is defect
4 Hz

Additional diagnosis indication for BL20-GWBR-CANOPEN

-

Replace the gateway.

GW green,

blinking, 1
Hz

: undervoltage or overvoltage

U

SYS

: undervoltage

U

L

Check that the supply voltage is
within the permissible range.

D301087 1211 - BL20 CANopen4-20

Status Indicators/ Diagnostic Messages Gateway

Table 4-11:
LED indicators

LED Status Meaning Remedy

IOs - CPU not supplied. Check the voltage supply.

Green Module bus is running,

­the configured module bus station
corresponds to the physically
connected station, communication
is active.

Green,
flashing,

Station is in the
I/O-ASSISTANT Force Mode.

Deactivate the
I/O-ASSISTANT Force Mode.

1 Hz

Red and
LED "GW"
off

Controller is not ready, V
not within the required range →
possible reasons:

– too many modules connected to

level is

CC

– Check wiring at the gateway and

the voltage supply.
– Dismount modules
– Replace the gateway.

the gateway
–short circuit in connected module
– hardware error in
–gateway

Red
flashing,
1 Hz

Non-adaptable modification of the
physically connected station.

– Compare the planned BL20 station

with the physical station.

– Check the physical station for

defective or incorrectly fitted
electronics modules.

Red
flashing,
4Hz

Red/green
flashing,
1Hz

Red Short circuit or overload at sensor

no module bus communication At least one module has to be

plugged and has to be able to
communicate with the gateway.

Adaptable modification of the
physically connected station;
data transfer possible

Check the physical station for
pulled or new but not planned
modules.

Automatic restart when

supply → sensor supply is switched

debugging.

off

Off No voltage supply. Check the wiring of the voltage

supply.

D301087 1211 - BL20 CANopen

4-21

BL20 - Gateway for CANopen

Table 4-11:
LED indicators

LED Status Meaning Remedy

ERR Off No errors in communication

–
between the BL20-CANopen
gateway and other CANopen nodes

Red Faulty or interrupted

communication between BL20­CANopen gateway and other
CANopen.
Possible causes:

–CAN-BusOff
– Heartbeat error
– Guarding error
– Transmit timeout

– Check that the fieldbus ends with a

termination resistor, if the BL20­CANopen gateway is the last node
in the bus topology.

– Check the seating of the CANopen

bus connector (or the joints in the
case of direct wiring). All
connections must be correct and
properly seated.

– Check the CANopen cable for

possible damage, and for correct
connections.

– Check that the correct bit rate has

been set.

– Check that the NMT-master is still

functioning properly.

Bus OFF Fieldbus not operating Wait until the firmware download is

finished.

If the download is finished:

hardware error; replace the

gateway.

red NMT-slave state of the BL20-

orange NMT-slave state of the BL20-

green NMT-slave state of the BL20-

ERR + BUS red,

blinking
alternately,
4Hz

–
CANopen gateway is "Stopped"

–
CANopen gateway is "Pre­Operational"

–
CANopen gateway is "Operational"

Invalid Node-ID has been set Set the correct Node-ID with the

rotary hexadecimal

or decimal

encoding switches.

D301087 1211 - BL20 CANopen4-22

5 BL20 - Communication in CANopen

Note

The CANopen-description for BL20 can be found in a separate manual „BL×× CANopen­object register “ D301230 unter www.turck.de.

D301087 1211 - BL20 CANopen 5-1

BL20 - Communication in CANopen

D301087 1211 - BL20 CANopen5-2

6 Guidelines for Station Planning

6.1 Random Module Arrangement ......................................................................................................... 2

6.1.1 Complete Planning ................................................................. ... ...........................................................2

6.1.2 Maximum System Extension ................................................................................................................2

6.2 Power Supply .................................................................................................................................... 4

6.2.1 Gateway Supply ...................................................................................................................................4

6.2.2 Module Bus Refreshing ........................................................................................................................4

6.2.3 Creating Potential Groups ....................................................................................................................8

6.2.4 Protecting the Service Interface on the Gat ew ay.......................... ... ... ....................................... ... . ......8

6.2.5 C-Rail (Cross Connection)....................................................................................................................9

6.2.6 Direct Wiring of Relay Modules ..........................................................................................................10

6.3 Plugging and Pulling Electronics Modules...................................................................................... 11

6.4 Extending an Existing Station......................................................................................................... 12

6.5 Firmware Download........................................................................................................................ 13

D301087 1211 - BL20 CANopen 6-1

Guidelines for Station Planning

6.1 Random Module Arrangement

The arrangement of the I/O-modules within a BL20 station can basically be chosen at will.

Nevertheless, it can be useful with some applications to group certain modules together.

Note

The mixed usage of base modules with screw connections and base modules with tension
clamp connections requires a further power supply module to be mounted. Thereby, it must
be ensured that the base modules are fitted with the same connection technology (screw or
tension clamp) as the power supply module.

6.1.1 Complete Planning

The planning of a BL20 station should be thorough to avoid faults and increase operating reliability.

Attention

If there are more than two empty slots next to one another, the communication is interrupted
to all following BL20 modules.

6.1.2 Maximum System Extension

A BL20 station can consist of a gateway and a maximum of 74 modules in slice design (equivalent to
1 m in length of mounting rail including the end bracket and end plate). The maximum number of
modules is less when using block modules (1 block module is equivalent to 8 modules in slice design).

