Hardware/Software

Chapter 4

Installation

4–7

Connecting Devices to RIO To make the series RIO connection to the MCA board, connect the

Twinaxial cable (1770–CD) to the connector for the Port configured for

RIO communications. Refer to Figure 4–3 for details. Figure 4–3 assumes

that channel A will be used for RIO communications.

ATTENTION: When breaking connections at Channel A on any MCA

Board in a series connected system, communications will be interrupted

to boards that are down line in the series. Depending on the application,

a loss of control to devices connected to these MCA boards could cause

hazardous system operation. To guard against personal injury, the

system must be shut down, or local control maintained of critical devices

connected in the series when making or breaking connections at Channel

A on any MCA Board.

IMPORTANT: Refer to the Twinaxial Cable guidelines at the back of this

chapter for details on cable type, length, etc.

Make these connections as follows:

1. Connect the signal conductor with blue insulation to the 3-pin connector

(Port A for this example) terminal 1 on the MCA board of each Drive

and the PLC Controller.

2. Connect the SHIELD drain wire to the 3-pin connector SH terminal at

both ends of each cable segment.

3. Connect the signal conductor with clear insulation to the 3-pin

connector terminal 2.

4. When the MCA board is an end device, terminate the RIO link by

connecting a terminating resistor across terminals 1 and 2 of the 3-pin

connector.

Figure

4-3. T

ypical RIO Connection

MCA Board

234 1SH 2 1SH2 1

MCA Board

2 3 4 1 SH 2 1 SH 2

CH A CH B J5 CH A CH B

MCA Board

234 1SH2 1SH2

J5 CH A CH B

Clear

Shield

Blue

RES