Rockwell Automation 1785-KA5PB User Manual

Data Highway Plus/DH485 Communication Adapter Module

(Cat. No. 1785KA5/B, KA5P/B)

User Manual

Important User Information

Because of the variety of uses for the products described in this
publication, those responsible for the application and use of this control
equipment must satisfy themselves that all necessary steps have been taken
to assure that each application and use meets all performance and safety
requirements, including any applicable laws, regulations, codes and
standards.

The illustrations, charts, sample programs and layout examples shown in
this guide are intended solely for example. Since there are many variables
and requirements associated with any particular installation, Allen-Bradley
does not assume responsibility or liability (to include intellectual property
liability) for actual use based upon the examples shown in this publication.

Allen-Bradley publication SGI–1.1, “Safety Guidelines For The
Application, Installation and Maintenance of Solid State Control”
(available from your local Allen-Bradley office) describes some important
differences between solid-state equipment and electromechanical devices
which should be taken into consideration when applying products such as
those described in this publication.

Reproduction of the contents of this copyrighted publication, in whole or
in part, without written permission of Allen–Bradley Company, Inc. is
prohibited.

Throughout this manual we make notes to alert you to possible injury to
people or damage to equipment under specific circumstances.

ATTENTION: Identifies information about practices or
circumstances that can lead to personal injury or death, property
damage or economic loss.

Attention helps you:

- Identify a hazard

- Avoid the hazard

- recognize the consequences

Important: Identifies information that is critical for successful application
and understanding of the product.

Important: We recommend you frequently backup your application
programs on appropriate storage medium to avoid possible data loss.

 1995 AllenBradley Company, Inc.

IBM

is a registered trademark of International Business Machines Corporation

PLC, PLC2, PLC3 and PLC5 are registered trademarks of AllenBradley Co. Inc.

DH+,

DHII,

PLC5/10, PLC5/12, PLC5/15, PLC5/25, PLC5/30, PLC5/40, PLC5/60, PLC5/250, SLC, SLC 5/01, SLC 5/02, SLC 5/03

and

SLC 500 are trademarks of AllenBradley Co., Inc.

Summary of Changes

Summary of Changes

Summary of Changes

This publication contains new information not included in the last release.

New Information

European Union Directive Compliance

Information on the European Union Directive is located on pages 2-1
and A-1.

Auto Routing Feature

Detailed information on using the Auto Routing Feature is located on
pages 2-4 and 2-5.

Power Supply Requirements

Detailed information on power supply requirements for the European
Union Directive is located on page 2-13.

Change Bars

The areas in this manual which are different from the previous edition are
marked with change bars (as shown to the right of this paragraph) to
indicate the addition of new or revised information.

P-1

Table of Contents

Using this Manual

Purpose
Who Should Read this Manual
Frequently Used Terms
Related
Updated

of this Manual

Publications

Information

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Summary of Changes P1. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Overview of the 1785KA5

Communication Adapter Module 11. . . . . . . . . . . . . . . .

What this Chapter Contains 11. . . . . . . . . . . . . . . . . . . . . . . . . . . .

What is the 1785KA5 Communication Adapter Module? 11
DH+ and DH485 Networks 12
The DH485 Network 14
Compatible Products 15

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . .

Installing the 1785KA5

Communication Adapter Module 21. . . . . . . . . . . . . . . .

What this Chapter Contains 21. . . . . . . . . . . . . . . . . . . . . . . . . . . .

European Union Directive Compliance 21

the Switches

Setting
Mounting the 1785KA5 Communication Adapter Module

in an I/O Rack
Panelmounting the 1785KA5 Communication Adapter Module 29
Connecting the 1785KA5 Module 210
Powering Up the 1785KA5 Module 216

. . . . . . . . . . . . . . . . . . .

22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . .

. . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . .

ii
ii

i

i
i
i

Communicating through the 1785KA5

Communication Adapter Module 31. . . . . . . . . . . . . . . .

What this Chapter Contains 31. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Internet Protocol Addressing 31
1785KA5 Router Communication 34
1785KA5
PLC5
Controlling

Gateway Communication

to SLC Communication

the Flow of Data

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . .

36. . . . . . . . . . . . . . . . . . . . . .

