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Applications

As a Direct NET

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 Direct NET. This network allows you to

upload or download virtually 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

Direct NET Manual).

Using a DCM as part of a PLC Network Slave — The DCM can also be used in a

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.

esponse

Communicate with

either a PC or

Direct NET Slaves

equest

Introduction

Direct NET Slaves

Slaves respond to

the master's request

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