D2–DCM Data Communication Module

D2–DCM Data Communication Module
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
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/WX 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.
Supplemental
Manuals
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
D
DirectNET Network Guide
part number
DA–DNET–M
D
DirectSoft32 Programming Software part number
PC–DSOFT32–M
If you plan to 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.
Who Should Read
this Manual
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.
Technical Support
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
33
Introduction
Conventions Used
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.
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.
Key Topics for
Each Chapter
The beginning of each chapter will list the
key topics that can be found in that
chapter.
1
Data Communications Module, 2nd Edition, 2/03
4
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.
Status Indicators
(shown below)
Online/Offline Switch
Base Connector
RS232C/RS422
Communication Port
Address Selection
Switches
DIP Switches for
communications
and protocol parameters
Self Test Indicator: ON
Module Power: ON
Send/Receive Enquiry:
FLASHING*
NK: ON if a NAK is
either sent or received
Send/Receive Header:
FLASHING*
Send/Receive Data
Packet: FLASHING*
TO: ON if a timeout has
occurred in the D2–DCM
Master Mode:
ON if master
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.
D
As a network master or slave interface to a DirectNET network
D
As an extra general purpose communications port to connect a personal
computer or operator interface
D
As a network interface to a MODBUSR network using the RTU protocol
Data Communications Module, 2nd Edition, 2/03
55
Introduction
Applications
As a DirectNET
Interface
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 Slaves
Slaves respond to the master’s request
DirectNET Masters
Issue requests to slave stations
Response
PC or D2–DCM
master can
communicate with
DirectNET Slaves
Request
Using a D2–DCM as a Network Master
Possible Slaves
The DL205 D2–DCM can be used with a
D2–240/250–1/260 CPU to serve as a
D
D2–240/250–1/260 CPU (bottom
network master. Your CPU must have
port)
firmware V1.8 or later. It cannot be used
D
D2–240/250–1/260 w/ D2–DCM
with a DL230 CPU. (A master is the
D
D3–330 or D3–330P w/ DCU
network station that initiates requests for
D
D3–340 (either port)
data from other stations on the network).
D
D4–430 (bottom port)
You simply use special RLL instructions (RX
and WX) inside of your RLL program to
D
D4–440 (bottom port)
initiate the data exchange. The D2–DCM
D
D4–450 (phone jack or bottom port)
takes communication requests issued by
D
Any DL405 CPU w/ D4–DCM
the PLC program instructions 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. Appendix
A provides an overview of the instructions. Or, see the DirectNET Manual for network
details.
Using a D2–DCM as a Network Slave
Possible Masters
The D2–DCM can also be used with a
D2–240/250–1/260 CPU to serve as a
D
D2–240/250–1/260
network slave station. It cannot be used
w/ D2–DCM
with a DL230 CPU. In this case, the
D
D3–340 CPU (bottom port)
D2–DCM “listens” to the network for any
D
Any DL405 CPU w/ D4–DCM
messages that contain the D2–DCM’s
address. The D2–DCM deciphers the
D
D4–450 CPU (bottom port)
network commands, carries out the
D
Host computer w/DirectSOFT
request to read or write data, and sends
DSData Server
confirmation and/or information to the
master station.
Data Communications Module, 2nd Edition, 2/03
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Introduction
As an Extra
Communication
Port
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 limĆ
ited by the available power
budget
As a MODBUS
Network Interface
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 information 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
MODBUS Network using RTU Protocol
Network
Slave
As a slave station....
responding to network reĆ
quests
DL205 Slave
with D2–DCM
Data Communications Module, 2nd Edition, 2/03
Network
Slave
77
Introduction
Specifications
Environmental
Specifications
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
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 parity
Baud Rates
300 to 38.4K baud, switch selectable
Maximum Distance
RS232C – 49ft (15 meters)
RS422 – 3300 feet (1000 meters)
Protocol
DirectNET1
K-sequence (proprietary)
MODBUS RTU
Diagnostics
Automatic check of ROM/RAM,
communications, switch settings,
and LEDs
Operating
Specifications
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.
Cable
Switches
STEP 3. Set the D2–DCM switches.
(Baud rate, parity, etc).
Install
STEP 4. Install the D2–DCM in any slot
except for Slot 0, which is next to
the CPU.
Verify (Troubleshooting)
STEP 5. Verify correct network operation
by using the indicators and the
troubleshooting chart.
Data Communications Module, 2nd Edition, 2/03
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