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FX Series Programmable Controlers Applied Instructions 5

5-156

5.13.1 Cautions when using Positioning Instructions

The following positioning instructions are application instructions that can be used many times

in a program.

When designing a program, make sure to follow the cautions outlined below with regard to

instruction drive timing.

FNC 156 (ZRN)

FNC 157 (PLSV)

FNC 158 (DRVI)

FNC 159 (DRVA)

• Do not drive positioning instructions which use the same output relay (Y000 or Y001) at

the same time. If such instructions are driven at the same time, they will be treated as

double coils, and not function correctly.

• Before setting a drive contact ON after is has been set to OFF be sure that the following

condition is satisfied;

One or more operation cycles of the ‘pulse output monitor (Y000:M8147, Y001:M8148)’

must occour after the positioning instruction is turned OFF, before it can be used again.

This condition must be met, as one or more OFF operations are required for the re-

driving of a positioning instruction.

If it is not met, and ‘operation error’ will occour during the instruction execution.

• Use the Step Ladder Program to correctly set up positioning instructions in conformance

to the cautions above.

Caution when using Positioning instructions with FNC 57 (PLSY) & FNC 59 (PLSR)

• Pulse output instructions FNC 57 (PLSY) & FNC 59 (PLSR) use output points Y000 and

Y001 in the same way as the positioning instructions described above.

• If a positioning and a pulse output instruction are used in the same operation, the

conflicting instructions will be treated as double coils and not function correctly.

• It is recommended to use a FNC 158 (DRVI) instruction in place of either a FNC 57

(PLSY) or FNC 59 (PLSR) instruction to avoid incorrect operation when pulse outputs

are required while positioning instructions are being used.

Output terminals Y000 and Y001 are high speed response type

Voltage range : 5 to 24V DC

Current range : 10 to 100mA

Output frequency : 100kHz or less

FX1S

2NC

Mitsubishi FX1N Series Programming Manual

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