Rockwell-automation 1775-MX_S4A,D17756.3.1 User Manual PLC-3 BACKUP CO Manual de usuario descargar pdf (Pagina 38)

Installing a Backup System

Chapter 2

2-23

Terminators

The first and last physical device of each I/O channel requires a terminator.

Use discrete terminators (cat. no. 1770-XT) for 1775-S4A, -SR scanner

modules. The 1775-S5, -SR5 scanner modules have internal terminators

that can be enabled/disabled with a switch. See Figure 2.17 and Figure 2.7.

Figure 2.17

Selecting

erminators on 1775S5, SR5 Scanner Modules

1234

Switch Positions:

UP =

Switch is away from board

DOWN =

Switch is toward board

When DOWN, a terminator is connected on the corre



sponding communication channel.

Connect a terminator when the scanner is physically

the first or last device on a Data Highway

, Data High



way Plus, I/O, peertopeer

, or backup communica



tions link; otherwise, set the switch to the UP position.

OFF

10979I

Important: When using internal terminators, removing the terminal

swing arm from a module causes the communication channels to be

unterminated.

For more information about terminators and I/O channel wiring, refer to

the PLC-3 Programmable Controller Installation and Operation Manual

(publication 1775-6.7.1).

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Rockwell-automation 1775-MX_S4A,D17756.3.1 User Manual PLC-3 BACKUP CO Manual de usuario Pagina 38