Chapter 1 - AutomationDirect
Contents
1. Introduction Operating Temperature 32 F to 140 F 0 to 60 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 MIL STD 810C 514 2 Shock MIL STD 810C 516 2 Voltage Isolation 1500 VAC 1 minute duration Insulation Resistance 10M ohms at 500 VDC Noise NEMA ICS3 304 Power Budget Requirement 500 ma 5 VDC Maximum number of modules limited only by power budget 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 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 8 Introduction Using your DCM Five Steps Complete the following steps to connect the DCM STEP 1 Familiarize yourself with the communications options of DCM in the Introduction STEP 2 Build the communication cable that fits your needs STEP 3 Set the2. Network Interface As an extra communication port the DCM has specifications similar to the bottom port on the DL405 PLCs Plus the DCM can communicate at higher baud rates If you can connect a device to the bottom port on the DL405 PLC then you can also connect the same device to the DCM These devices can be a variety of things such as operator interfaces or personal computers Since the DCM does not require any programming you can simply set the DCM communication parameters connect the appropriate RS232C or RS422 cables and start transferring data Quickly add extra Communication ports The DCM can be used as a slave station interface to connect your DL405 system to the 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 This manual does not describe the Modbus protocol You must reference the Gould Modbus Protocol Reference Guide for details P1 MBUS 300 Rev B There may be more recent editions of this manual so check with your Modbus supplier before ordering the documentation A cross reference for the Data Types is supplied later in this manual Modbus Master J Network Slave Network Slave As a slave station DL405 Slave responding to network requests with DCM Specifications Environmental Specifications Operating Specifications
3. DCM switches Baud rate parity etc STEP 4 Install the DCM m OK NAK O ENQ TOUTO HDR DATA STEP 5 Verify correct network operation SE
4. Introduction In This Section Overview DCM Hardware Applications Specifications Using the DCM Five Steps 2 Introduction Overview The Purpose of this Manual Supplemental Manuals Who Should Read this Manual Quality Technical Manuals and Technical Support This manual is designed to allow you to setup and install your DL405 Data Communications Module DCM This is the only manual you will need if you are using the DCM as an extra general purpose communication port for your DL405 PLC system If you plan on using the DCM as a network master or slave on a DirectNET network we suggest that you read the DirectNET manual first The DirectNET manual provides detailed descriptions of network configurations protocol and the PLC programs that are necessary to control communications with the DCMs 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 DirectSoft Programming Software part number DA DSOFT M If you plan to use your D4 DCM to communicate with
5. ally any type of system data including Timer Counter data I O information and V memory information Using a DCM as part of a PLC Network Master The DCM can be used in a DL405 PLC station that is serving as a network master A master is the network station that initiates requests for data from other stations on the network The DCM takes communication requests issued from the PLC program and automatically converts these requests into network commands that read data from or write data to another network station The PLC program is really very simple and only requires a few instructions You do not have to be a PLC programming guru to use the network Appendix A provides an overview of the instructions used If you want even more information see the DirectNET Manual Using a DCM as part of a PLC Network Slave The DCM can also be used ina DL405 PLC station that is serving as a network slave station In this case the DCM listens to the network for any messages that contain the DCM s address The DCM deciphers the network commands carries out the request to read or write data and sends confirmation and or information to the master station DirectNET Slaves Slaves respond to the master s request Response Communicate with either a PC or DirectNET Slaves Request eae Introduction As an Extra Communication Port As a Modbus
6. another PLC you will need the appropriate user manual for the other PLC If you plan to use your D4 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 D4 DCM module We strive to make our manuals the best in the industry We rely on your feedback to let us know if we are reaching our goal If you cannot find the solution to your particular application or if for any reason you need additional assistance please call us at 800 633 0405 Our technical support group 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 You can also contact us on the worldwide web at http www plcdirect com PLCDirect Web site for general info file transfers You can also find a variety of support solutions at our 24 hour per day BBS at 770 844 4209 If you find a problem with any of our products services or manuals please fill out and return the Suggestions card that came with this manual Steps Introduction 3 The main contents of this manual are organized into five steps Introduction tells you about the Data Communic
7. ation Module and its uses It lists other manuals you may need and tells you how to get additional technical assistance if necessary Build the Cable guides you through building the necessary communication cable covering physical and electrical specifications Set the DCM Switches guides you through the setup of the rotary and DIP switches to select communication parameters and network addressing It shows the proper method of inserting the module into the base Install the DCM and Start the Network tells you what to consider when laying out your network cable and how to terminate the individual conductors at the networked devices It gives you specific cabling examples showing pinouts for each device Verify and Troubleshoot introduces the use of the DCM s status indicator lights as a diagnostic tool It gives you status indicator light patterns to help you identify problems that could be preventing communications Appendix A Additional reference information for the D4Q DCM is available in this appendix RLL Communications Programs provides helpful examples of Ladder Logic programs for DCM communications Introduction DCM Hardware The following diagram shows the major DCM components The address selection switches and the communication dipswitches are of special importance EN mO Da Status Indicators mr O shown below mO Ooa Base Connector 4 Onlin
8. e Offline Switch D Address Selection Switch DIP Switches for communications and protocol parameters ERRER _ _ RS232C RS422 Communication Port NK EV Status Indicators Huk ma Self Test Indicator ON Module Power Send Receive Enquiry NAK ON if a NAK is pwr E ER oK FLASHING either sent or received NAK G Send Receive Header TOUT FLASHING l TOUT ON if a timeout vstR iB aa eden Dats has occurred in the DCM Packet FLASHING Master Mode ON if master OFF if slave DCM Uses The DL405 Data Communications Module DCM is a general purpose communications interface for the DL405 family of Programmable Logic Controllers PLCs This module is primarily used for three reasons e Asa network interface to a DirectNET network e As an 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 The following pages provide an overview of these uses along with the information you need to connect the DCM Introduction 5 Applications As a DirectNET The DCM can be used as a network interface for applications that require data to be Interface shared between PLCs or between PLCs and an intelligent device such as a host computer The DCM easily connects to DirectNET This network allows you to upload or download virtu
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