Automation Direct D0–DCM User Manual

D0–DCM Data

Communications

Module

Manual Number D0–DCM–M

WARNING

Thank you for purchasing automation equipment from Automationdirect.com™, doing business as,
AutomationDirect. We want your new DirectLOGIC™ automation equipment to operate safely. Anyone who installs
or uses this equipment should read this publication (and any other relevant publications) before installing or operating
the equipment.

To minimize the risk of potential safety problems, you should follow all applicable local and national codes that regulate
the installation and operation of your equipment. These codes vary from area to area and usually change with time. It is
your responsibility to determine which codes should be followed, and to verify that the equipment, installation, and
operation are in compliance with the latest revision of these codes.

At a minimum, you should follow all applicable sections of the National Fire Code, National Electrical Code, and the
codes of the National Electrical Manufacturer’s Association (NEMA). There may be local regulatory or government
offices that can also help determine which codes and standards are necessary for safe installation and operation.

Equipment damage or serious injury to personnel can result from the failure to follow all applicable codes and
standards. We do not guarantee the products described in this publication are suitable for your particular application,
nor do we assume any responsibility for your product design, installation, or operation.

Our products are not fault–tolerant and are not designed, manufactured or intended for use or resale as on–line control
equipment in hazardous environments requiring fail–safe performance, such as in the operation of nuclear facilities,
aircraft navigation or communication systems, air traffic control, direct life support machines, or weapons systems, in
which the failure of the product could lead directly to death, personal injury, or severe physical or environmental
damage (”High Risk Activities”). AutomationDirect specifically disclaims any expressed or implied warranty of fitness
for High Risk Activities.

For additional warranty and safety information, see the Terms and Conditions section of our Desk Reference. If you
have any questions concerning the installation or operation of this equipment, or if you need additional information,
please call us at 770–844–4200.

This publication is based on information that was available at the time it was printed. At AutomationDirect we
constantly strive to improve our products and services, so we reserve the right to make changes to the products and/or
publications at any time without notice and without any obligation. This publication may also discuss features that may
not be available in certain revisions of the product.

Trademarks

This publication may contain references to products produced and/or offered by other companies. The product and
company names may be trademarked and are the sole property of their respective owners. AutomationDirect
disclaims any proprietary interest in the marks and names of others.

Copyright 2005, Automationdirect.com™ Incorporated

All Rights Reserved

No part of this manual shall be copied, reproduced, or transmitted in any way without the prior, written consent of
Automationdirect.com™ Incorporated. AutomationDirect retains the exclusive rights to all information included in
this document.

AVERTISSEMENT

Nous vous remercions d’avoir acheté l’équipement d’automatisation de Automationdirect.comE, en faisant des affaires
comme, AutomationDirect. Nous tenons à ce que votre nouvel équipement d’automatisation DirectLOGIC™ fonctionne
en toute sécurité. Toute personne qui installe ou utilise cet équipement doit lire la présente publication (et toutes les autres
publications pertinentes) avant de l’installer ou de l’utiliser.

Afin de réduire au minimum le risque d’éventuels problèmes de sécurité, vous devez respecter tous les codes locaux et
nationaux applicables régissant l’installation et le fonctionnement de votre équipement. Ces codes diffèrent d’une région à
l’autre et, habituellement, évoluent au fil du temps. Il vous incombe de déterminer les codes à respecter et de vous assurer
que l’équipement, l’installation et le fonctionnement sont conformes aux exigences de la version la plus récente de ces
codes.

Vous devez, à tout le moins, respecter toutes les sections applicables du Code national de prévention des incendies, du
Code national de l’électricité et des codes de la National Electrical Manufacturer’s Association (NEMA). Des organismes de
réglementation ou des services gouvernementaux locaux peuvent également vous aider à déterminer les codes ainsi que
les normes à respecter pour assurer une installation et un fonctionnement sûrs.

L’omission de respecter la totalité des codes et des normes applicables peut entraîner des dommages à l’équipement ou
causer de graves blessures au personnel. Nous ne garantissons pas que les produits décrits dans cette publication
conviennent à votre application particulière et nous n’assumons aucune responsabilité à l’égard de la conception, de
l’installation ou du fonctionnement de votre produit.

