Rockwell-automation 1766-Lxxxx MicroLogix 1400 Programmable Controller User Manual download pdf (Page 229)

Rockwell Automation Publication 1766-UM001H-EN-P - May 2014 189

Connecting to Networks via RS-232/RS-485 Interface Appendix E

Important DH-485 Network Planning Considerations

Carefully plan your network configuration before installing any hardware. Some

of the factors that can affect system performance are:

• amount of electrical noise, temperature, and humidity in the network

environment.

• number of devices on the network.

• connection and grounding quality in installation.

• amount of communication traffic on the network.

• type of process being controlled.

• network configuration.

The major hardware and software issues you need to resolve before installing a

network are discussed in the following sections.

Hardware Considerations

You need to decide the length of the communication cable, where you route it,

and how to protect it from the environment where it will be installed.

When the communication cable is installed, you need to know how many devices

are to be connected during installation and how many devices will be added in the

future. The following sections help you understand and plan the network.

Number of Devices and Length of Communication Cable

The maximum length of the communication cable is 1219 m (4000 ft). This is

the total cable distance from the first node to the last node in a segment.

However, two segments can be used to extend the DH-485 network to 2438 m

1746-BAS BASIC Module SLC Chassis Provides an interface for SLC 500 devices to foreign devices. Program in

BASIC to interface the 3 channels (2 RS232 and 1 DH-485) to printers,

modems, or the DH-485 network for data collection.

1746-UM004

1746-PM001

1746-RM001

2760-RB Flexible Interface

Module

(1771) PLC Chassis Provides an interface for SLC 500 (using protocol cartridge 2760-SFC3) to

other A-B PLCs and devices. Three configurable channels are available to

interface with Bar Code, Vision, RF, Dataliner™, and PLC systems.

1747-6.12

2760-ND001

1784-PKTX,

-PKTXD

PC DH-485 IM PCI Computer Bus Provides DH-485 using RSLinx. 1784-6.5.22

1784-PCMK PCMCIA IM PCMCIA slot in

computer

Provides DH-485 using RSLinx. 1784-UM519

2711-K5A2,

-B5A2, -K5A5,

-B5A5, -K5A1,

-B5A1, -K9A2,

-T9A2, -K9A5,

-T9A5, -K9A1,

and -T9A1

PanelView 550

and PanelView

900 Operator

Terminals

Panel Mount Provides electronic operator interface for SLC 500 processors. 2711-UM014

Devices that Support DH-45 Network

Catalog

Number

Description Installation Function Publication

1 2 ... 224 225 226 227 228 229 230 231 232 233 234 ... 405 406

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