Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Manual de usuario descargar pdf (Pagina 67)

Advanced Instruction Set

Chapter 6

610

Program the first ZCL instruction with input conditions to begin the zone

(start fence).

Program the second ZCL instruction unconditionally to end the zone (end

fence).

Do not nest ZCL zones with other ZCL or MCR zones.

Each zone must be separate and complete.

Figure 6.4

ZCL

Programming

ZCL

MCR

Start fence

When ZCL zone is

false all outputs

remain in their

last state

Unconditional end

fence

Function: When the rung becomes:

True

All output instructions within the zone act according to the logic conditions

preceding them.

False

All output instructions within the zone remain in their last state; regardless of

the I/O rack last state switch setting or changes in logic on the input side of

the rung. These same outputs may now be controlled by another zone

program. Only one zone may control a set of outputs at one time.

Purpose: Interrupts the program scan to update I/O data before the normal I/O

update sequence.

Immediate Update I/O

Instructions

1 2 ... 62 63 64 65 66 67 68 69 70 71 72 ... 214 215

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Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Manual de usuario Pagina 67