D301087 1211 - BL20 CANopen6-2

Random Module Arrangement

The following overview shows the maximum number of channels possible, on condition that the entire
station is made up of that respective type of channel only:

Table 6-1:
Maximum system
extension

A plus 1 Bus Ref-

reshing module
B plus 2
Bus Refreshing
modules
C plus 3
Bus Refreshing
modules

Channels Modules

Type Max. no. Type Max. no.

72 B

B

Digital inputs 288 BL20-4DI-24VDC-P 72

Digital outputs 288 BL20-4DO-24VDC-

0.5A-P

Analog inputs, current 126 BL20-2AI-I(0/4...20MA) 63 C

Analog inputs, voltage 126 BL20-2AI-U(-10/

63

C

0...+10VDC)

Analog inputs, voltage/

112 BL20-4AI-U/I 28

A

current

Analog inputs, PT /Ni 126 BL20-2AI-PT/NI-2/3 63

Analog inputs,

126 BL20-2AI-THERMO-PI 63

C

C

Thermocouple

Analog outputs,

126 BL20-2AO-I(0/4...20MA) 63

C

current

Analog inputs, voltage 126 BL20-2AO-U(-10/

63

C

0...+10VDC)

Counter 31 BL20-1CNT-24VDC 31 A

RS232 31 BL20-1RS232 31 A

RS485/422 31 BL20-1RS485/422 31 A

SSI 31 BL20-1SSI 31 A

SWIRE 16 BL20-E-1SWIRE 16 A

Further limitations can be placed on the maximum possible number of BL20 modules by the use of the
Power Feeding modules BL20-PF-24VDC-D or BL20-PF-120/230VAC-D; these being used either for
creating potential groups or by insufficient field supply.

Attention

Ensure that a sufficient number of Power Feeding or Bus Refreshing modules are used if the
system is extended to its maximum.

Note

If the system limits are exceeded, the software I/O-ASSISTANT gen-erates an error message
when the user activates the "Station → Verify" command.

D301087 1211 - BL20 CANopen

6-3

Guidelines for Station Planning

6.2 Power Supply

6.2.1 Gateway Supply

Note

On a BL20 station including a gateway without integrated power supply unit, the first module
to be mounted after the gateway is a Bus Refreshing module with either a BL20-P3x-SBB or a
BL20-P4x-SBBC base module with tension clamp or screw connection.

6.2.2 Module Bus Refreshing

The number of BL20 modules that can be supplied by the gateway or a separate Bus Refreshing module
via the internal module bus depends on the respective nominal current consumption of the individual
modules on the module bus.

Attention

The sum total of the nominal current consumption of the connected BL20 modules must not
exceed 1.5 A.

The following examples show the calculation for the required number of Bus Refreshing modules:

Example 1:

The BL20 station consists of 20 BL20-1AI-I(0/4...20MA) modules. The number of additional Bus
Refreshing modules required is calculated as follows:

Gateway 430 mA

20 BL20-1AI-I(0/4...20MA) 20 x 41 mA 820 mA

Total: 1250 mA

Maximum permissible current via module bus: 1 500 mA

The calculation shows that no further Bus Refreshing module is required.

D301087 1211 - BL20 CANopen6-4

Power Supply

Example 2:

The BL20 station comprises 15 BL20-1AI-U(-10/0...+10VDC) modules, 10 BL20-2AO-U(-10/0...+10VDC)
modules, 10 BL20-2DI-24VDC-P modules and 5 BL20-2DO-24VDC-0.5A-P modules. The required
number of Bus Refreshing modules is calculated as follows:

Gateway 430 mA

15 BL20-1AI-U(-10/0...+10VDC) 15 x 41 mA 615 mA

10 BL20-2AO-U(-10/0...+10VDC) 10 x 43 mA 430 mA

10 BL20-2DI-24VDC-P 10 x 28 mA 280 mA

5 BL20-2DO-24VDC-0.5A-P 5 x 32 mA 160 mA

Total: 1 915 mA

Table 6-2:
Nominal current
consumption of
the BL20 modules
on the module bus

Maximum permissible current via module bus: 1 500 mA

The calculation shows that an additional/further Bus Refreshing module is required at the latest
following the last BL20-2AO module. This Bus Refreshing module is sufficient to supply the remaining
modules.

Note

The power requirements of the BL20 gateway is to be considered when calculating the
required number of Bus Refreshing modules.

The following table offers an overview of the nominal current consumption of the individual BL20
modules on the module bus:

