Western Reserve Controls WRC-CANR-DF User manual

WRC-CANR-DF
CAN-Bus Fiber Optic Bus Extender
User’s Manual
Western Reserve Controls, Inc.

Western Reserve Controls WRC-CANR-DF-DN User’s Manual
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Although every effort has been made to insure the accuracy of this document, all information is subject to
change without notice. WRC takes no liability for any errors in this document or for direct, indirect,
incidental or consequential damage resulting from the use of this manual.
Document PUB 14.1
Rev 1.08
March 2002
Copyright © 1998-2002 WRC
Western Reserve Controls, Inc.
1485 Exeter Road
Akron OH 44306
330-733-6662 (Phone)
330-733-6663 (FAX)
[email protected] (Email)
http://www.wrcakron.com (Web)
SmartMux-Lite, CAN-Bus Extender and WRC are trademarks of Western Reserve Controls, Inc.
DeviceNet is a trademark of the Open DeviceNet Vendor Association, Inc. (“ODVA”).
SDS is a trademark of the Honeywell, Inc.
All other trademarks are property of their respective companies.

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TABLE OF CONTENTS
1. OVERVIEW ............................................................................................................................................................................1
1.1. FEATURES............................................................................................................................................................................1
1.2. BASIC OPERATION.............................................................................................................................................................2
1.3. REFERENCE DOCUMENTS.................................................................................................................................................2
2. QUICK START.......................................................................................................................................................................3
3. GENERAL SPECIFICATIONS............................................................................................................................................4
4.HARDWARE INSTALLATION AND CONFIGURATION............................................................................................5
4.1. OVERVIEW...........................................................................................................................................................................5
4.2. LED OPERATION................................................................................................................................................................5
4.3. DIP SWITCH SETTINGS.....................................................................................................................................................7
4.3.1. Slide Swith version.................................................................................................................................................7
4.3.2. Piano Switch Version.............................................................................................................................................8
4.4. POWER REQUIREMENTS....................................................................................................................................................8
4.5. NETWORK CABLING AND CONFIGURATION..................................................................................................................9
4.5.1. Cable Lengths..........................................................................................................................................................9
4.5.2. Network Termination.............................................................................................................................................9
4.5.3. CAN-Bus Connection Wiring..............................................................................................................................10
4.5.4. Alternate Connector Options..............................................................................................................................12
5. OPERATION........................................................................................................................................................................13
5.1. APPLICATION NOTES......................................................................................................................................................13
6. ACCESSORIES AND OTHER WRC PRODUCTS.......................................................................................................15
7. TROUBLESHOOTING.......................................................................................................................................................17

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LIST OF TABLES
TABLE 2-1 BAUD RATE SETTINGS.................................................................................................................................................3
TABLE 4-1 MODULE STATUS LED (LABELED MS)....................................................................................................................6
TABLE 4-2 NETWORK STATUS LEDS (LABELED NSA AND NSB)...........................................................................................6
TABLE 4-3 DIAGNOSTIC STATUS LEDS (LABELED DNG)..........................................................................................................6
TABLE 4-4 BAUD RATE SETTINGS –SLIDE SWITCH ONLY......................................................................................................7
TABLE 4-5 BAUD RATE SETTINGS –PIANO SWITCH ONLY....................................................................................................8
TABLE 4-6 NETWORK MAXIMUM LENGTHS -DEVICENET......................................................................................................9
TABLE 4-7 NETWORK MAXIMUM LENGTHS -SDS....................................................................................................................9
TABLE 4-8 TERMINATING RESISTORS..........................................................................................................................................10
TABLE 4-9 DEVICENET CABLE SPECIFICATIONS........................................................................................................................11
TABLE 4-10 SDS CABLE SPECIFICATIONS...................................................................................................................................12
TABLE 6-1 ACCESSORIES AND OTHER WRC PRODUCTS..........................................................................................................16
LIST OF FIGURES
FIGURE 4-1 WRC-CANR-DF-DN CAN-BUS EXTENDER...........................................................................................................5
FIGURE 4-2 DIP SWITCH SETTINGS –SLIDE SWITCH ONLY....................................................................................................7
FIGURE 4-3 DIP SWITCH SETTINGS –PIANO SWITCH ONLY..................................................................................................8
FIGURE 4-4 LOCATION OF TERMINATING RESISTOR ON NETWORK SIDE A........................................................................10
FIGURE 4-5DEVICENET NETWORK SIDE A CABLE CONNECTOR –MALE (PINS).................................................................11
FIGURE 4-6 SDS MINI CONNECTOR...........................................................................................................................................11
FIGURE 5-1 CANR-DF ON A DROP LINE.....................................................................................................................................13
FIGURE 5-2 CANR-DF ON TRUNK LINE AND DROP ..................................................................................................................14

