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Introduction
DCM Hardware
DCM Uses
The following diagram shows the major DCM components. The address selection
switches and the communication dipswitches are of special importance.
PWR
OK
N K
ENQ
TOUT
HDR
MSTR
D T
Module Power: ON
NAK: ON if a NAK is
either sent or received
TOUT: ON if a timeout
has occurred in the DCM
Master Mode:
ON if master
OFF if slave
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.
As a network interface to a Direct NET network
As an extra general purpose communications port to connect a personal
computer or operator interface
As a network interface to a Modbus
The following pages provide an overview of these uses, along with the information
you need to connect the DCM.
Status Indicators
(shown below)
Base Connector
Online/Offline Switch
Address Selection Switch
DIP Switches for
communications
and protocol parameters
RS232C/RS422
Communication Port
Status Indicators
OK
PWR
ENQ
N K
HDR
TOUT
D T
MSTR
R
network using the RTU protocol
Self Test Indicator: ON
Send/Receive Enquiry:
FLASHING*
Send/Receive Header:
FLASHING*
Send/Receive Data
Packet: FLASHING*