Module Supply Nominal current consumption

Gateway 1 500 mA ≤ 430 mA

BL20-PF-24VDC-D 28 mA

BL20-PF-120/230VAC-D 25 mA

BL20-2DI-24VDC-P 28 mA

BL20-2DI-24VDC-N 28 mA

BL20-2DI-120/230VAC 28 mA

BL20-4DI-24VDC-P 29 mA

BL20-4DI-24VDC-N 28 mA

BL20-E-8DI-24VDC-P 15 mA

BL20-16DI-24VDC-P 45 mA

D301087 1211 - BL20 CANopen

6-5

Guidelines for Station Planning

Table 6-2:
Nominal current
consumption of
the BL20 modules
on the module bus

Module Supply Nominal current consumption

BL20-E-16DI-24VDC-P 15 mA

BL20-32DI-24VDC-P 30 mA

BL20-1AI-I(0/4...20MA) 41 mA

BL20-2AI-I(0/4...20MA) 35 mA

BL20-1AI-U(-10/0...+10VDC) 41 mA

BL20-2AI-U(-10/0...+10VDC) 35 mA

BL20-2AI-PT/NI-2/3 45 mA

BL20-2AI-THERMO-PI 45 mA

BL20-4AI-U/I 50 mA

BL20-2DO-24VDC-0.5A-P 32 mA

BL20-2DO-24VDC-0.5A-N 32 mA

BL20-2DO-24VDC-2A-P 33 mA

BL20-4DO-24VDC-0.5A-P 30 mA

BL20-E-8DO-24VDC-P 15 mA

BL20-16DO-24VDC-0.5A-P 120 mA

BL20-E-16DO-24VDC-P 25 mA

BL20-32DO-24VDC-0.5A-P 30 mA

BL20-1AO-I(0/4...20MA) 39 mA

BL20-2AO-I(0/4...20MA) 40 mA

BL20-2AO-U(-10/0...+10VDC) 43 mA

BL20-2DO-R-NC 28 mA

BL20-2DO-R-NO 28 mA

BL20-2DO-R-CO 28 mA

BL20-1CNT-24VDC 40 mA

BL20-1RS232 140 mA

BL20-1RS485/422 60 mA

BL20-1SSI 50 mA

BL20-2RFID 30 mA

BL20-E-1SWIRE 60 mA

D301087 1211 - BL20 CANopen6-6

Power Supply

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–+

Field supply

TS

2 DO 2 DI 2 DO 2 DI BR

SBBC-B

2 DIAI1AO NO

24

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13

12

11

24

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14

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12

11

2 DI

Gateway

GND-

CAN_L

Shield

CAN_H

+–

+–

Field supply

System supply

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11

23 23

22 22

21 21

13 13

12 12

11 11

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11

+–

+

–+

–

=

Field supply

System supply

Field supply

GatewayTSBR

SBBC

2 DO 2 DI 2 DO 2 DI BR

SBBC-B

2 DIAI1AO NO

CANH

SHLD

CANL

GND

CANH

SHLD

CANL

GND

Figure 6-1:
Power supply at
BL20-GWBR­CANOPEN

If the power supply from the module bus is not guaranteed, thereby making a further Bus Refreshing
module necessary, the software I/O-ASSISTANT generates an error message when the user activates
the command “Station → Verify“.

Note

Bus Refreshing modules which do not supply the gateway with power are to be combined
with either a BL20-P3T-SBB-B or a BL20-P4T-SBBC-B (tension clamp connection) base module
or with the base modules BL20-P3S-SBB-B or BL20-P4S-SBBC-B (screw connection).

Figure 6-2:
Power supply at
BL20-GW­CANOPEN

With the system supply, it must be ensured that the same ground potential and ground connections
are used. Compensating currents flow via the module bus if different ground potentials or ground
connections are used, which can lead to the destruction of the Bus Refreshing module.

All Bus Refreshing modules are connected to one another via the same ground potential.

The power to the module bus is supplied via the connections 11 and 21 on the base module.

D301087 1211 - BL20 CANopen

6-7

Guidelines for Station Planning

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11

23 23

22 22

21 21

13 13

12 12

11

24

23 23

22 22

21 21

14

13 13

12 12

11 11

Potential group 2

2L+ 2L-

2 DO 2 DI PF 2 DO2 DI

24

23

22

21

14

13

12

11

Potential group 1

TS

2 DIAI NO

24

23

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21

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12

11

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21

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11

24

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24

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21

14

13

12

11

NO

AI

24

23

22

21

14

13

12

11

Gateway

GND

CAN_L

Shield

CAN_H

+–

+ –

System supply

Field supply

6.2.3 Creating Potential Groups

Bus Refreshing and Power Feeding modules can be used to create potential groups. The potential
isolation of potential groups to the left of the respective power distribution modules is provided by the
base modules.

Attention

Ensure that the correct base modules are planned for when using Bus Refreshing modules.

Figure 6-3:
Example for
creating potential
groups with
BL20-GWBR­CANOPEN

Note

The system can be supplied with power independent of the potential group formation
described above.

When using a digital input module for 120/230 V AC, it should be ensured that a potential group is
created in conjunction with the Power Feeding module BL20-PF-120/230VAC-D.

Attention

It is not permitted to use the modules with 24 V DC and 120/230 V AC field supply in a joint
potential group.

6.2.4 Protecting the Service Interface on the Gateway

During operation, the cover protecting the service interface and the rotary coding-switches must
remain closed due to EMC and ESD.

D301087 1211 - BL20 CANopen6-8

Power Supply

6.2.5 C-Rail (Cross Connection)

The C-rail runs through all base modules. The C-rail of the base modules for power distribution modules
is mechanically separated; thus potentially isolating the adjoining supply groups.

Access to the C-rail is possible with the help of base modules with a C in their designation (for example,
BL20-S4T-SBCS). The corresponding connection level is indicated on these modules by a thick black
line. The black line is continuous on all I/O modules. On power distribution modules, the black line is
only above the connection 24. This makes clear that the C-rail is separated from the adjoining potential
group to its left.

Figure 6-4:
C-rail front view

Figure 6-5:
C-rail side view

Danger

It is permitted to load the C-rail with a maximum of 24 V. Not 230 V!

The C-rail can be used as required by the application, for example, as a protective earth (PE). In this case,
the PE connection of each power distribution module must be connected to the mounting rail via an
additional PE terminal, which is available as an accessory.

Note

For information about introducing a BL20 station into a ground reference system, please read
chapter 7.

