D2–DCM Data Communication Module
Contents
1.2. The exclamation mark icon in the left hand margin indicates a warning or caution These are very important because the information may help you prevent serious personal injury or equipment damage The beginning of each chapter will list the key topics that can be found in that fe chapter Data Communications Module 2nd Edition 2 03 Introduction D2 DCM Hardware The following diagram shows the major D2 DCM components The address selection switches and the communication dipswitches are of special importance n N Status Indicators N DATA H shown below on wE Eok A NK Eea To C Cero OFF ma or Base Connector D2 DCM Online Offline Switch Je RS232C RS422 Communication Port Address Selection Switches L DIP Switches for communications 5a and protocol parameters D00000 00000 G 0000000 000000 tati T FE PARREREN RERE No NO ol bo ol bk 7 4 Na D eD SS ESEA N eLo srez Self Test Indicator ON Send Receive Enquiry FLASHING Send Receive Header FLASHING Send Receive Data Packet FLASHING Module Power ON NK ON if a NAK is either sent or received TO ON if a timeout has occurred in the D2
3. DCM Master Mode ON if master Dan OFF if slave Status Indicators During communications only The DL205 Data Communications Module D2 DCM is a general purpose communications interface that can be used in a DL205 system that has a D2 240 250 1 260 Central Processing Unit CPU The D2 DCM cannot be used with a DL230 CPU The module can go in any base slot except for Slot 0 which is next to the CPU This module is primarily used for three reasons e As a network master or slave interface to a DirectNET network e Asan extra general purpose communications port to connect a personal computer or operator interface e As a network interface to a MODBUS network using the RTU protocol Data Communications Module 2nd Edition 2 03 Applications As a DirectNET Interface Introduction 5 The D2 DCM can be used as a network interface for applications that require data to be shared between PLCs or between PLCs and an intelligent device such as a host computer The D2 DCM can be configured as either a master or slave station and allows you to upload or download virtually any type of system data including Timer Counter data I O information and V memory information DirectNET Masters Issue requests to slave stations Sh Response a f S PC or D2 DCM s8 master can communicate with ai DirectNET Slaves S A C L j Request Using a D2 DCM as a Network
4. use your D2 DCM to communicate with another PLC you will need the appropriate user manual for the other PLC If you plan to use your D2 DCM module as an interface to HMI or PC Control software or to an Operator Interface panel you will need to refer to the documentation for that product If you need an additional communications port for your DL205 PLC and you understand the basics of installing and programming PLCs this is the right manual for you This manual gives you the information you need to set up an active port on the D2 DCM module We strive to make our manuals the best in the industry and rely on your feedback in reaching our goal If you cannot find the solution to your particular application or if for any reason you need additional technical assistance please call us at 770 844 4200 Our technical support team is glad to work with you in answering your questions They are available weekdays from 9 00 a m to 6 00 p m Eastern Time We also encourage you to visit our website where you can find technical and nontechnical information about our products and our company www automationdirect com Data Communications Module 2nd Edition 2 03 Conventions Used YZ H n S Key Topics for Each Chapter Introduction 3o The light bulb icon in the left hand margin indicates a tip or shortcut The note pad icon in the left hand margin indicates a special note
5. D2 DCM Data Communication Module In This Manual Introduction Building the Communication Cable Setting the D2 DCM Switches Installing the D2 DCM and Starting the Network Verification and Troubleshooting Data Communications Module 2nd Edition 2 03 2 Introduction Overview The Purpose of this Manual Supplemental Manuals Who Should Read this Manual Technical Support This manual is designed to allow you to setup and install your DL205 Data Communications Module D2 DCM This is the only manual you will need if you are using the D2 DCM as an extra general purpose communication port for your DL205 PLC system If you plan on using the D2 DCM as a network master or slave for a DirectNET network this manual covers the basic steps for setting up the D2 DCM and the RX WxX instructions needed in your RLL program If you plan on using a personal computer as the network master it may be helpful to read the DirectNET manual first In either case the DirectNET manual can be useful because it provides detailed descriptions of network configurations various cable connections etc Depending on which products you have purchased there may be other manuals that are necessary or helpful for your application These are some suggested manuals User Manuals e DirectNET Network Guide part number DA DNET M e DirectSoft32 Programming Software part number PC DSOFT32 M If you plan to
