Automation Direct D0-DCM, Manual, Page: 13 / 70

Introduction
Installation and
Safety Guidelines
1–5
Introduction
DL05/06 Data Communications Module, 1st Edition, 08/05
Applications
The D0–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 D0–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
PC or D0–DCM
master can
communicate with
DirectNET Slaves
DirectNET Master
Issues requests to slave
stations
Using a D0–DCM as a network Master
The D0–DCM can be used with a DL05 or
DL06 CPU to serve as a network master. 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
D0–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.
Possible Slaves
S
DL05/DL06 CPU (either port)
S
DL05/DL06 CPU w/D0–DCM
S
D2–240/250–1/260 CPU (either
port)
S
D2–240/250–1/260 w/ D2–DCM
S
D3–330/330P w/ DCU
S
D3–340/350 (either port)
S
D4–430/440 (bottom port)
S
D4–450 (phone jack or bottom port)
S
Any DL405 CPU w/ D4–DCM
Using a D0–DCM as a network Slave
The D0–DCM can also be used with a
DL05 or DL06 CPU to serve as a network
slave station. In this case, the D0–DCM
“listens” to the network for any messages
that contain the D0–DCM’s address. The
D0–DCM deciphers the network
commands, carries out the request to read
or write data, and sends confirmation
and/or information to the master station.
Possible Masters
S
DL05/06 CPU (port 2)
S
DL05/06 CPU w/ D0–DCM
S
250–1/260 CPU (bottom port)
S
D2–240/250–1/260 CPU
w/ D2–DCM
S
D3–340/350 CPU (bottom
port)
S
Any DL405 CPU w/ D4–DCM
S
D4–450 CPU (bottom port)
S
Host computer w/KEPDirect
for PLCs
As a DirectNET
Interface