D301087 1211 - BL20 CANopen

6-9

Guidelines for Station Planning

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11

23 23

22 22

21 21

13 13

12 12

11 11

23 2323

22 2222

21 2121

13 1313

12 1212

11 1111

24 24

23 23

22 22

21 21

14 14

13 13

12 12

11 11

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11

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21

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12

11

Gateway

TS

BR

SBBC

2 DO

SBC

2 DI

SBBC

2 DO

SBC

2 DI

SBBPFSBBC

2 DI2 DO

SBBCSBC

2 DO

SBC

2 DI

SBB

C-rail (PE) C-rail (PE)

PE

terminal

Gateway

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12

11

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22 22

21 21

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12

11

yyy

TS

Gateway

PE

terminal

BR

SBBC

2 DO

SBC

2 DI

SBBC

2 DO

SBC

2 DI

SBB

PF NCNO

SBCSSBCS

NO

SBCSNCSBCS

C-rail (24 V DC)C-rail (PE)

SBBC

Figure 6-6:
Using the C-rail as
a protective earth

C-rails can be used for a common voltage supply when relay modules are planned. To accomplish this,
the load voltage is connected to a Power Feeding module with the BL20-P4x-SBBC base module with
tension clamp or screw connection. All the following relay modules are then supplied with power via
the C-rail.

Figure 6-7:
Using the C-rail as
protective earth
and for the power
supply with relay
modules

Attention

When relay modules are planned and the C-rail is used for a common voltage supply, a further
power distribution module must be used for the potential isolation to the following modules.
The C-rail can only again be used as a PE following potential isolation.

Cross-connecting relay module roots is achieved by the use of jumpers. The corresponding wiring
diagram including the jumpers can be found in chapter 4.

6.2.6 Direct Wiring of Relay Modules

As well as the options mentioned above, relay modules can be wired directly. In this case, base modules
without C-rail connections should be chosen to guarantee the potential isolation to the adjoining
modules.

D301087 1211 - BL20 CANopen6-10

Plugging and Pulling Electronics Modules

6.3 Plugging and Pulling Electronics Modules

BL20 enables the pulling and plugging of electronics modules without having to disconnect the field
wiring. The BL20 station remains in operation if an electronics module is pulled. The voltage and current
supplies as well as the protective earth connections are not interrupted.

Attention

If the field and system supplies remain connected when electronics modules are plugged or
pulled, short interruptions to the module bus communications can occur in the BL20 station.
This can lead to undefined statuses of individual inputs and outputs of different modules.

D301087 1211 - BL20 CANopen

6-11

Guidelines for Station Planning

6.4 Extending an Existing Station

Attention

Please note that extensions to the station (mounting further modules) should be carried out
only when the station is off-circuit.

Once alterations have been made to the order of the modules on the BL20 station, the new
configuration must be saved to the ”actual configuration memory” of the BL20 gateway. This is done
by either pressing the SET button between the two decimal rotary coding switches (see chapter 2) or
by making the appropriate settings in the configuration software (see chapter 3).

D301087 1211 - BL20 CANopen6-12

Firmware Download

6.5 Firmware Download

Firmware can be downloaded via the service interface on the gateway using the software tool
I/O-ASSISTANT. More information is available in the program’s online help.

Attention

The station should be disconnected from the fieldbus when downloading.

Firmware must be downloaded by authorized personnel only.

The field level must be isolated.

D301087 1211 - BL20 CANopen

6-13

Guidelines for Station Planning

D301087 1211 - BL20 CANopen6-14

7 Guidelines for Electrical Installation

7.1 General Notes.................................................................................................................................... 2

7.1.1 General .................................................................................................................................................2

7.1.2 Cable Routing........ .... ... ....................................... ... ... ... .... ...................................... ..............................2

7.1.3 Cable Routing Inside and Outside of Cabinets: ........................................ .... ... ....................................2

– Cable Routing Outside Buildings ......................................................................................................2

7.1.4 Lightning Protection .............................................................................................................................3

7.1.5 Transmission Cables ............................................................................................................................3

7.1.6 Cable Types.................................. ... .... ...................................... .... ... ... ... ..............................................3

7.2 Potential Relationships..................................................................................................................... 4

7.2.1 General .................................................................................................................................................4

7.2.2 Potential-Free Installation.....................................................................................................................4

7.2.3 Non-isolated Installation.......................................................................................................................4

7.3 Electromagnetic Compatibility (EMC)............................................................................................... 5

7.3.1 Ensuring Electromagnetic Compatibility ..............................................................................................5

7.3.2 Grounding of Inactive Metal Components ...........................................................................................5

7.3.3 PE Connection......................................................................................................................................5

7.3.4 Earth-Free Operation............................................................................................................................5

– Protect against high frequency interference signals .........................................................................6

7.3.5 Mounting Rails......................................................................................................................................6

7.3.6 EMC Compliant Cabinet Installation ....................................................................................................7

7.4 Shielding of cables ............................................................................................................................ 8

7.5 Potential Compensation ................................................................................................................... 9

7.5.1 Switching Inductive Loads ..................... ... ....................................... ... ... ... .... ... ..................................10

7.5.2 Protection against Electrostatic Disc ha rg e (ESD ) ........ .... ... ... ....................................... ... ... ... .... ........10

7.6 Bus Connection ............................................................................................................................... 11

7.7 Two-Pole Shield Connection ........................................................................................................... 12

7.8

D301087 1211 - BL20 CANopen 7-1

Guidelines for Electrical Installation

7.1 General Notes

7.1.1 General

Cables should be grouped together, for example: signal cables, data cables, heavy current cables,
power supply cables.

Heavy current cables and signal or data cables should always be routed in separate cable ducts or
bundles. Signal and data cables must always be routed as close as possible to ground potential surfaces
(for example support bars, cabinet sides etc.).

7.1.2 Cable Routing

Correct cable routing prevents or suppresses the reciprocal influencing of parallel routed cables.

