Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Manual de usuario descargar pdf (Pagina 66)

Advanced Instruction Set

Chapter 6

69

Figure 6.3

MCR

Programming

MCR

Start fence

When MCR zone is

false nonretentive

outputs are de-

energized

Unconditional end

fence

Function: If the start fence becomes:

True

Each rung condition controls their output instructions.

False

All non-retentive output instructions within the zone area de-energize by the

MCR zone.

NOTE: Latch/unlatch instructions should not be placed within an MCR zone,

because the MCR zone maintains retentive instructions in the last active state

when the start fence goes false.

Zone Control Logic

Symbol: -(ZCL)-

Purpose: Allows control of one or a group of outputs in more than one manner

in the same program.

Syntax: Two instructions are required (Figure 6.4):

1 2 ... 61 62 63 64 65 66 67 68 69 70 71 ... 214 215

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Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Manual de usuario Pagina 66