Mitsubishi Electric FX3G SERIES Programming Manual page 482

Programmable controllers

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Table of Contents

Series Programmable Controllers

Programming Manual - Basic & Applied Instruction Edition

1. When using two or more PID instructions

Two or more PID instructions can be executed at the same time. (There is no limitation in the number of loops.)

However, make sure that

2. Number of devices occupied for parameters starting from

In the limit cycle method

- Twenty-nine devices are occupied from the head device specified in

In the step response method

- Operation setting (ACT): When bits 1, 2 and 5 are not all "0"

Twenty-five devices are occupied from the head device specified in

- Operation setting (ACT): When bits 1, 2 and 5 are all "0"

Twenty devices are occupied from the head device specified in

3. When specifying a device in the latched area backed up against power failure

For the output value (MV) in the PID instruction, specify a data register (D) outside the latched area.

Program example

When specifying a data register in the latched area, make sure to clear the latched (backed up) contents when the

PLC mode is set to RUN using the following program.

Program example

Initial pulse

When an operation error occurs, the special auxiliary relay M8067 turns ON, and the error code is stored in the special

data register D8067.

and other operands specified in each instruction are different to each other.

Data register number in the latched area specified in

16 External FX Device – FNC 80 to FNC 89

16.9 FNC 88 – PID / PID Control Loop

→ For the error code, refer to Section 38.4.

Fx3u series Fx3uc series