Mitsubishi MELSEC A1S63P User Manual

Master control instructions
Master control set, reset
(MC, MCR)
100 ms, 10 ms
timers
Time value is set to
0
Device number to be turned ON
Nesting number (NO
to N7)
-r + Device
100 ms retentive OUT instruction SETIRST
timer and counter and SFT
Remains at present
All turn OFF Status is
value held
MC
The MC instruction is used
to allow the sequence program to perform efficient circuit
switching by opening and closing the common bus circuits. MC is the master control
start instruction, when the ON/OFF command for the MC is ON, operation results from
MC to MCR remain unchanged. Scanning between the MC and MCR instructions is
executed even when the ONlOFF command for the MC instruction is OFF. Scan time
does not therefore become shorter. When the ON/OFF command for the MC
instruction is OFF, the operation result
of MC to MCR is as indicated below
The MC instruction can use the same nesting N number repeatedly by changing the
specified device number. When the MC instruction is ON, the coil of the specified
device is turned ON. If a device is used twice for the OUT instruction,
it is treated as a
duplicated coil. To avoid this, do not use the specified device in other instructions.
MCR
The MCR instruction is a master control reset, and indicates the end of a master control
range.
Do not use a contact instruction before the MCR instruction
The MC instructions can be used by nesting. The range of each MC instruction is
identified by a nesting number. Nesting numbers are used in the range of
NO to N7.
Using nesting, circuits which sequentially restrict execution conditions of a program can
be made.
An example of a program which uses the nesting of MC instructions is shown on the
following page.
116

Mitsubishi MELSEC A1S63P Specifications

General

Brand	Mitsubishi
Model	MELSEC A1S63P
Category	Controller
Language	English

Summary

Overview of the A1S PLC

What is the AIS PLC?

Introduces the Mitsubishi AIS programmable logic controller's purpose and capabilities.

How the AIS PLC Works

Explains the sequential control program execution and update methods of the AIS PLC.

AIS Module Descriptions

Central Processing Unit (CPU) Module

Describes the main component of the AIS PLC system, its functions, and specifications.

CPU Base Units

Details the different CPU base unit models, their slot capacities, and dimensions.

Extension Base Units

Explains the purpose and models of extension base units for expanding system capacity.

Power Supply Modules

Describes the power supply modules essential for providing power to the PLC system.

Input Modules Overview

Output Modules Overview

Special Function Modules

System Selection and Configuration

AIS System Selection Process

Outlines the five steps for selecting an AIS PLC system to match application needs.

Input Module Selection Guide

Provides a flowchart for selecting appropriate input modules based on specifications.

Output Module Selection Guide

Provides a flowchart for selecting appropriate output modules based on specifications.

Special Function Module Selection Guide

Guides the selection of special function modules for specific applications.

Power Supply Module Selection Guide

Details the process for selecting the correct power supply module for the system.

Base Unit Selection Guide

Explains how to select the appropriate base unit based on the number of I/O slots required.

Installation

AIS PLC Installation Environment Guidelines

Base Unit Mounting Instructions

Mounting Base Units on DIN Rail

Installing and Removing AIS Modules

Wiring

Power Supply Module Wiring Instructions

Wiring of I/O Equipment

Grounding Procedures

Programming