Rockwell-automation 1772-LP3 PLC - 2/30 Programmable Controller Progra Manual de usuario descargar pdf (Pagina 16)

Introduction

Chapter 1

16

We use the following terms to describe the various parts of your PLC-2/30

system.

Chassis — a hardware assembly used to house PC devices such as I/O

modules, adapter modules, processor modules, power supplies and some

processors (PLC-2/02, -2/16 and -2/17, for example).

I/O Group — The logical assignment of a specific input image table

word and its companion output image table word to a rack location. For

example: address 123 indicates an input module in rack 2, I/O group 3

This applies to all addressing modes.

Rack — an I/O addressing unit that corresponds to 8 input image table

words and 8 output image table words (128 input and 128 output

terminals).

Rack Fault — 1) The condition that occurs because of a loss of

communication between the processor and remote I/O chassis; 2) any

diagnostic indicator that lights up to signal a rack fault.

Slot — 1) The physical location where each module is placed within

a chassis; 2) a part of the Rack-Group-Slot addressing information for

intelligent I/O modules.

Slot Addressing — a method of assigning one input and one output image

table word to two slots, one slot, or one-half of a slot. (Appendix A is an

in-depth discussion on this topic.)

Slot Pair — two adjacent slots that can share image table words. Slot pairs

are: slots 0 and 1, 2 and 3, 4 and 5, and 6 and 7. (See Appendix A)

These and other terms are defined in Programmable Controller Terms

(publication no. PCGI–7.2).

1.4

Terms Used in This Manual

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Rockwell-automation 1772-LP3 PLC - 2/30 Programmable Controller Progra Manual de usuario Pagina 16