782-JDM DeviceNet™-Modbus Gateway User’s Manual Western Reserve Controls, Inc.
Western Reserve Controls PUB 24.0 1782-JDM User’s Manual 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 24.0 Rev 1.01 June 2000 Copyright © 1999, 2000 WRC Western Reserve Controls, Inc.
Western Reserve Controls PUB 24.0 1782-JDM User’s Manual TABLE OF CONTENTS 1 OVERVIEW ....................................................................................................................................................... 1 1.1 FEATURES ......................................................................................................................................................... 1 1.2 DEVICENET SYSTEM ARCHITECTURE ................................................................
Western Reserve Controls PUB 24.0 1782-JDM User’s Manual TABLE 3-4 NETWORK MAXIMUM LENGTHS ............................................................................................................... 10 TABLE 3-5 DEVICENET WIRING TERMINATION ......................................................................................................... 11 TABLE 3-6 DEVICENET CONDUCTOR SIZES ...............................................................................................................
Western Reserve Controls PUB 24.0 1782-JDM User’s Manual PRELIMINARY 1 Overview The 1782-JDM is a family of DeviceNet-to-Modbus interfaces that allows you to easily connect and integrate a Modbus-capable device into a DeviceNet system. The Modbus device’s real-time data is read and written as I/O by the DeviceNet Master via Polled I/O. The devices set up parameters, if any, can be read and written with the Explicit Messaging technique.
Western Reserve Controls PUB 24.0 1782-JDM User’s Manual • Operates independently of operation of Modbus device • Forwards the message received without interpretation • Each JDM communicates with one or more Modbus devices • ODVA Conformance tested to DeviceNet Spec 2.
Western Reserve Controls PUB 24.0 1782-JDM User’s Manual for each message. Therefore, each message to a Modbus device has 2 addresses associated with it – the DeviceNet address of the JDM and the Modbus address of the specific device. Table 1-1 Data Message Options I/O Type Polled Modbus Device Commands √ Modbus Status √ Device Cyclic Bit-Strobe Change-of-State Explicit Message √ Modbus Device Parameters The following sections describe how the data is accessed. 1.3.
Western Reserve Controls PUB 24.0 1782-JDM User’s Manual 1.4 Default Device Configuration The JDM DeviceNet address is read from the switches and is set to 63 at the factory. All other parameters are software settable. The default settings for the JDM are provided in the discussion of the Parameter Object. 1.5 EDS An EDS (Electronic Data Sheet), which describes the various parameters of the JDM, is shipped with your device or is available on WRC’s web site: http://www.wrcakron.
Western Reserve Controls PUB 24.0 1782-JDM User’s Manual 2 Quick Start To quickly and easily install your JDM in your DeviceNet system, follow the instructions below. For more details, see Section 2.3. To Install and Establish DeviceNet Communications 1. Connect the DeviceNet cable to the 5-pin plug (supplied) according to DeviceNet cable wiring specifications. 2. Make sure that the DeviceNet network is terminated properly. (See Section 3.5 below.) 3.
Western Reserve Controls PUB 24.0 1782-JDM User’s Manual 2.2 How to Change the DeviceNet Baud Rate 1. The baud rate defaults to autobaud. You can change the baud rate in software to a fixed baud rate using your configuration tool or any command from the Master. 2. If you change the baud rate, the new baud rate will not become effective until the unit is power cycled or a Reset command is received from the Master. 2.3 How to Install the Modbus Device Network 1.
Western Reserve Controls PUB 24.0 1782-JDM User’s Manual Each time a new message is received at the JDM from the Modbus network, it will increment the counter. 7. The second byte of the record will be a status byte. This is a combination of the status of the received Modbus message and the JDM’s error detection system.
Western Reserve Controls PUB 24.0 1782-JDM User’s Manual 3 Hardware Installation and Configuration 3.1 Overview The ASCII contains two LEDs to indicate the status of the device and the status of the network. The device can be connected to the main DeviceNet trunk line or to a drop line via screw terminations on the open, pluggable 5-pin DeviceNet connector supplied with your unit. The serial link, RS232 or RS485, is connected via an open, pluggable 3-pin connector. 0.984 (25) 3.540 (89.9) 0.