Nos produits ne sont pas insensibles aux défaillances et ne sont ni conçus ni fabriqués pour l’utilisation ou la revente en tant
qu’équipement de commande en ligne dans des environnements dangereux nécessitant une sécurité absolue, par
exemple, l’exploitation d’installations nucléaires, les systèmes de navigation aérienne ou de communication, le contrôle de
la circulation aérienne, les équipements de survie ou les systèmes d’armes, pour lesquels la défaillance du produit peut
provoquer la mort, des blessures corporelles ou de graves dommages matériels ou environnementaux (”activités à risque
élevé”). La société AutomationDirect nie toute garantie expresse ou implicite d’aptitude à l’emploi en ce qui a trait aux
activités à risque élevé.

Pour des renseignements additionnels touchant la garantie et la sécurité, veuillez consulter la section Modalités et
conditions de notre documentation. Si vous avez des questions au sujet de l’installation ou du fonctionnement de cet
équipement, ou encore si vous avez besoin de renseignements supplémentaires, n’hésitez pas à nous téléphoner au
770–844–4200.

Cette publication s’appuie sur l’information qui était disponible au moment de l’impression. À la société AutomationDirect,
nous nous efforçons constamment d’améliorer nos produits et services. C’est pourquoi nous nous réservons le droit
d’apporter des modifications aux produits ou aux publications en tout temps, sans préavis ni quelque obligation que ce soit.
La présente publication peut aussi porter sur des caractéristiques susceptibles de ne pas être offertes dans certaines
versions révisées du produit.

Marques de commerce

La présente publication peut contenir des références à des produits fabriqués ou offerts par d’autres entreprises. Les
désignations des produits et des entreprises peuvent être des marques de commerce et appartiennent exclusivement à
leurs propriétaires respectifs. AutomationDirectE nie tout intérêt dans les autres marques et désignations.

Copyright 2005, Automationdirect.comE Incorporated

Tous droits réservés

Nulle partie de ce manuel ne doit être copiée, reproduite ou transmise de quelque façon que ce soit sans le consentement
préalable écrit de la société Automationdirect.comE Incorporated. AutomationDirect conserve les droits exclusifs à
l’égard de tous les renseignements contenus dans le présent document.

1

Manual Revisions

If you contact us in reference to this manual, please remember to include the revision number.

Title: DL05/06 Data Communications Module
Manual Number: D0–DCM–M

Issue Date Description of Changes

Original 8/05 Original Issue

1

Table of Contents

Chapter 1: Introduction

Manual Overview 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

The Purpose of this Manual 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Supplemental Manuals 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Who Should Read this Manual 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Technical Support 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Conventions Used 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Key Topics for Each Chapter 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

D0–DCM Hardware Features 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Applications 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

As a DirectNET Interface 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

As an Extra Communication Port 1–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

As a MODBUS RTU

Chapter 2: Installation, Network Cabling and Module
Specifications

Inserting the D0–DCM into the PLC 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

D0–DCM Module Installation 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Building the Communication Cable 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Consideration 1: Physical Configuration 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Consideration 2: Electrical Specification RS232 or RS422/485 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . .

Consideration 3: Cable Schematics 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Consideration 4: Cable Specifications 2–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Consideration 5: Installation Guidelines 2–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Wiring Diagrams 2–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

D0–DCM Port 1 RS–232 Network 2–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

D0–DCM Port 2 RS–232 Network 2–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

D0–DCM Port 2 RS–485 Network 2–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

D0–DCM Port 2 RS–422 Network 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Module Specifications 2–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

General Specifications 2–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Port 1 Specifications 2–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Port 2 Specifications 2–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Status Indicators 2–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

r

Network Interface 1–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter 3: D0–DCM Module Configuration Registers

DCM Port Configuration Registers 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Module Configuration Registers 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Comm Port Default Configuration Parameters 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A: Port 1 – Transmit Mode, Protocol 3–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

B: Port 1 – Station Address, Baud Rate, Parity 3–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

C: Port 2 – RTS On/Off delay, Transmit Mode, Protocol, Comm Time–out, RS–485 Mode 3–6. . . .

D: Port 2 – Station Address, Baud Rate, Data Bit, Stop Bit, Parity 3–8. . . . . . . . . . . . . . . . . . . . . . . .

