Rockwell Automation 1785 PLC-5 User Manual download pdf (Page 6)

Preface

iii

Switchover is the transfer of I/O control from the primary processor to the

secondary processor.

Bumpless switchover is the transfer of I/O control from the primary

processor to the secondary processor where the operation of the process

being controlled is not affected.

Asynchronous processing is processing where the ladder program scan and

the block-transfer scan operate independently of each other within the same

scan time.

BTW is block-transfer write; transfer of up to 64 words from the processor to

the block-transfer module.

BTR is block transfer read; transfer of up to 64 words from the block transfer

module to the processor.

Smart Switch Interface is a remote I/O interface in the 1785-BCM module

that responds to secondary scanner poll commands with actual input values

from the remote I/O link, making the scanner think it is talking with

remote I/O.

For more information about components used with the 1785-BCM module in a

PLC-5 backup system, refer to the following publications:

Publication Title Publication Number

Enhanced and Ethernet PLC-5 Programmable Controllers

User Manual

1785-6.5.12

Classic 1785 PLC-5 Family Programmable Controllers Hardware

Installation Manual

1785-6.6.1

PLC-5 Programming Software Documentation Set 6200-N8.001

PLC-5 Programming Software: Installing and

Configuring the Software

6200-6.4.6

PLC-5 Programming Software: Programming 6200-6.4.7

PLC-5 Programming Software: Instruction Set Reference

PLC-5 Programming Software: I/O Configuration Software

6200-6.4.11

6200-6.4.12

Remote I/O Adapter Module (cat. no. 1771-ASB) Installation Data 1771-2.162

Related Publications

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Rockwell Automation 1785 PLC-5 User Manual Page 6