38. . . . . . . . . . . . . . . . . . . . . . . . . . .

317. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Specifications A1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using this Manual

Preface

Purpose

of this Manual

Who Should Read this
Manual

Frequently Used Terms

This manual describes the 1785-KA5 Data Highway Plus/DH485
communication adapter module. It contains information for:

installing and troubleshooting the module
using the module

We assume that you are already familiar with:

Allen-Bradley PLC and SLC processors
Allen-Bradley DH485 and Data Highway Plus

In this manual, we use the following terms:

This term Means

1785KA5 module,
or 1785KA5

DH+ Data Highway Plus

DH485 DH485 Data Highway

link a physical network

PLC programmable logic controller

SLC small logic controller

station (or node) the interface point at which devices, such as programmable

1785KA5 Data Highway Plus/DH485 communication adapter module

controllers, connect to the network. Usually the station is an interface
module, except for the PLC5
directly to the Data Highway Plus

 and T50 terminal, which connect

i

Preface

Using this Manual

Related

Publications

Updated Information

These Allen-Bradley publications contain related information:

Publicaton Publication Number

SLC 500 Overview brochure 17461.1

Bulletin 1746/47 SLC 500 Modular Hardware Style
Programmable Controllers I/O manual

Hand Held Terminal user's manual 1747809

Programming Terminals (Cat. Nos. 1784T45, T47, T50)
product data

DH+ LAN product data 17852.6

PLC5 Family Processor product data 17852.1

DH/DH+/DH485 Protocol and Command Set reference
manual

1747804

17842.1

17706.5.16

Also see the Advanced Programming Software (APS) user’s manual
(Cat. No. 1747-NM002 Series A.)

Since the last release of this manual, some information has changed. We
call your attention to the new information with a black revision bar in the
margin as shown here.

ii

Chapter

1

Overview of the 1785KA5
Communication Adapter Module

What this Chapter Contains

What is the 1785KA5
Communication Adapter
Module?

Read this chapter for information on:

what the 1785-KA5 communication adapter module is
what DH+ and DH485 networks are
compatible products

The 1785-KA5 communication adapter module lets devices on the Data
Highway Plus (DH+) network communicate with devices on the RS-485
Data Highway (DH485) network for:

uploading/downloading of SLC 500 programs from a DH+ device

message communication between DH+ PLC processors and DH485

SLC 500 processors

The 1785-KA5 communication adapter module features:

concurrent operation as a gateway or router:

- in gateway mode, DH+ devices must initiate messages; DH485
devices cannot initiate messages

- in router mode, both DH+ and DH485 devices that implement
internet protocol (IP) can initiate messages (SLC 5/01, SLC 5/02,
and fixed controllers do not support IP)

support for existing IP

compatibility with other Allen-Bradley DH+ hardware and software

products

a baud rate of 57.6 Kbps on the DH+ network and 300bps-19.2 Kbps on

the DH485 network

1-1

Chapter 1

Overview of the 1785KA5
Communication Adapter Module

DH+ and DH485 Networks

This section describes the DH+ and DH485 networks. For more
information on these networks, see the DH/DH+/DH485 Protocol and
Command Set reference manual (publication 1770-6.5.16).

DH+ Networks

DH+ is a baseband local area network (LAN) that allows peer-to-peer
communication among a maximum of 64 nodes. Each node has a unique
station address between 0–63 decimal and 0–77 octal. Use DH+ when you
want to connect a small number of nodes on a common link or with other
industrial networks as a part of a plant-wide CIM facility. DH+ features:

remote programming of PLC-2, PLC-3, and PLC-5 processors on your

network (using Allen-Bradley 6200 Series software)

direct connections to PLC-5 processors and industrial programming

terminals

easy reconfiguration and expansion if you want to add more nodes later

a communication rate of 57,600 bits per second

The DH+ implements peer-to-peer communication with a token-passing
scheme to rotate link mastership among its nodes. Since this method does
not require polling, it helps provide time-efficient reliable data transport.
The DH+ uses factory set timeouts to restart token-passing communication
if the token is lost because of a defective node.