E: Port 2 – Character Time–out 3–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

F: Port 1 and 2 Setup and Completion Code 3–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

G: Port 1 and 2 Reset Time–out 3–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ii

Table of Contents

DL05 Port Setup Examples 3–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Port 1 Example: Slave Mode Only 3–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Port 2 Example: Slave Mode 3–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Port 2 Example: DirectNet Master 3–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Port 2 Example: MODBUS RTU Master 3–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DL06 Port Setup Examples 3–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Port 1 Example: Slave Mode Only 3–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Port 2 Example:Slave Mode 3–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Port 2 Example: DirectNet Master 3–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Port 2 Example: MODBUS RTU Master 3–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter 4: RLL Programming for Communications

PLC-to-PLC Communications 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

How RLL is Used for Communications 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Network Instructions 4–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Read (RX) and Write (WX) Instructions 4–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Building the Read (RX) or Write (WX) Routine 4–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

The Second LD Instruction 4–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

The LDA Instruction 4–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Read (RX) Instruction 4–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Write (WX) Instruction 4–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Addressing the Different Memory Types 4–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Bit Memory 4–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Word Memory and Aliases 4–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DL05 CPU 4–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DirectSOFT32 is Flexible 4–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DL06 CPU 4–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Special Relays for Communications 4–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Program with One Read Instruction 4–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Program for the Master PLC 4–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Program for the Slave PLC 4–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Program for the Master PLC 4–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Program for the Slave PLC 4–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Example Program with One Write Instruction 4–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Program for the Master PLC 4–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Program for the Slave PLC 4–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Program for the Master PLC 4–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Program for the Slave PLC 4–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Integrating Multiple Read and Write Instructions 4–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Interlocking Relays 4–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

First RX/WX Instruction 4–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Second RX/WX Instruction 4–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Third RX/WX Instruction 4–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Returning to the First RX/WX Instruction 4–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Shift Register 4–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Store If Equal 4–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

First RX/WX Instruction 4–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Second RX/WX Instruction 4–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Third RX/WX Instruction 4–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents

Chapter 5: D0–DCM Using MODBUSr RTU

Network Slave Operation 5–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MODBUS Function Codes Supported 5–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Determining the MODBUS Address 5–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

If Your Host Software or Master Requires the Data Type and Address 5–3. . . . . . . . . . . . . . . . . . . . .

Example 1: V2100 5–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Example 2: Y20 5–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Example 3: T10 Current Value 5–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Example 4: C54 5–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

If the Host Software or Master Requires an Address ONLY 5–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Example 1: V2100 5–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Example 2: Y20 5–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Example 3: C54 5–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Network Master Operation 5–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MODBUS Function Codes Supported 5–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PLC Memory Supported for Master Operation 5–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Example 1: Calculating Word PLC Address 5–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Example 2: Calculating Discrete Input PLC Address 5–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Building the Read (RX) or Write (WX) Routine 5–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Step 1: Identify DCM Slot Location and Slave 5–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Step 2: Load Number of Bytes to Transfer 5–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Step 3: Specify Master Memory Area 5–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Step 4: Specify Slave Memory Area 5–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Communications from a Ladder Program 5–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Multiple Read and Write Interlocks 5–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

iii

Introduction

In This Chapter. . . .

— Manual Overview
— D0–DCM Hardware Features
— D0–DCM Applications

1

1

1–2

Introduction

Manual Overview

The Purpose of
this Manual

Introduction

Supplemental
Manuals

This manual is designed to allow you to setup
and install your DL05/06 Data
Communications Module (D0–DCM). This is
the only manual you will need if you are using
the D0–DCM as an extra general purpose
communication port for your DL05/06 PLC
system. If you plan on using the D0–DCM as a
network master or slave for a
DirectNET/MODBUS RTU network, this
manual covers the basic steps for setting up
the D0–DCM and the RX/WX instructions
needed in your RLL program.

If you plan on using a PC 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.

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

• DirectNET Network Guide part number DA–DNET–M

• DirectSoft32 Programming Software part number PC–DSOFT32–M

Who Should Read
this Manual

Installation and

Safety Guidelines

Technical Support

If you plan to use your D0–DCM to communicate with another PLC, you will need the
appropriate user manual for the other PLC.

If you plan to use your D0–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.

If you need an additional communications port for your DL05/06 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 D0–DCM module.

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

DL05/06 Data Communications Module, 1st Edition, 08/05

Conventions Used

1–3

Introduction

Key Topics for
Each Chapter

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.

The beginning of each chapter will list the
key topics that can be found in that
chapter.

1

Introduction Installation and

DL05/06 Data Communications Module, 1st Edition, 08/05

Safety Guidelines

1–4

D0–DCM Hardware Features

Introduction

Introduction

The following diagram shows the D0–DCM hardware components. The
communication parameters are configured using DirectSOFT32. There are no DIP
switches to set on this module.