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1. Overview
The WRC-CANR-DF-DN Fiber Optic CAN Bus Extender converts a copper cable medium CAN-Bus
network to a fiber optic medium. The WRC-CANR-DF-DN is always used in pairs and, along with the fiber
optic cable set, inserts a length of fiber media into the copper CAN Bus network. It typically is used to
convert a section of the CAN bus to a pair of fiber optic cables. The primary purposes of configuration is to
extend the maximum length defined for one continuous network cable bus and to provide network protection
from external, high-energy electrical interference, such as lightning storms, arc welders, etc. They can be
connected in a bus trunk line or drop line.
The Extenders are transparent to the other nodes on the bus. They receive and actively re-transmit
(store-and-forward) each message received at either side of the network without interpreting the message or
acting upon it. The Fiber Extenders perform all appropriate CAN Bus arbitration on the copper bus as it re-
transmits the message.
The WRC-CANR-DF-DN is a member of WRC’s family of products that extend the system
communications lengths for DeviceNet, SDS (Smart Distributed System) and other CAN, V2.0, Part A,
serial bus systems. By allowing the user to extend the bus length for any given speed, they assist the user
in cost-effectively implementing I/O or other nodes on these buses at remote locations that would be more
difficult or more expensive to do otherwise.
The unit derives its power through the copper network connector on Side A.
1.1. Features
The WRC-CANR-DF-DN has the following features:
•Extends CAN-Bus cable lengths -trunk line or drop lines
•Expands the usable applications for CAN-Bus systems
•Allows operation at higher speeds for specific distances
•Provides superior electrical interference protection to copper cables
•Operates at 125K, 250K and 500K baud
•Autobaud version standard, fixed baud rate optional
•Automatic speed selection -no configuration required
•Isolates the two sections of the copper bus
•Transparent to the Master and Slave devices on the bus
•No address selection needed
•No configuration parameters
•DeviceNet; SDS; CAN, V2.0, Part A compatible
•Powered from the 24Vdc supplied by bus network or the user
•Sealed NEMA-4X enclosure
•Standard round, mini-style connector with male pins for copper cable
•Standard Fiber Optic ST female connector, 62.5/125um technology
•Standard CAN chips manage bus error detection
•Standard CAN chips handle message bus contention
•Less than 100 µsec latency
•Termination built in on cable side (may be removed by user when appropriate)
•4 bi-color (red/green) status LEDs

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•2 green fiber transmit and receive LEDs
1.2. Basic Operation
Two CANR-DF units are required for each application –a CANR-DF Type 1 and a CANR-DF Type 2.
These are similar devices that must be used in matching pairs. It does not matter which type is placed in
which position with respect to the network topology or other devices on the network.
There are two bus connections for each CANR-DF, referred to as the Copper Cable Network Side
(Side A) and Fiber Cable Network Side (Side B). The CAN Bus copper cable is connected to side A of the
CANR-DF receives its power from side A.
Error! Reference source not found. for a typical application.
Whenever a message is transmitted on the Bus to which CANR-DF is connected, CANR-DF
receives the message on the side where it was initiated and performs a store-and-forward of the message to
the other side. This action is performed in each direction and is performed for any valid CAN message
independent of who generated it or to whom it is intended.
There is approximately a 75µsec propagation delay of the message through the CANR-DF.
The CANR-DF is not addressed as a specific device on the Bus and cannot be interrogated by other
nodes. It is transparent to all other nodes on the bus.
1.3. Reference Documents
The following documents are referenced in this User’s Manual
•ODVA DeviceNet Specification Volume I, Release 2.0
•Honeywell Micro Switch Specification GS 052 104, “SDS Smart Distributed System Physical
Layer Specification”, release date 12/8/1994

