Instruction Manual

Chapter 2 - Installation

2-1

CHAPTER 2 - INSTALLATION

Remote I/O Board Cable

Termination Dip Switch

Configuration

About Cable

Termination

Weight controllers are connected to a cable in daisy-chain fashion and

are referred to as “nodes”. A Daisy Chain is a hardware configuration

in which devices are connected one to another in a series. The end

nodes on the daisy chain require termination resistors. The Remote I/O

board provides the S1 Dip Switches which are used for cable termina-

tion based on the baud rate. (See Table 2-1) The S1 Dip Switches are

only used on the last device in the daisy chain. For all other devices on

the daisy chain both dip switches should be set to OFF. (See Fig. 2)

NOTE: Refer to your Allen-Bradley PLC-2, PLC-3, PLC-5 and SLC 500 manuals for the

maximum number of nodes available.

Setting the Cable

Termination Dip

Switches

Step 1. For all RIO board options (except for the last device) make

sure the dip switches are set to the OFF position. (See Fig. 2-

FIG. 2-1 REMOTE I/O S1 DIP SWITCH SETTINGS (DEFAULT)

NOTE: The factory default setting is for both switches to be turned OFF. Also note that the

dip switches in Figure 2-1 have been rotated for illustration purposes.

BAUD TERMINATION

MAX

NODES

MAX

LENGTH

SWITCH 1 SWITCH 2

57.6 K 150 Ohms 16 10,000 Feet ON OFF

115.2 K 150 Ohms 16 5,000 Feet ON OFF

230.4 K 82 Ohms 32 2,500 Feet OFF ON

TABLE 2-1: CABLE TERMINATION REQUIREMENTS

ON OFF