The D0–DCM requires ladder logic programming to configure its communication
parameters, unless the default settings are acceptable for the application. If the
D0–DCM is to be used as a network master, you must use ladder logic code to
configure this parameter.

D0–DCM

Port 1: RS–232
Communication Port

Status Indicators
(shown below)

Installation and

Safety Guidelines

Port 2:

RS232/422/485

Communication Port

Status Indicators

TX1: Port 1
Transmitting Data
(Green)

RX1: Port 1
Receiving Data (Green);
Error (Red)

TX1

RX1
ERR

DATA COMM

PORT2

TX2

RX2

ERR

TX2: Port 2
Transmitting data
(Green)

RX2: Port 2
Receiving Data (Green);
Error (Red)

The D0–DCM Data Communications Module is a general purpose communications
interface that c an b e u sed i n a D L05/06 P LC s ystem. T he m odule c an g o in any o ption
slot. This module is primarily used for several reasons:

• As an extra general purpose communications port to connect to a personal
computer or operator interface

• As a network master or slave interface to a DirectNET network (port 2);
port 1 functions as a DirectNET slave only

• As a network master or slave interface to a MODBUS
port 1 functions as a MODBUS

R

RTU slave only

R

RTU network (port 2);

• As a K–sequence slave (both ports)

DL05/06 Data Communications Module, 1st Edition, 08/05

Applications

As a DirectNET
Interface

1–5

Introduction

Introduction Installation and

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 Master

Issues requests to slave

stations

PC or D0–DCM

master can

communicate with

DirectNET Slaves

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 W X) inside o f your R LL
program to initiate the data exchange. The
D0–DCM takes communication requests
issued by the PLC program i nstructions and
automatically converts these requests into
network commands that read data from or
write data to another network station.

DirectNET Slaves

Slaves respond to the master’s request

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

Safety Guidelines

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.

DL05/06 Data Communications Module, 1st Edition, 08/05

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

1–6

Introduction

As an Extra
Communication
Port

Introduction

As a MODBUSRTU
Network Interface

The D0–DCM ports are similiar to the ports on the DL05 and DL06 CPUs. In general,
if you can connect a device to the CPU ports, then you can also connect the same
device to the D0–DCM. These devices can be a variety of things, such as operator
interfaces or personal computers.

Quickly add extra

communication ports*

* Number of option modules is
limited by the DL06 available
power budget.

The D0–DCM can be used as a master or slave interface to connect your DL05/06
system to a M ODBUS RTU network. P ort 1 c an o nly s erve a s a MODBUS R TU s lave.
Port 2 can serve a s a M ODBUS R TU master o r slave. This m anual 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.

Installation and

Safety Guidelines

DL05/06 Data Communications Module, 1st Edition, 08/05

For information about the MODBUS protocol see the Group Schneider Web site at:
www.schneiderautomation.com. At the main menu, select Support/Services,
Modbus, Modbus Technical Manuals, PI–MBUS–300 Modbus Protocol Reference
Guide or search for PIMBUS300.

MODBUS® Master

MODBUS Network using RTU Protocol

Network

Slave

DL06 Slave with

D0–DCM

As a slave station....

responding to network reĆ
quests

Network

Slave

Installation, Network
Cabling and Module
Specifications

In This Chapter. . . .

— Inserting the D0–DCM into the PLC
— Building the Communication Cable
— Wiring Diagrams
— Module Specifications

1

2

2–2

Installation and Setup

Inserting the D0–DCM into the PLC

D0–DCM Module
Installation

and Setup

Installation

Remove the front protective option slot cover by squeezing the pinch tabs and lifting
the cover off. Remove the top option slot cover using small flat–head screwdriver or
similiar device. Be sure PLC power is off when installing the D0–DCM module.

DL05
Front View

Pinch Tabs to
remove front
slot cover

0V

C0 C2 Y16Y14Y13Y11Y6Y4Y3Y1

C1 C3Y0 Y15Y12Y10 Y17Y7Y5Y2

2.0AOUTPUT: 6–240V

N.C.

40VA50–60HzPWR: 100–240V

D0–06DR

PWR
RUN
CPU
TX1
RX1
TX2
RX2

LGG

)

AC(N)24V

AC(L

50 – 60Hz2.0A,6 – 27V

Y

0 1 2 3 4 5 6 7 10 11 12 13 14 15 16 17 20 21 22 23

X

INPUT: 12 – 24V3 – 15mA

DL06
Front View

C0 C4C2X1 X3 X4 X6 X11X13X14 X16 X21 X23N.C.