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2. Quick Start
To quickly and easily install your CAN-Bus Fiber Optic Extenders in your DeviceNet system, follow
the instructions below. For more details, see Section 4.
1. These units are used in pairs. You need a CANR-DF Type 1, a CANR-DF Type 2and two (2) fiber
cable lengths, terminated with ST male connectors.
2. Set the baudrate of each CANR-DF using switches 5 and 6 on the 6-position switch block SW1.
Table 2-1Baud Rate Settings
Baudrate Switch 5 Switch 6
125k ON / CLOSED ON / CLOSED
250K ON / CLOSED OFF / OPEN
500K OFF / OPEN ON / CLOSED
Autobaud OFF / OPEN OFF / OPEN
3. Make sure that there is power on the copper CAN-Bus Network A and plug the Network A cable into the
CAN-Bus Extender on the side marked Network A.
4. The CANR-DF Extender will undergo its initialization sequence, flashing the LEDs. After approximately
5 seconds, the Module Status LED (labeled “MS”) will go on solid green and network LEDs (labeled
“NSA” and “NSB”) will flash green.
5. Connect the fiber cables to the Fiber Network Side B.
6. Connect the second CANR-DF as above. Be sure to connect the fiber from the TX port on one device to
the RX port on the other.
7. Both Network A and B Status LEDs (NSA and NSB) will go on solid on each unit once a valid CAN
message is received into either side of the Extender and the baudrate auto-detect has been
successfully performed (if applicable).
8. You may observe the small green LEDs marked RXF and TXF, next to the fiber ports, flicker when data
is received or transmitted.
9. The CAN-Bus Extenders are now operating on the network and they are ready operate in the CAN
network.
10. If the red LED marked DGN (diagnostic) blinks, this indicates that the internal message buffer on the
CANR-DF has been filled before the device could transfer all previously received messages out the other
side. Some messages may be lost. Slowing down the scan rate should help eliminate this.

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3. General Specifications
Product:WRC-CANR-DF-DN CAN-Bus Extender and Fiber Optic Converter
Description:Electrical Extender to extend the cable distances of CAN-based protocol products
and convert the copper network to a fiber optic link.
Device Type:Communications Extender
Product Revision:2.05
DeviceNet Conformance:Designed to conform to the ODVA DeviceNet Specification Volume I,
Version 2.0 and Volume II, Version 2.0.
Baud rate:125K, 250K, 500K fixed baud rate
Address selection:Not applicable
Bus Connection:Used On Device: Turck # RSF50 or equivalent, male pins, male threads
CAN-Bus Cable: See accessories list
Fiber Optic Cable:62.5/125nm, multi-mode, ST termination
Fiber Cable Length:Defined by DeviceNet speed and baud rate
See DeviceNet cable length specs
Fiber Connection:Used On Device: ST female
Fiber Cable: ST male
Status Indicators:MS -Module Status: green/red bi-color LED
NSA -Copper Network A Status: green/red bi-color LED
NSB -Fiber Network B Status: green/red bi-color LED
DGN -Diagnostic Data: green/red bi-color LED
TXF -Fiber Transmit Active: green LED
RXF -Fiber Receive Active: green LED
Voltage Isolation:Provided by fiber cable system
Maximum power:Voltage: 11 -25 Vdc
Current: 160 mA @ 11 Vdc -70 mA @ 25 Vdc
Power: 1.8 W
Mounting:Panel-mount, 4 screws
Size:Length: 5.11” (130 mm)
Depth: 2.27” (57,7 mm)
Height: 3.70” (94,0 mm)
Operating Temp:0-70 ºC
Humidity:0-95% RH, non-condensing