7.1.3 Cable Routing Inside and Outside of Cabinets:

To ensure EMC-compatible cable routing, the cables should be grouped as follows:

Various types of cables within the groups can be routed together in bundles or in cable ducts.

Group 1:

 shielded bus and data cables

 shielded analog cables

 unshielded cables for DC voltage ≤ 60 V

 unshielded cables for AC voltage ≤ 25 V

Group 2:

 unshielded cables for DC voltage > 60 V and ≤ 400 V

 unshielded cables for AC voltage > 25 V and ≤ 400 V

Group 3:

 unshielded cables for DC and AC voltages > 400 V

The following group combination can be routed only in separate bundles or separate cable ducts (no
minimum distance apart):

Group 1/Group 2

The group combinations:

Group 1/Group 3 and Group 2/Group 3

must be routed in s eparate cable ducts with a mi nimum dista nce of 10 cm apart. Th is is equ ally val id for
inside buildings as well as for inside and outside of switchgear cabinets.

Cable Routing Outside Buildings

Outside of buildings, cables should be routed in closed (where possible), cage-type cable ducts made
of metal. The cable duct joints must be electrically connected and the cable ducts must be earthed.

Danger

Observe all valid guidelines concerning internal and external lightning protection and
grounding specifications when routing cables outside of buildings.

D301087 1211 - BL20 CANopen7-2

General Notes

Station 0

Station 63Station x

terminating
resistor

terminating
resistor

R

t

R

t

7.1.4 Lightning Protection

The cables must be routed in double-grounded metal piping or in reinforced concrete cable ducts.

Signal cables must be protected against overvoltage by varistors or inert-gas filled overvoltage
arrestors. Varistors and overvoltage arrestors must be installed at the point where the cables enter the
building.

7.1.5 Transmission Cables

The slaves on the bus are connected to one another with fieldbus lines that correspond to the
DeviceNet specification (ODVA Spec. Rel. V2.0).

The bus cables must be terminated at the beginning and end with a bus terminating resistor. This can
be connected via the number 4 DIP switch on the gateway.

Figure 7-1:
Representation of
a bus cable

7.1.6 Cable Types

TURCK offers a variety of premoulded bus cables - please refer to the BL20-catalog (TURCK
documentation number: D300418).

D301087 1211 - BL20 CANopen

7-3

Guidelines for Electrical Installation

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Gateway

Power Feeding

Bus Refreshing

I/O moduleI/O module I/O module

Bus Refreshing

Logic Logic

5V

Logic

24 V

2 O 2 O 4 I

24 V24 VField-

bus

24 V230 V

Logic

DC DC

DC DC

+V -V

7.2 Potential Relationships

7.2.1 General

The potential relationship of a CANopen system realized with BL20 modules is characterized by the
following:

 The system’s power supply to the gateway, I/O modules and the field level is distributed via a Bus

Refreshing module.

 All BL20 modules (gateway, Bus Refreshing, Power Feeding and I/O modules), are connected

capacitively via base modules to the mounting rails.

 Separate power supplies for the system and the field level allow a potential-free installation.

The block diagram shows the arrangement of a typical BL20 station.

Figure 7-2:
Block diagram of
a BL20 station

7.2.2 Potential-Free Installation

In a potential-free installation, the reference potentials of control and load circuitry are galvanically
isolated from each other.

A potential-free installation is necessary with

 All AC load circuits (for example, when using the Power Feeding module BL20-PF-120/230VAC-D)

 Floating DC load circuits

The potential-free installation does not depend on the method of grounding.

7.2.3 Non-isolated Installation

In a non-isolated installation, the reference potentials of the control and load circuitry are galvanically
connected.

D301087 1211 - BL20 CANopen7-4

Electromagnetic Compatibility (EMC)

7.3 Electromagnetic Compatibility (EMC)

BL20 products comply in full with the requirements pertaining to EMC regulations.

Nevertheless, an EMC plan should be made before installation. Hereby, all potential electromechanical
sources of interference should be considered such as galvanic, inductive and capacitive couplings as
well as radiation couplings.

7.3.1 Ensuring Electromagnetic Compatibility

The EMC of BL20 modules is guaranteed when the following basic rules are adhered to:

 Correct and large surface grounding of inactive metal components.

 Correct shielding of cables and devices.

 Proper cable routing – correct wiring.

 Creation of a standard reference potential and grounding of all electrically operated devices.

 Special EMC measures for special applications.

7.3.2 Grounding of Inactive Metal Components

All inactive metal components (for example: switchgear cabinets, switchgear cabinet doors, supporting
bars, mounting plates, tophat rails, etc.) must be connected to one another over a large surface area
and with a low impedance (grounding). This guarantees a standardized reference potential area for all
control elements and reduces the influence of coupled disturbances.

 In the areas of screw connections, the painted, anodized or isolated metal components must be

freed of the isolating layer. Protect the points of contact against rust.

 Connect all free moving groundable components (cabinet doors, separate mounting plates, etc.) by

using short bonding straps to large surface areas.

 Avoid the use of aluminum components, as its quick oxidizing properties make it unsuitable for

grounding.

Danger

The grounding must never – including cases of error – take on a dangerous touch potential.
For this reason, always protect the ground potential with a protective cable.

7.3.3 PE Connection

A central connection must be established between ground and PE connection (protective earth).

7.3.4 Earth-Free Operation

Observe all relevant safety regulations when operating an earthfree system.

