Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Manual de usuario descargar pdf (Pagina 180)

Quick Reference Section

Appendix A

A11

Table A.H

Program

Control Instructions

NOTE:

The MCR and ZCL boundary instructions have no word address.

The word addresses, XXX, of the immediate input and output instructions are limited to the input and output image tables

respectively.

Displayed word addresses will be 23 or 4 digits long, depending on data table size. When entering the word address, use a

leading zero if necessary.

Key Symbol Instruction Name

1770-T3

Display

Explanation and Rung Conditions

-(MCR)- Master Control Reset -(MCR)- Two MCR instructions are required to control a group of

outputs. The first MCR instruction is programmed with input

conditions to begin the zone. THe second MCR instruction is

programmed unconditionally to end the zone.

When the MCR rung is true, each rung condition controls their

output instruction.

When the first MCR rung is false, all non-retentive bits in the

zone are reset.

WARNING: Do not overlap MCR zones, or nest with ZCL

zones. Do not jump to a label in MCR zones.

-(ZCL)- Zone Control Last State -(ZCL)- Two ZCL instructions are required to control a group of

outputs. The first ZCL instruction is programmed with input

conditions to begin the zone. The second ZCL instruction is

programmed unconditionally to end the zone.

When the ZCL rung is ture, all output instructions within the

zone act according to the logic conditions preceding them.

When the first ZCL rung is false, outputs in the zone will

remain in their last state.

WARNING: Do not overlap ZCL zones, or nest with MCR

zones. Do not jump to a label in ZCL zones.

-[I]- Immediate Input XXX

[I]

Processor interrupts proram scan to update input image table

with data from the corresponding module group. It is updated

before the n ormal I/O scan and executed each program scan.

-( IOT )- Immediate Output XXX

-( IOT )-

When rung is true, the processor interupts program scan to

update a module group with data from its corresponding output

image table word address. It is updated before the normal IO

scan and executed each program scan when the rung is true.

Can be programmed unconditionally.

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