1-2

Chapter 1

Overview of the 1785KA5
Communication Adapter Module

The 1785-KA5 communication adapter module is available in two
versions:

Use this version If your application is

1771 I/O rack mount
(Cat. No. 1785-KA5/B)

standalone panel mount
(Cat. No. 1785KA5P/A)

primarily DH+ with multiple 1771 I/O racks and SLC 500
subnetworks within close proximity

primarily a SLC (DH485) environment with no 1771 I/O racks in
close proximity

Figure 1.1 shows the module’s hardware features:

Figure 1.1
1785KA5

module

Status LEDs

DH+ connection
(3-pin Phoenix
connector)

DH+ remote
programming port
(9pin)

Dshell

programming
connection (8pin
modular connector)

DH485 connection
(6 - pin

Phoenix

connector)

1785-KA5/B I/O rack mount

External power (+ 5Vdc) connector
(4 -pin Phoenix connector)

1785-KA5P/B panel mount

19190

1-3

Chapter 1

Overview of the 1785KA5
Communication Adapter Module

The DH485 Network

This section describes the DH485 network. For more information on this
network, see the DH/DH+/DH485 Protocol and Command Set reference
manual (publication 1770-6.5.16).

DH485 is a low cost, peer-to-peer programming and data acquisition link
for a variety of Allen-Bradley products, such as the SLC 500 family of
programmable controllers. A DH485 network provides a networking
solution for smaller applications (up to 32 nodes) within a small radius.
Each node has a unique station address between 0–31 decimal. The
maximum cable length is 4,000 feet. The DH485 link has a maximum
communication rate of 19,200 bits per second.

A DH485 network has a topology that is similar to that of a DH or DH+
network. DH485 is based on the EIA Standard RS-485 Electrical
Signalling Specification and implements token-passing protocol with
rotating mastership. The link protocol delimits messages, detects and
signals errors, retries after errors and controls message flow.

A variety of Allen-Bradley products, such as the SLC 500 family of
controllers, the SLC 500 APS programming software, the 1784-KTX,

-KTXD and -KR modules, and the 1770-KF3 module act as token-passing
masters on the DH485 network. The DH485 protocol also supports slave
(respond-only) mode for low-level devices on the network.

The 1784-KTX, -KTXD and -KR modules provide an IBM PC backplane
link to the DH485. It provides an asynchronous link to connect devices on
the network. An asynchronous device can interface with a DH485 module
directly or through a modem link.

1-4

Chapter 1

Overview of the 1785KA5
Communication Adapter Module

Compatible Products

You can use the following Allen-Bradley products with the 1785-KA5
module:

This product Has this Cat. No.

DH+ PLC2 Communication Module 1785KA3

Processor Communication Interface Module
(for IBM PC/XT/AT)

Processor Communication Interface Module
(for IBM PS/2)

Communication Interface Module for the 1784T47
Programming Terminal

I/O ScannerCommunication Adapter Module 1775S5

DH+ PLC3 Communication Module 1775S5, SR5

SLC 500 Hand Held terminal 1747PT1 (with 1747PTA1E

Portable Programming Terminal 1784T45, T47

Advanced Programming Software 1747PA2E (series x and up)

Standard Driver Software 6001F1E, F1E2

6001NET (for VAX) Network Communication Software 6001A1D, G1D, A1DB, G1DB

1784KT

1784KT2

1784KL

firmware)

The following Allen-Bradley PLC and SLC processors are compatible with
the 1785-KA5 module:

PLC-5/10
PLC-5/12
PLC-5/15
PLC-5/25
PLC-5/30
PLC-5/250
PLC-5/40
PLC-5/60
SLC 5/03
SLC 5/04
SLC 500 (can only reply to remote messages)
SLC 5/01 (can only reply to remote messages)
SLC 5/02 (can only reply to remote messages)

1-5

Chapter

2

Installing the 1785KA5
Communication Adapter Module

What this Chapter Contains

European Union Directive Compliance

This chapter explains how to install the 1785-KA5 module in a 1771 I/O
rack or in a stand-alone panel mount setup. It contains the following
sections:

the European Union Directive Compliance
setting the switches
installing the 1785-KA5 module in an I/O rack
installing the 1785-KA5 panel-mount version
connecting the module
powering up

If this product is installed within the European Union or EEA regions and
has the CE mark, the following regulations apply.