Western Reserve Controls PUB 24.0 1782-JDM User’s Manual Table 3-1 Module Status LED (labeled MS) LED State Module Status Meaning OFF No Power There is no power through DeviceNet. Green Device Operational ASCII is operating normally. Flashing Green Device in Standby Flashing Red Minor Fault If in autobaud, ASCII is waiting for a sync signal. (If fixed baud mode, ASCII needs commissioning. Future.) Recoverable fault. Red Unrecoverable Fault ASCII may need replaced.
Western Reserve Controls PUB 24.0 1782-JDM User’s Manual Table 3-3 Serial Port Connections Pin # RS232 Signal RS485 Signal Designator 1 Transmit Signal + SIG+ 2 Receive Signal - SIG- 3 Ground Ground GND 3.4 Power Requirements 3.4.1 Device power The ASCII is powered directly from the DeviceNet connection 11-25 Vdc power supply. The ASCII-1 and ASCII-2 consume 67 mA of current at 24 Vdc, or 1.8 Watts, typical.
Western Reserve Controls PUB 24.0 • • 1782-JDM User’s Manual 1% metal film 1/4 Watt An appropriate terminating resistor kit, WRC part number RM121DN, is included with your JDM. Important: Per the DeviceNet spec -- do not terminate devices on drop lines. 3.5.2 DeviceNet Connection Wiring The supplied DeviceNet connection plug accepts cable sizes from 12 AWG - 24 AWG. The maximum wire size (12 AWG) has an area of 653O circular mils and the smallest (24 AWG) has an area of 3265 circular mils.
Western Reserve Controls PUB 24.0 1782-JDM User’s Manual Table 3-6 DeviceNet Conductor Sizes Function Thick Wire Thin Wire Power 15 AWG 22 AWG Signal 18 AWG 24 AWG Figure 3-2 DeviceNet cable connector Figure 3-3 DeviceNet cable specifications 3.6 Software Configuration A ASCII Multiplexer is software-configured for several parameters.
Western Reserve Controls PUB 24.0 1782-JDM User’s Manual Table 3-7 Configuration Parameters Parameter Param.
Western Reserve Controls PUB 24.0 1782-JDM User’s Manual 1. Modbus Mode: The JDM can operate in either the ASCII or RTU mode for Modbus communications. 2. Rx Data Length: Maximum number of bytes expected from the remote Modbus device. 3. Tx Data Length: Maximum number of bytes to be sent to the remote Modbus device 4. Modbus Baud rate: The communications speed of the RS232 or RS485 link. 5. DeviceNet Baud rate: The selection of the baud rate is independent of any other parameter. 6.
Western Reserve Controls PUB 24.0 1782-JDM User’s Manual 4 DeviceNet I/O Assembly Formats The following tables define the format of the DeviceNet data sent to and received from the JDM. The exact format of the output and input data that is sent from and received at your DeviceNet master is defined by the Modbus command used. The following tables provide the general format and illustrate the differences between the ASCII and RTU modes.
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Western Reserve Controls PUB 24.0 1782-JDM User’s Manual PRELIMINARY 5 General Specifications Product: 1782-JDM – DeviceNet-to-Modbus Gateway Description: Communications gateway between a Modbus device over an RS232 or RS485 network and a DeviceNet network.
Western Reserve Controls PUB 24.0 1782-JDM User’s Manual Phoenix Contact MSTBA 2.5/5-G-5.08/AU or equivalent DeviceNet Cable: 5-contact plug (female contacts) Phoenix Contact MSTB 2.5/5-ST-5.08/AU or equivalent (included) Status Indicators: Module Status: green/red bi-color LED Network Status: green/red bi-color LED Network Termination: External terminating resistor (optional per user system configuration) Serial port: Baud rate: 300, 600, 1200, 2400, 4800, 9600, 19.2k, 39.
Western Reserve Controls PUB 24.0 1782-JDM User’s Manual 6 Accessories and Other WRC Products The following components can be used with a 1782-JDM-x for replacements or spare parts, or as complementary devices as a part of your DeviceNet system.
Western Reserve Controls PUB 24.0 1782-JDM User’s Manual 7 Troubleshooting This section identifies some of the common problem observed when commissioning or operating a DeviceNet and JDM. Problem: JDM powers up, then the module status LED turns Red. JDM does not communicate over the network. Possible Solutions: 1. JDM has detected a duplicate MacID (DeviceNet address). Change the JDM’s MacID to an unused address and cycle power.
