User Manual

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Table Of Contents

1756-UM532A-EN-P
Important User Information
Table of Contents
Purpose of This Manual
Preface
- Who Should Use This Manual
- Other Resources
1756-DH485 Module Overview
- Introduction
- What the Module Does
- Module Requirements
- Module Features
- Prevent Electrostatic Discharge
- Removal and Insertion Under Power
- Typical Applications
- Remote Messaging
  - Remote Upload and Download
- Routing Limitations
  - DH-485 and CIP Messaging
  - Alphanumeric Indicators
Overview of the DH-485 Network
- Introduction
- DH-485 Network Description
- DH-485 Network Protocol
- DH-485 Token Rotation
- DH-485 Network Initialization
- Devices that Use the DH-485 Network
- 1747-AIC Isolated Link Coupler for DH-485
- 1761-NET-AIC Advanced Interface Converter Product Overview
- Operating Modes
- Device Compatibility
  - Node Address Identification
- Misconception about the 1761-NET-AIC Converter
- 1747-UIC USB to DH-485 Interface Converter
- Example System Configuration
  - Configure the SLC 5/03, SLC 5/04, and SLC 5/05 Controller Channel 0 for DH-485
- Important Planning Considerations
  - Hardware Considerations
  - Software Considerations
- Additional Resources
Use Data Highway 485 Network
- Introduction
- What Is Data Highway 485?
  - Link Design
- Two Methods of Communication Over a DH-485 Network
- Use DH-485 Messaging
- Configuration Information in DH-485 Messaging
- Application Timeout
- Example DH-485 Network Routing Configuration
- Use the Common Industrial Protocol (CIP) Messaging
Use RSLinx Software to Create a Routing Table
- Introduction
- Choose the Correct Software
- Use RSLinx Software to Create a Routing Table
  - What Is a Routing Table?
  - ControlLogix Routing
- Create the Routing Table
  - Set the Controller Slot
Communicate from an SLC 5/03 Controller to a Logix Controller over a DH-485 Network
- Introduction
- Hardware Configuration
- Use the Controller Slot to Route the Local Message
- Create a Local Message in RSLogix 500
- Configure the Message
- Create a Logic Map for the Local Message in RSLogix 5000 Software
Communicate Between SLC Controllers over DH+ and DH485 Networks
- Introduction
- SLC 5/04 Controller Sends a Remote Message
- SLC 5/03 Controller Sends a Remote Message
Communicate Between a PLC-5 Controller and a Remote SLC 5/03 Controller over Multiple DH-485 Networks
- Introduction
- Hardware Configuration
- Create the Routing Table
  - Configure the PLC-5 DH+ Channel 1A Link ID
- Create a Message in RSLogix 5
- Configure the Message
Communicate from an SLC 5/05 Controller to an SLC 5/03 Controller over an EtherNet/IP Network
- Introduction
- Hardware Configuration
- Create a Message in RSLogix 500
- Configure the Message
- Review the Multihop Feature in RSLogix 500
Communicate to a SLC 5/03 Controller on a DH-485 Network
- Introduction
- Hardware Configuration
- Create a Message in RSLogix 5000
- Configure the Message
Communicate from a Logix Controller to an SLC 5/03 Controller over EtherNet/IP and DH-485 Networks
- Introduction
- Hardware Configuration
- Create a Remote 1756-ENBT Message in RSLogix 5000
- Configure the Message
Specifications
Troubleshoot the 1756-DH485 Module
- Introduction
- Check Power Supply and Module Status
- Interpret the LED Status Indicators
- Interpret the Alphanumeric Indicators
- Interpret the OK Status Indicator
- Routing Errors in DH-485 Messaging
  - Routing Errors in Local DH-485 Messaging
  - Routing Errors in Remote DH-485 Messaging
Index
- Numerics
- A
- C
- D
- E
- F
- H
- L
- M
- N
- P
- R
- S
- T
- U
  - Installation Assistance
  - New Product Satisfaction Return
How Are We Doing?
Rockwell Automation Support
Backcover

Publication 1756-UM532A-EN-P - May 2006

2-12 Overview of the DH-485 Network

Software Considerations

Software considerations include the configuration of the network and the

parameters that can be set to the specific requirements of the network. The

following are major configuration factors that have a significant effect on

network performance:

• Number of nodes on the network

• Addresses of those nodes

• Baud rate

• Maximum node address selection

• SLC 5/03, SLC 5/04, and SLC 5/05 controllers only: token hold factor

• Maximum number of communicating devices

The following sections explain network considerations and describe ways to

select parameters for optimum network performance (speed).

Number of Nodes

The number of nodes on the network directly affects the data transfer time

between nodes. Unnecessary nodes (such as a second programming terminal

that is not being used) slow the data transfer rate. The maximum number of

nodes on the network is 32.

Set Node Addresses

The best network performance occurs when node addresses start at 0 and are

assigned in sequential order. Controllers cannot be node 0. Also, initiators such

as personal computers should be assigned the lowest numbered addresses to

minimize the time required to initialize the network.

Set Controller Baud Rate

The best network performance occurs at the highest baud rate. All devices

must be at the same baud rate.