C1 C3X2 X5 X7 X10 X12 X15X17 X20 X22X0 N.C.

PORT1 RUN STOP

PORT2

TERM

Remove top
slot cover with
small flat–head
screwdriver

Installation and

Safety Guidelines

DL06
Top View

Insert the module into the open slot in the DL05 or into any one of the four slots in the
DL06. Locate the module so the printed information is oriented in the same direction
as the markings on the PLC. Be careful to align the female connector on the printed
circuit board of the module with the male connector on the PLC mother board. Press
the module into the slot until the front of the module is flush with the front of the PLC.
Check the DL06 power budget to be sure that it remains within the power supply
limits before installing more modules.

NOTE: The DL05 CPU’s communication feature for the D0–DCM requires
DirectSOFT32 Version 3.0c (or later) and firmware version 5.00 (or later). The DL06
requires DirectSOFT32 version V4.0, build 16 (or later) and firmware version 1.90 (or
later). See our website for more information: www.automationdirect.com.

DL05/06 Data Communications Module, 1st Edition, 08/05

Installation and Setup

Building the Communication Cable

There are several considerations that help determine the type of cable needed for
your D0–DCM application. The next few pages discuss these considerations in
detail.

Consideration 1:
Physical
Configuration

The D0–DCM can be used in either a point-to-point or multi-drop configuration. A
point-to-point connection only has two stations, a master and a slave. Use the
point-to-point configuration to connect a personal computer, an operator interface,
or an intelligent device to a single D0–DCM. You must also use this configuration
when you want to connect a DirectNET master station to a single DirectNET slave
station.
Use the multi-drop configuration to connect one master to two or more slaves (90
slave maximum).

Point to Point – RS–232C

PC or OI

Master

2–3

Installation

and Setup

D0–DCM Slave

DL06 Master

Multi-drop – RS–422/485

DirectNET or

MODBUS

RTU

Masters

or

or

DL05 Slave

DirectNET Slaves

Safety Guidelines

Installation and

D0–DCM

Data Communications Module, 1st Edition, 08/05

2–4

Installation and Setup

Consideration 2:
Electrical
Specification
RS232C or
RS422/485

Consideration 3:
Cable Schematics

and Setup

Installation

Port 1

6
5

4
3
2
1

The D0–DCM can support RS–232 (ports 1 and 2) or RS–422/485 (port 2)
communication. Your application and configuration choice will help determine which
electrical specification is best for you. If you are using multi-drop, you must use RS–422
or RS–485. If you are using point-to-point, you may have a choice between RS–232C
and RS–422/485.
You can use RS–232 if the cable length is less than 50 feet and if the cable will not be
subjected to induced electrical noise that is commonly found near welders, large motors,
or other devices that create large magnetic fields.
You must use RS–422/485 for all other applications. RS–422/485 allows longer cable
distances (up to 3300 feet) and provides higher noise immunity.

Although the network configuration and electrical specification are important, the type of
devices being connected to the D0–DCM are just as important. The exact cable
schematic needed really depends on a combination of all three things.
The following diagram shows the port pinouts for the D0–DCM.

D0–DCM Pinouts

Port 2

15

5

10

Port 1 Pin Descriptions

10V
25V
3 RXD Receive Data (RS–232)
4 TXD Transmit Data (RS–232)
5 RTS Request to Send
60V

Installation and

Safety Guidelines

RJ12 Phone Jack

Connector

11

6

1

15-pin Female
HD Connector

Port 2 Pin Descriptions

1 5V 5 VDC
2 TXD2 Transmit Data (RS–232)
3 RXD2 Receive Data (RS–232)
4 RTS2 Ready to Send (RS–232C
5 CTS2 Clear to Send (RS–232)
6 RXD2– Receive Data – (RS–422/485)
7 0V Logic Ground
8 0V Logic Ground
9 TXD2+ Transmit Data + (RS–422/485)

10 TXD2 – Transmit Data – (RS–422/485)

11 RTS2 + Request to Send + (RS–422/485)
12 RTS2 – Request to Send – (RS–422/485
13 RXD2 + Receive Data + (RS–422/485)
14 CTS2 + Clear to Send + (RS422/485)
15 CTS2 – Clear to Send – (RS–422/485)

DL05/06 Data Communications Module, 1st Edition, 08/05

Installation and Setup

2–5

Consideration 4:
Cable Specifications

Consideration 5:
Installation
Guidelines

Although many types of cables may work for your application, we recommend you
use a cable that is constructed to offer a high degree of noise immunity . The following
specifications are to be used as a guideline.