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4. Hardware Installation and Configuration
4.1. Overview
A CAN-Bus Extender is a single device connected to two parts of a single CAN-Bus network. The
CANR-DF is a NEMA-4X enclosure and is panel mounted.
Figure 4-1WRC-CANR-DF-DN CAN-Bus Extender
4.2. LED Operation
A WRC-CANR-DF-DN Multiplexer has six (6) LEDs that provide visual status information to the user
about the product and the DeviceNet network. See Figure 4-1, Table 4-1, Table 4-2and Table 4-3.
NSA
NSB
D8
MS
NETWORKA
NETWORKB
5.11” (130 mm)
3.70”
(94 mm)
0.30” (7,5 mm)
0.30” (7,5mm)
MINI-CONNECTOR
1.85”
(47 mm)

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Table 4-1Module Status LED (labeled MS)
LED State Module Status Meaning
OFF No Power There is no power through DeviceNet.
Green
Device Operational WRC-CANR-DF-DN is operating normally.
Flashing Green Device in Standby WRC-CANR-DF-DN is in intialization.
Flashing Red Minor Fault Recoverable fault.
Red Unrecoverable Fault WRC-CANR-DF-DN may be damaged.
Flashing Red/Green Device Self-Testing WRC-CANR-DF-DN is in self-test mode.
Table 4-2Network Status LEDs (labeled NSA and NSB)
LED State Module Status Meaning
OFF No Power / Not on-line WRC-CANR-DF-DN has no power or device
is not operating.
Flashing Green Autobaud selection The WRC-CANR-DF-DN is waiting for a valid
message to fix the baudrate.
Green
On-line WRC-CANR-DF-DN is operating normally.
Flashing Red Communications error One of several communications errors
(defined below) has occurred.
Red Critical link failure WRC-CANR-DF-DN has detected an error
which makes it incapable of communicating
on the link.
Communications errors include:
•Transmit Check
•Bus Off
•Error Passive
•Warning Level
Table 4-3Diagnostic Status LEDs (labeled DNG)
LED State Module Status Meaning
OFF No Power / Not on-line Normal operation.
Flashing Green Autobaud selection Waiting for a valid message to select the
baud rate.
Green On-line Not defined.
Flashing Red Communications error The internal FIFO stack has overflowed on
one of the network sides because the other
network could not complete
communications.

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Green LED TXF is illuminated when data is actively transmitted out to the fiber link.
Green LED RXF is on solid when its fiber cable is connected to the TX port of an active CANR-DF.
This LED flashes when data is actively received from the fiber link.
4.3. DIP Switch Settings
The WRC-CANX-XX Multiplexer has a 6-pole DIP switch. Switch positions 5 and 6 are used to set
the baud rate. (Switch positions 1-4 are reserved for future functions.)
4.3.1. Slide Swith version
Table 4-4Baud Rate Settings –SLIDE Switch Only
Baud rate Position
1-4Position 5 Position 6
125K n/a ON ON
250K n/a ON OFF
500K n/a OFF ON
Autobaud n/a OFF OFF
125k baud 250k baud
500k baud Autobaud
Figure 4-2DIP Switch Settings –SLIDE Switch Only

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4.3.2. Piano Switch Version
Table 4-5Baud Rate Settings –PIANO Switch Only
Baud rate Position
1-4Position 5 Position 6
125K n/a CLOSE CLOSE
250K n/a CLOSE OPEN
500K n/a OPEN CLOSE
Autobaud n/a OPEN OPEN
125k baud 250k baud
500k baud Autobaud
Figure 4-3DIP Switch Settings –PIANO Switch Only
4.4. Power Requirements
The WRC-CANR-DF-DN CAN-Bus Extender subsystem is powered from the 11-25 Vdc provided by
the DeviceNet network. The WRC-CANR-DF-DN consumes 70 mA of current at 24 Vdc, or 1.8 Watts,
typical. See Section 3.

