Western Reserve Controls WRC-CANR-DF User Manual
WRC-CANR-DF
CAN-Bus Fiber Optic Bus Extender
User’s Manual
W estern Reserve Controls, Inc.
Western Reserve Controls WRC-CANR-DF-DN User’s Manual
PUB 14.1
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)
sales@wrcakron.com (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.
Western Reserve Controls WRC-CANR-DF-DN User’s Manual
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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 OTHE R 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 L OCATION 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 convert s 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 retransmits 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 connec tor, 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 2 and 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 2-1 Baud 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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