D301087 1211 - BL20 CANopen

7-5

Guidelines for Electrical Installation

Protect against high frequency interference signals

Attention

In order to comply with radiation limit values in accordance with EN 55 011/2 000, the supply
lines of the power distribution module BL20-BR-24VDC-D for supplying the gateway with
power are to be fed through a ferrite ring (BL20PS416-ZBX-405). This is to be placed
immediately next to the connection terminals. From there on, it is not permitted to make
connections to further devices.

7.3.5 Mounting Rails

All mounting rails must be mounted onto the mounting plate with a low impedance, over a large
surface area, and must be correctly earthed.

Figure 7-3:
Mounting options

A TS 35
B Mounting rail
C Mounting plate
D TS 35

Mount the mounting rails over a large surface area and with a low impedance to the support system
using screws or rivets.

Remove the isolating layer from all painted, anodized or isolated metal components at the connection
point. Protect the connection point against corrosion (for example with grease; caution: use only
suitable grease).

D301087 1211 - BL20 CANopen7-6

Electromagnetic Compatibility (EMC)

abc d e

A

BC D

E

7.3.6 EMC Compliant Cabinet Installation

Figure 7-4:
EMC compliant
cabinet installa­tion

A Bonding straps

Bonding straps connect inactive metal components, if it is not possible to create a large surface area contact. Use
short bonding straps with large surface areas.

B Mounting plates

Mounting plates used to hold control components must have a large surface area contact with the cabinet housing.

C Protective conductor rail

The protective conductor rail must also be connected over a large surface area to the mounting plates and
additionally with an external cable (cross-section at least 10 mm2 / 0,015 inch2) to the protective conductor system to
avoid interference currents.

D Protective conductor terminal block

The protective conductor terminal block must be connected to the protective conductor rail.

E Protective conductor system cable (grounding point)

The cable must be connected over a large surface area with the protective conductor system.

D301087 1211 - BL20 CANopen

7-7

Guidelines for Electrical Installation

7.4 Shielding of cables

Shielding is used to prevent interference from voltages and the radiation of interference fields by
cables. Therefore, use only shielded cables with shielding braids made from good conducting materials
(copper or aluminum) with a minimum degree of coverage of 80 %.

The cable shield should always be connected to both sides of the respective reference potential (if no
exception is made, for example, such as high-resistant, symmetrical, analog signal cables). Only then
can the cable shield attain the best results possible against electrical and magnetic fields.

A one-sided shield connection merely achieves an isolation against electrical fields.

Attention

When installing, please pay attention to the following...

– the shield should be connected immediately when entering the
–system,
– the shield connection to the shield rail should be of low
–impedance,
– the stripped cable-ends are to be kept as short as possible,
– the cable shield is not to be used as a bonding conductor.

The insulation of the shielded data-cable should be stripped and connected to the shield rail when the
system is not in operation. The connection and securing of the shield should be made using metal
shield clamps. The shield clamps must enclose the shielding braid and in so doing create a large surface
contact area. The shield rail must have a low impedance (for example, fixing points of 10 to 20 cm apart)
and be connected to a reference potential area.

The cable shield should not be severed, but routed further within the system (for example, to the
switchgear cabinet), right up to the interface connection.

Note

Should it not be possible to ground the shield on both sides due to switching arrangements
or device specific reasons, then it is possible to route the second cable shield side to the local
reference potential via a capacitor (short connection distances). If necessary, a varistor or
resistor can be connected parallel to the capacitor, to prevent disruptive discharges when
interference pulses occur.

A further possibility is a double-shielded cable (galvanically separated), whereby the
innermost shield is connected on one side and the outermost shield is connected on both
sides.

D301087 1211 - BL20 CANopen7-8

Potential Compensation

Reference potential

Potential compensation cable

Shield

Reference potential

7.5 Potential Compensation

Potential differences can occur between installation components that are in separate areas and these

 are fed by different supplies,

 have double-sided conductor shields which are grounded on different installation components.

A potential-compensation cable must be routed to the potential compensation.

Danger

Never use the shield as a potential compensation.

Connection 1 Connection 2

CAN_H 0 --------- 0 CAN_H

CAN_L 0 --------- 0 CAN_L

GND 0 --------- 0 GND

Figure 7-5:
Potential
compensation

A potential compensation cable must have the following characteristics:

 Low impedance. In the case of compensation cables that are routed on both sides, the

compensation line impedance must be considerably smaller than that of the shield connection
(max. 10 % of shield connection impedance).

 Should the length of the compensation cable be less than 200 m, then its cross-section must be at

least 16 mm
25 mm

2

/ 0.025 inch2. If the cable length is greater than 200 m, then a cross-section of at least

2

/ 0.039 inch2 is required.

 The compensation cable must be made of copper or zinc coated steel.

 The compensation cable must be connected to the protective conductor over a large surface area

and must be protected against corrosion.

D301087 1211 - BL20 CANopen

7-9

Guidelines for Electrical Installation

Potential compensation

 Compensation cables and data cables should be routed as close together as possible, meaning the

enclosed area should be kept as small as possible.

Figure 7-6:
Potential
compensation
between switch­gear cabinets

7.5.1 Switching Inductive Loads

In the case of inductive loads, a protective circuit on the load is recommended.

7.5.2 Protection against Electrostatic Discharge (ESD)

Attention

Electronic modules and base modules are at risk from electrostatic discharge when
disassembled. Avoid touching the bus connections with bare fingers as this can lead to ESD
damage.

D301087 1211 - BL20 CANopen7-10

Bus Connection

7.6 Bus Connection

An Open Style Connector (5-pole) is available for connecting the BL20-GWBR-CANopen to the
CANopen fieldbus.

The shield connection is made via the shielding braid of the cable.