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4.5. Network Cabling and Configuration
This section provides general guidelines for connecting DeviceNet and SDS systems. You can find
detailed specifications in the referenced ODVA DeviceNet and Honeywell SDS specifications.
4.5.1. Cable Lengths
The following provide cable length limits for DeviceNet and SDS systems. These numbers apply
independently to each physical section of the network, whether it is copper or fiber.
Table 4-6Network Maximum Lengths -DeviceNet
Trunk Line Length Drop Length
Maximum Distance Maximum Cumulative
Baud Rate Meters Feet Meters Feet Meters Feet
125 Kbits/s 500 m 1640 ft 6 m 20 ft 156 m 512 ft.
250 Kbits/s 250 m 820 ft 6 m 20 ft 78 m 256 ft.
500 Kbits/s 100 m 328 ft 6 m 20 ft 39 m 128 ft.
DeviceNet has a limit of 64 nodes per network for any baud rate. The CANR-DF is transparent to the
network and does not count as an addressed device. However,
Table 4-7Network Maximum Lengths -SDS
Trunk Line Length
(maximum) Drop Length (maximum)Baud Rate Meters Feet Meters Feet
No. of
Nodes
125 Kbits/s 457.2 1500 3.6 12 64
250 Kbits/s 182.8 600 1.8 664
500 Kbits/s 91.4 300 0.9 364
1 Mbits/s 22.8 75 0.3 132
SDS has a limit of 32 nodes per network for any baud rate. The CANR-DF does not count as an
addressed device.
4.5.2. Network Termination
A CAN-Bus system must be terminated at each end of a copper trunk line. The host
controller and the last node device or WRC CAN-Bus Extender on the network must always be terminated
to match impedance and eliminate reflections, even if only two nodes are present. Follow the information
below when using a CANR-DF.
Trunk line use:
For the purpose of network termination, the CANR-DF is treated as the last node on the copper
section of the trunk network (side A) to which it is connected. Therefore, when a CANR-DF is used directly

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in a trunk line, it must be terminated on side A. A terminating resistor is built into the CANR-DF, so that an
external resistor should not be added.
Drop line use:
When CANR-DF is used in a drop line line (the Network A side is toward the main trunk), the
Network A connection is not terminated. The user must remove the built-in terminator by clipping it out of
the circuit.
Some specifications for the terminating resistor are:
Table 4-8Terminating Resistors
DeviceNet SDS
121 ohm 120 ohm
1% metal film 2%
1/4 watt 1/4 watt
Important: Per the DeviceNet and SDS specs -- do not terminate devices on drop lines.
CLIP HERE.
R19
Figure 4-4Location of Terminating Resistor on Network Side A
4.5.3. CAN-Bus Connection Wiring
The CANR-DF uses the round, mini-style connector on the copper side A and standard ST
connectors on the fiber side B.

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1
2
3
4
5
Figure 4-5DeviceNet Network Side A cable connector –Male (pins)
Pin # Function Wire color
1drain bare
2V+ red
3V-black
4CAN_H white
5CAN_L blue
Table 4-9DeviceNet cable specifications
Figure 4-6SDS Mini Connector

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Pin # Function Wire color
1drain Bare
2V+ Brown
3GND Blue
4CAN_H Black
5CAN_L White
Table 4-10 SDS cable specifications
4.5.4. Alternate Connector Options
Cable sets may be purchased from an appropriate vendor or custom-made. Turck supplies individual
connectors that may be used to build custom DeviceNet or SDS copper cables. Turck part number B 4151-
0/16 is a 5-pin, 600V, 9A connector that mates with a number of cables that may be used for the Network A
side on the CANR. Contact WRC or your local Turck dealer.

