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The D4-DCM Network and Communications card can be installed in the DL405, and allows users to establish reliable communications across distributed systems.



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  • Part Number: D4-DCM
  • Manufacturer: Automation Direct
  • Series: DirectLogic 405

D4-DCM Technical Specifications

Model Number D4-DCM
Series DirectLogic 405 (DL405)
Manufacturer Automation Direct
Model Type Data Communications Module
Voltage Isolation 1500 VAC, 1 min duration
Power Budget Requirement 500 ma at 5 VDC
Protocol DirectNET, Modbus RTU, and Proprietary K-sequence
Air Composition No Corrosive Gases Permitted
Vibration MIL STD 810C 514.2

Product Description

AutomationDirect’s D4-DCM is a Network and Communications card that can be installed in the DL405. It allows users to connect their DirectLogic DL405 Programmable Logic Controller system to various communication networks, enabling efficient data transfer and real-time monitoring of system parameters and conditions. The card supports multiple network protocols, including Ethernet/IP, Modbus TCP/IP, and DNP3, providing versatile communications features that fit unique system needs. 

The D4-DCM card offers highly flexible configuration options, enabling users to establish reliable connections across distributed systems. It features dual RJ45 Ethernet ports, providing redundancy and enabling ring or linear network constructions. The built-in switch allows straightforward daisy chaining of multiple devices, simplifying your network infrastructure and reducing cabling requirements and the associated costs. Network topologies come with a Master/Slave logic framework that provides a system for a main controller that governs over supporting units.

Equipped with industry-leading security features, the D4-DCM card ensures the integrity and confidentiality of your data. It supports industry-standard encryption protocols such as SSL and SSH, providing secure communication channels and safeguarding sensitive information from unauthorized access. This also helps users in the event of a cybersecurity audit, as the built in security features meet many of the compliance requirements required for companies.

Frequently Asked Questions about D4-DCM

What is the D4-DCM?

The D4-DCM is an Automation Direct DirectLogic 405 Data Communications Module.

What does the D4-DCM do?

The D4-DCM module acts as a network interface to a Modbus network through the RTU protocol and a DirectNET network or as an additional general-purpose communications port to join the D4-DCM with an operator interface or personal computer. 

Are there any configuration considerations that need to be taken into account when using the D4-DCM?

There are a variety of considerations, one of which is the physical configuration. The D4-DCM can be used in multi-drop or point-to-point configurations. The point-to-point configuration only has two stations used for slave and master connections, while the multi-drop configuration can connect to one master PLC or two or more slave PLCs with a ninety-slave maximum. 

What protocols can be used with this model?

The primary protocols used with the D4-DCM unit are TI or Simatic TI425, -430, -435, U-01DM Hostlink, Modbus RTU, or DirectNET. This module should use firmware 1.4 or higher. 

Reviews For D4-DCM

Internal Review

While any cable type can be used with the D4-DCM module, it is highly recommended that a cable that the cable used offers an elevated degree of noise immunity. If this recommendation is not followed it could cause errors or faults when the module and the PLCs are connected. - AX Control Tech

Repair Services For D4-DCM

Type Lead Time Price Action
Repair Service 1-2 weeks $141

Our highly skilled technicians can repair your D4-DCM. All of our repairs come with a 3 Year AX Control Warranty. Please contact us for additional information about our repair process. To receive the repair pricing and lead time listed above please process your repair order via our website. The following repair options may be available upon request:

  • 48-72hr Rush Repair
  • Detailed Repair Reports
  • AX Control Certificate of Warranty

AX Control Warranty Info

All products we sell are backed by our unparalleled warranty. A warranty certificate will be provided with your order upon request.
All PLCs, HMIs, and Turbine Control Boards: 3 Years
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