For detailed information about the bus connection of the gateway please refer to chapter 4.6,

Connections of the data cables to BL20-GWBR-CANopen (page 4-12).

D301087 1211 - BL20 CANopen

7-11

Guidelines for Electrical Installation

7.7 Two-Pole Shield Connection

The 2-pole shield connection can be used to connect signal-cable shielding to the base modules of
analog input and output modules. A special tension-clamp operating tool (BL20-ZBW5-2) is required to
mount the shield connection onto the base module.

Figure 7-7:
Two-pole shield
connection for
analog modules

The following cable diameters are permissible for the shield connection:

Diameter of the shielding braid:max. 4.9 mm / 0.19 inch

Outer diameter of the cable: max. 6.5 mm / 0.26 inch

D301087 1211 - BL20 CANopen7-12

8 BL20-Approvals for Zone 2/ Division 2

Note

The Zone 2 - approval certificates for BL20 can be found in a separate manual for approvals

D301255 on www.turck.de.

D301087 1211 - BL20 CANopen 8-1

BL20-Approvals for Zone 2/ Division 2

D301087 1211 - BL20 CANopen8-2

D301087 1211 - BL20 CANopen

8-3

BL20-Approvals for Zone 2/ Division 2

D301087 1211 - BL20 CANopen8-4

D301087 1211 - BL20 CANopen

8-5

BL20-Approvals for Zone 2/ Division 2

D301087 1211 - BL20 CANopen8-6

9Glossary

A

B

Acknowledge

Acknowledgment of a signal received.

Active metal component

Conductor or conducting component that is electrically live during operation.

Address

Identifier of, e.g. a memory position, a system or a module within a network.

Addressing

Allocation or setting of an address, e. g. for a module in a network.

Analog

Infinitely variable value, e. g. voltage. The value of an analog signal can take on any value, within certain limits.

Attribute

Attributes represent the data that a device makes available via the DeviceNet fieldbus (e. g. status of an object,
serial number of the device, process data).

Automation device

A device connected to a technical process with inputs and outputs for control. Programmable logic controllers
(PLC) are a special group of automation devices.

Baud

Baud is a measure for the transmission speed of data. 1 Baud corresponds to the transmission of one bit per
second (Bit/s).

Baud rate

Unit of measurement for data transmission speeds in Bit/s.

Bidirectional

Working in both directions.

Bit Strobe

A Bit Strobe I/O connection is a connection between a DeviceNet client and an undetermined number of servers,
these being queried by commands sent by the client.

Bonding strap

Flexible conductor, normally braided, that joins inactive components, e. g. the door of a switchgear cabinet to the
cabinet main body.

Bus

Bus system for data exchange, e. g. between CPU, memory and I/O levels. A bus can consist of several parallel

cables for data transmission, addressing, control and power supply.

Bus cycle time

Time required for a master to serve all slaves or stations in a bus system, i. e. reading inputs and writing outputs.

D301087 1211 - BL20 CANopen 9-1

Glossary

CDE

Bus line

Smallest unit connected to a bus, consisting of a PLC, a coupling element for modules on the bus and a module.

Bus system

All units which communicate with one another via a bus.

Capacitive coupling

Electrical capacitive couplings occur between cables with different potentials. Typical sources of interference are,
e. g. parallel-routed signal cables, contactors and electrostatic discharges.

Class

A group of Objects that all describe the same system components. All Objects of a Class are identical in form and
behavior, they can though contain different attributes.

COB

Communication Object, which is made of one or more CAN frames. Any information transmitted via CANopen has
to be mapped into COBs (Source: CiA
DS 401 V2.1).

COB-ID

COB-Identifier. Identifies a COB uniquely in a CAN network. The identifier determines the priority of that COB in
the data link layer, too (Source: CiA
DS 401 V2.1).

Coding elements

Two-piece element for the unambiguous assignment of electronic and base modules.

Configuration

Systematic arrangement of the I/O modules of a station.

CPU

Central Processing Unit. Central unit for electronic data processing, the processing core of the PC.

Cyclic

Messages are triggered time-controlled in Cyclic I/O connections by means of a time generator.

Digital

A value (e. g. a voltage) which can adopt only certain statuses within a finite set, mostly defined as 0 and 1.

DIN

German acronym for German Industrial Standard.

EDS

Electronic Device Data Sheet which contains standardized DeviceNet station descriptions. They simplify the
planning of the DeviceNet nodes.

EIA

Electronic Industries Association – association of electrical companies in the United States.

D301087 1211 - BL20 CANopen9-2

Electrical components

FGH

I

All objects that produce, convert, transmit, distribute or utilize electrical power (e. g. conductors, cable, machines,
control devices).

EMC

Electromagnetic compatibility – the ability of an electrical part to operate in a specific environment without fault
and without exerting a negative influence on its environment.

EN

German acronym for European Standard.

ESD

Electrostatic Discharge.

Field power supply

Voltage supply for devices in the field as well as the signal voltage.

Fieldbus

Data network on sensor/actuator level. A fieldbus connects the equipment on the field level. Characteristics of a
fieldbus are a high transmission security and real-time behavior.

Force Mode

Software mode which enables the user to set his plant to a required state by forcing certain variables on the input
and output modules.

GND

Abbreviation of ground (potential "0").

Ground

Expression used in electrical engineering to describe an area whose electrical potential is equal to zero at any
given point. In neutral grounding devices, the potential is not necessarily zero, and one speaks of the ground
reference.

Ground connection

One or more components that have a good and direct contact to earth.

Ground reference

Potential of ground in a neutral grounding device. Unlike earth whose potential is always zero, it may have a
potential other than zero.