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5. Operation
CANR-DF receives and stores messages received at either network connection and actively re-
transmits the message while providing 2500V isolation between the two sections of the nework. The two bus
connections for each CANR-DF are referred to as Network A (copper wire), and Network B (fiber optic
cable), but they are the same logical network with isolation between them. To extend the maximum
distance that a network.
This inclusion of the fiber network section into your CAN-Bus system requires that the the CANR-
DF units be used in pairs. And each pair consist of one Type 1 CANR-DF and one Type 2.
The CAN Bus is connected to the A Side of the CANR-DF and receives its power from the Bus.
Whenever a message is transmitted on the Bus to which the CANR-DF pair is connected, one
CANR-DF receives the message on the side where it was initiated and performs a store-and-forward of the
message to the other side. This action is performed for any valid CAN message independent of who
generated it or to whom it is intended.
There is approximately a 75 µsec propagation delay of the message through the CANR-DF.
The CANR-DF is not addressed as a specific device on the Bus and cannot be interrogated by other
nodes. It is transparent to all other nodes on the bus.
5.1. Application Notes
NOTE: CANR-DF’S ARE ALWAYS USED IN PAIRS!
To help insure ease of installation and reliable operation of your system, the following guidelines
should be followed CANR-DF installation in your CAN network.
1. Make sure the pair consists of a Type 1 and a Type 2.
2. For Autobaud versions, the baud rate each device selects will be defined by the first valid
message received from either the CAN-Bus or via the fiber connection from the other device.
3. Use only one CANR-DF pair in any network section. That is, only use one CANR-DF pair per
trunk line or drop line.
4. CANR-DF is not a grounded device and the Bus shield is not connected electrically to the
device. Therefore, follow appropriate wiring practices to eliminate noise and other problems.
Examples of valid configurations are shown in the following figures.
Figure 5-1CANR-DF on a drop line

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Figure 5-2CANR-DF on Trunk Line and Drop

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6. Accessories and Other WRC Products
The following components can be used with a JDxx for replacements or spare parts, or as complementary
devices as a part of your DeviceNet system.
Part WRC P/N Equivalent Mfr. Part Number
•CANX-NEM Cable n/a Various manufacturers’ Mini-Style Connector
Examples:
Cable assy. w/ male threads, male pins:
Turck RSM 570-*M/630 (“trunk line”)
Turck RSM 571-*M/630 (“drop line”)
•DIN rail (1 meter) WRC 50022 Phoenix Contact NS 35/7,5 0801733 (2 m)
Allen-Bradley 199-DR1 (1 m)
•Terminating resistorRM121DN 121Ω,1%, metal film, axial lead resistor

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Table 6-1Accessories and Other WRC Products
Part WRC Part Number
DIN rail WRC 50022
Terminating resistor, axial lead RM121DN
Connector, 5-pin mini-round for CANX, CANR B 4151-0/16 (Turck)
Discrete I/O block –4 channels 1782-JDB4
Discrete I/O block –8 channels 1781-JDB8
Analog Input block –4 channels, 10-bit 1782-JDA4
Analog I/O block –8 channels, 12-bit 1782-JDA8
DeviceNet to Serial I/O Gateway 1782-JDC
DeviceNet to Modbus Gateway 1782-JDM
Discrete I/O block –24 channels WRC1-JDB24
Discrete I/O block –48 channels WRC1-JDB48
Discrete I/O, Analog Input block –24 DIO, 32 AI WRC1-JDA/24
Discrete I/O, Analog Input block –48 DIO, 32 AI WRC1-JDA/48
Analog I/O block -32 channels WRC1-JDAIO
Discrete and Analog I/O block –24 DIO, 32 AIO WRC1-JDAIO/24
Discrete and Analog I/O block –48IO, 32 AIO WRC1-JDAIO/48
Discrete I/O block –8 DIs, 8 DOs, 4 AIs W5-JDB16x
DeviceNet, CANopen Extender, DIN mount WRC-CANX-DIN-DN
SDS Extender, DIN mount WRC-CANX-DIN-SD
DeviceNet, CANopen Extender, DIN mount WRC-CANX-DIN-C7
DeviceNet, CANopen Extender, NEMA box WRC-CANX-NEM-AU
DeviceNet, CANopen Extender, NEMA box WRC-CANX-NEM-DN
SDS Extender, NEMA box WRC-CANX-NEM-SD
DeviceNet, CANopen Extender, Fiber Optic, NEMA
box WRC-CANR-DF-DN