Structure Shielded, twisted-pair. . . . . . . . . . . . . . . . . . . . . . .

(RS232 only uses two wires and a ground)

Conductor size 24 AWG or larger. . . . . . . . . . . . . . . . . .

Insulation Polyethylene. . . . . . . . . . . . . . . . . . . . . . .

Shield Copper braid or aluminum foil. . . . . . . . . . . . . . . . . . . . . . . . . .

Impedance 100W @ 1MHz. . . . . . . . . . . . . . . . . . . . . .

Capacitance 60pf / meter or less. . . . . . . . . . . . . . . . . . . .

Y our company may have guidelines for cable installation. If so, you must check those
before you begin the installation. Here are some general things to consider.

• Don’t run cable next to larger motors, high current switches, or
transformers. This may cause noise problems.

• Route the cable through an approved cable housing to minimize the risk
of accidental cable damage. Check local and national codes to choose
the correct method for your application.

• Consider redundant cabling if the application data is critical. This allows
you to quickly reconnect all stations while the primary cable is being
repaired.

Installation

and Setup

Cable Shield Grounding — It is important to ground the cable shield to minimize
the possibility of noise. The preferred method is to connect one end of the cable
shield to the connector housing. If noise problems are still present and you have a
good earth ground for the cabinet, you must connect one end of the shield to the
cabinet earth ground. Don’t ground both ends of the shield because this will create
induced noise on the cable.

Step 1: Strip back about 2.5” of the shield.

2.5”

Step 2: Crimp a ring connector onto the shield.

Step 3: Secure the shield to
the connector shell.

Safety Guidelines

Installation and

Data Communications Module, 1st Edition, 08/05

2–6

Installation and Setup

Wiring Diagrams

D0–DCM Port 1
RS–232 Network

Modular Connector

and Setup

Installation

123456

6-pin Female

TXD

RXD

0V

D0–DCM Port 2
RS–485 Network

TXD+ / RXD+

TXD 4
RXD 3

0V 1

Termination
Resistor

D0–DCM
PORT 1

D0–DCM Port 2
RS–232 Network

TXD+ / RXD+

15

OR
Loop
Back

5

CTS

10

RTS

4

RXD

3

TXD

2

7

11

Signal GND

1

6

RTS

RTS

CTS

TXD
RXD

GND

TXD+ / RXD+

CTS–

CTS+

Installation and

Safety Guidelines

RTS–

RTS+

15

RXD+

11

10

TXD+

7

TXD– / RXD–

Signal GND

Connect shield

5

TXD–

0V

1

RXD–

6

to signal ground

Cable: Use Belden
9841 or equivalent

CTS–

CTS+

RTS–

RTS+

TXD– / RXD–

15

10

TXD+

RXD+

7

11

6

5

TXD–

0V

1

RXD–

TXD– / RXD–

Signal GND

DL05/06 Data Communications Module, 1st Edition, 08/05

D0–DCM Port 2
RS–422 Network

Installation and Setup

RXD+
RXD–
TXD+
TXD–
Signal GND

PC/PLC Master

Cable: Use Belden
9729 or equivalent

9 TXD+
10 TXD–
13 RXD+
6 RXD–
11 RTS+

12 RTS–
14 CTS+

15 CTS–
70V

Termination
Resistor on
last slave only

PORT 2

(D0–DCM)

RS–422 Slave

RS–422/485 Multi-drop Termination Resistors — It is important you add

termination resistors at each end of the RS422/485 line. This helps reduce data
errors during data transmission. You must select resistors that match the cable
impedance. For example, a typical 22 AWG solid conductor cable with 4.5 twists per
foot has a typical impedance of about 120 ohm.
There are two ways to actually connect the resistors.

• Line-to-Line — this method balances the receive data lines (IN+ and
IN–) and requires one resistor at each end of the line. (The cable
diagrams we’ve provided show this method, but you can use either).

• Line-to-Ground — this method also balances the receive data lines, but
common mode noise rejection is improved significantly. This method
requires two resistors at each end of the line. Also, since there are two
resistors, the sum total of both resistors must match the cable
impedance.

2–7

Installation

and Setup

Data Communications Module, 1st Edition, 08/05

Safety Guidelines

Installation and