Hexadecimal

System of representing numbers in base 16 with the digits 0... 9, and further with the letters A, B, C, D, E and F.

Hysteresis

A sensor can get caught up at a certain point, and then "waver" at this position. This condition results in the
counter content fluctuating around a given value. Should a reference value be within this fluctuating range, then
the relevant output would be turned on and off in rhythm with the fluctuating signal.

I/O

Input/output.

D301087 1211 - BL20 CANopen

9-3

Glossary

LMMOP

Impedance

Total effective resistance that a component or circuit has for an alternating current at a specific frequency.

Inactive metal components

Conductive components that cannot be touched and are electrically isolated from active metal components by
insulation, but can adopt voltage in the event of a fault.

Inductive coupling

Magnetic inductive couplings occur between two cables through which an electrical current is flowing. The
magnetic effect caused by the electrical currents induces an interference voltage. Typical sources of interference
are for example, transformers, motors, parallel-routed network and HF signal cables.

Instance

An Instance is defined as being an Object that is actually set up in a device.

Load value

Predefined value for the counter module with which the count process begins.

Lightning protection

All measures taken to protect a system from damage due to overvoltages caused by lightning strike.

Low impedance connection

Connection with a low AC impedance.

LSB

Least Significant Bit

Mass

All interconnected inactive components that do not take on a dangerous touch potential in the case of a fault.

Module bus

The module bus is the internal bus in a BL20 station. The BL20 modules communicate with the gateway via the
module bus which is independent of the fieldbus.

MSB

Most Significant Bit

NMT

see chapter 3 Short description of CANopen (Seite 3-1).

Overhead

System administration time required by the system for each transmission cycle.

PDO

see chapter 3 Short description of CANopen (Seite 3-1).

PLC

Programmable Logic Controller.

D301087 1211 - BL20 CANopen9-4

Polling

R

S

Establish a Polled I/O Connection, i. e. a conventional Master/Slave relationship between a controller and a
DeviceNet device.

Potential compensation

The alignment of electrical levels of electrical components and external conductive components by means of an
electrical connection.

Potential free

Galvanic isolation of the reference potentials in I/O modules of the control and load circuits.

Potential linked

Electrical connection of the reference potentials in I/O modules of the control and load circuits.

Protective earth

Electrical conductor for protection against dangerous shock currents. Generally represented by PE (protective
earth).

Radiation coupling

A radiation coupling appears when an electromagnetic wave hits a conductive structure. Voltages and currents
are induced by the collision. Typical sources of interference are e. g. sparking gaps (spark plugs, commutators
from electric motors) and transmitters (e. g., radio), that are operated near to conducting structures.

Reaction time

The time required in a bus system between a reading operation being sent and the receipt of an answer. It is the
time required by an input module to change a signal at its input until the signal is sent to the bus system.

SDO

see chapter 3 Short description of CANopen (Seite 3-1).

D301087 1211 - BL20 CANopen

9-5

Glossary

D301087 1211 - BL20 CANopen9-6

10 Index

A

addressing

B

BL20 gateway
–function

bus connection ............................................................7-11

C

cable types

CANopen ........................................................................ 3-1

–Boot-up message ......................................................... 3-3

–Communication ........................................................... 3-3

–EDS file .......................................................................... 3-6

–Emergency object (Emcy) ............................................ 3-4

–General ......................................................................... 3-2

–Network management messages ............................... 3-3

–Process data objects (PDOs) ........................................ 3-4

–Service data objects (SDOs) ......................................... 3-3

–Special function objects .............................................. 3-4

–Synchronization object ................................................ 3-4

–Time stamp object (Time) ............................................3-4

D

diagnostic messages

Division 2 ........................................................................8-1

......................................................................4-2

........................................................................4-3

.....................................................................7-3

....................................................4-20

N

Node-ID

Node-ID setting ............................................................4-17

P

parameter assignment

PE connection .................................................................7-5

planning ..........................................................................6-2

potential relationships ...................................................7-4

potential-compensation cable .......................................7-9

power distribution ..........................................................2-3

power supply ..................................................................6-4

Process data objects (PDOs) ...........................................3-4

product overview ...........................................................2-1

R

Rotary encoding switches
–decimal

–hexadecimal ...............................................................4-17

S

service interface

shielding .........................................................................7-8

status displays .................................................................4-2

status indicators ...........................................................4-19

Supply voltage ................................................................4-8

.........................................................................4-17

...................................................4-2

.......................................................................4-17

............................................................4-14

E

earth-free operation

electromagnetic compatibility ...................................... 7-5

electronic modules ........................................................ 2-4

electrostatic discharge .................................................7-10

EMC .................................................................................7-5

empty slot ....................................................................... 6-2

ESD, electrostatic discharge ........................................7-10

F

Fieldbus connection
–Direct wiring

–Open Style connector ................................................ 4-12

G

gateway

gateway function ...........................................................4-3

I

inductive loads, protective circuit

L

LEDs

M

mounting rail

.......................................................................... 2-3

.............................................................................. 4-20

.......................................................7-5

...............................................................4-10

............................... 7-10

..................................................................7-6

T

transmission cables

Z

.............................................................................8-1

Zone 2

........................................................7-3

D301087 1211 - BL20 CANopen 10-1

Index

D301087 1211 - BL20 CANopen10-2

www.turck.com

Hans Turck GmbH & Co. KG

45472 Mülheim an der Ruhr
Germany
Witzlebenstraße 7
Tel. [phone]
Fax [phone]
E-Mail [e-mail]
Internet www.turck.com

D301087 1211