6. Master The DL205 D2 DCM can be used with a D2 240 250 1 260 CPU to serve as a network master Your CPU must have firmware V1 8 or later It cannot be used with a DL230 CPU A master is the network station that initiates requests for data from other stations on the network You simply use special RLL instructions RX and WX inside of your RLL program to initiate the data exchange The D2 DCM takes communication requests issued by the PLC program instructions and automatically converts these requests into network commands that read data from or write data to another network station DirectNET Slaves Slaves respond to the master s request Possible Slaves D2 240 250 1 260 CPU bottom port D2 240 250 1 260 w D2 DCM D3 330 or D3 330P w DCU D3 340 either port D4 430 bottom port D4 440 bottom port D4 450 phone jack or bottom port Any DL405 CPU w D4 DCM The PLC program is really very simple and only requires a few instructions Appendix A provides an overview of the instructions Or see the DirectNET Manual for network details Using a D2 DCM as a Network Slave The D2 DCM can also be used with a D2 240 250 1 260 CPU to serve as a network slave station It cannot be used with a DL230 CPU In this case the D2 DCM listens to the network for any messages that contain the D2 DCM s address The D2 DCM deciphers the network com
7. mands carries out the request to read or write data and sends confirmation and or information to the master station Possible Masters D2 240 250 1 260 w D2 DCM D3 340 CPU bottom port Any DL405 CPU w D4 DCM D4 450 CPU bottom port Host computer w DirectSOFT DSData Server Data Communications Module 2nd Edition 2 03 6 Introduction As an Extra Communication Port As a MODBUS Network Interface As an extra communication port the D2 DCM supports the DirectNET protocol just like the bottom port on the D2 240 250 1 260 CPU but at higher baud rates In general if you can connect a device to the bottom port on the D2 240 250 1 260 CPU then you can also connect the same device to the D2 DCM These devices can be a variety of things such as operator interfaces or personal computers Since the D2 DCM does not require any programming you can simply set the D2 DCM communication parameters connect the appropriate RS232C or RS422 cables and start transferring data Quickly add extra communication ports Number of D2 DCMs is lim ited by the available power budget The D2 DCM can be used as a slave interface to connect your DL205 system to a MODBUS network using the MODBUS RTU protocol The host system must be capable of issuing the MODBUS commands to read or write the appropriate data Appendix C provides additional infor
8. mation on using the D2 DCM as a MODBUS slave interface This manual does not describe the MODBUS protocol We recommend that you reference the Gould MODBUS Protocol Reference Guide P1 MBUS 300 Rev B for details on the protocol There may be more recent editions of this manual so check with your MODBUS supplier before ordering the documentation MODBUS Master fal Network EE As a slave station Network Slave H responding to network re Slave quests with D2 DCM Data Communications Module 2nd Edition 2 03 Specifications Environmental Specifications Introduction Operating Temperature 32 F to 131 F 0 to 55 C Storage Temperature 4 F to 158 F 20 to 80 C Operating Humidity 5 to 95 non condensing Air Composition No corrosive gases permitted Vibration JIS C0040 Shock JIS C0041 Voltage Isolation 1500 VAC 1 minute duration Insulation Resistance 10M ohms at 500 VDC Noise NEMA ICS3 304 Operating Specifications Power Budget Requirement 300ma 5 VDC Maximum number of modules limited only by power budget CPU Required D2 240 250 1 260 minimum firmware V1 8 or later Location of module CPU base only any slot except Slot 0 or CPU slot Interface Serial RS232C RS422 half duplex DTE Asynchronous 8 bits character odd or no pari
9. ty Baud Rates 300 to 38 4K baud switch selectable Maximum Distance RS232C 49ft 15 meters RS422 3300 feet 1000 meters Protocol DirectNET K sequence proprietary MODBUS RTU Diagnostics Automatic check of ROM RAM communications switch settings and LEDs Note 1 Also compatible with Hostlink and or CCM2 protocols These names were used by previous vendors of compatible Koyo designed products Data Communications Module 2nd Edition 2 03 8 Introduction Using your D2 DCM Five Steps STEP 1 Familiarize yourself with the communications options of D2 DCM in the Introduction STEP 2 Build the communication cable that fits your needs STEP 3 Set the D2 DCM switches Baud rate parity etc STEP 4 Install the D2 DCM in any slot except for Slot 0 which is next to the CPU STEP 5 Verify correct network operation by using the indicators and the troubleshooting chart Data Communications Module 2nd Edition 2 03 6 0000000000 000000000 000 G 000 Install eS Ot UF gm nop o000 an s on wE Eok A NK TO 1 OFF MALL D2 DCM
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