EMC Directive

This apparatus is tested to meet Council Directive 89/336/EEC
Electromagnetic Compatibility (EMC) using a technical construction file
and the following standards, in whole or in part:

EN 50081-2 EMC – Generic Emission Standard, Part 2 – Industrial

Environment

EN 50082-2 EMC – Generic Immunity Standard, Part 2 – Industrial

Environment

The product described in this manual is intended for use in an industrial
environment.

Low Voltage Directive

This apparatus is also designed to meet Council Directive 73/23/EEC
Low Voltage, by applying the safety requirements of EN 61131–2
Programmable Controllers, Part 2 – Equipment Requirements and Tests.

For specific information that the above norm requires, see the appropriate
sections in this manual, as well as the following Allen-Bradley publications:

Industrial Automation Wiring and Grounding Guidelines, publication

1770-4.1

Guidelines for Handling Lithium Batteries, publication AG-5.4
Automation Systems Catalog, publication B111

2-1

Chapter 2

Installing the 1785KA5
Communication Adapter Module

Setting the Switches

The 1785-KA5 module has three banks of DIP switches that let you select
various communication options. The switch assemblies and their
corresponding options are:

To set the Use switch assembly

DH485 station address and baud rate SW1

DH+ station address and the auto route enable option SW2

DH485 and DH+ channel LINK_IDs SW3

Figure 2.1 shows the location of the switches on the 1785-KA5 module.

Figure 2.1
1785KA5
1785KA5/B shown)

DH485 BAUD RA

communication adapter module switch assemblies (cat. no.

TE

LEGEND

DH485 STATION ADDRESS

B0
B1
B2
B3
B4

ON
OFF

SW - 1 SW - 2

switch assemblies

Important: The 1785-KA5 uses the following convention:

on = binary 1
off = binary 0

SW - 3

B7

RESERVED

B6

AUTO ROUTE ENABLE

B5
B4
B3

DH+ STA

B2
B1
B0

B3
B2
B1
B0

B3
B2
B1
B0

TION ADDRESS

DH485 CHANNEL DH+ IP LINK ID

DH+ CHANNEL LINK ID

19191

OFF

ON

(0)

(1)

2-2

Chapter 2

Installing the 1785KA5
Communication Adapter Module

SW1: DH485 Station Address and DH485 Baud Rate

Use switch assembly SW-1 to select the DH485 station address and baud
rate for the 1785-KA5 module. The following sections show you how.

Setting the DH485 Station Address

Set switches 1-5 of SW-1 to the DH485 station address for the 1785-KA5.
Valid addresses are 0-31 decimal or 0-37 octal. Set the switches as
follows:

Most significant octal digit (switches 12)

To set to Set switch 1 to Set switch 2 to

0 0 0

1 0 1

2 1 0

3 1 1

Least significant octal digit (switches 35)

To set to Set switch 3 to Set switch 4 to Set switch 5 to

0 0 0 0

1 0 0 1

2 0 1 0

3 0 1 1

4 1 0 0

5 1 0 1

6 1 1 0

7 1 1 1

For example

To set the module’s DH485 station address to 15 decimal or 17 octal, set
the SW-1 switches as follows:

Set switch To

1 0

2 1

3 1

4 1

5 1

most significant octal digit = 1

least significant octal digit = 7

2-3

Chapter 2

Installing the 1785KA5
Communication Adapter Module

Setting the DH485 Baud Rate

Set switches 6-8 of SW-1 to the DH485 baud rate as follows:

To set this baud rate Set switch 6 to Set switch 7 to Set switch 8 to

300 0 0 0

600 0 0 1

1200 0 1 0

2400 0 1 1

4800 1 0 0

9600 1 0 1

19200 1 1 0

RESERVED 1 1 1

SW2: Auto Routing and DH+ Station Address

The module has an auto routing feature that broadcasts an information
packet over the Data Highway network every 30 seconds.

The following illustration shows the only two network configurations
that you must use auto routing with:

PLC5 PLC5

Data Highway Plus

1785KA51785KA5

DH+

PLC5

PLC5

Desired

Communication

DH+

DH485

2-4

SLC5/03

Desired

Communication

SLC5/03

DH485

1785KA5

1785KA5

DH485