Introduction - Mitsubishi MELSEC-A Series Programming Manual

1. INTRODUCTION

1. INTRODUCTION
This manual explains how to use the MELSEC-A series sequence control
instructions and microcomputer programs.
MELSEC-A series programmable controllers have a parameter which is used to
designate functions and device use ranges.
The functions and device use ranges are determined by the parameter values.
The parameters of CPU are set to default values. If the default can be used for the
purpose, it is not necessary to set the parameter.
The user's programs for the MELSEC-A series PCs are classified as follows.
ACPU Programming Manual (fundamental) gives the programs which can be used
for CPUs.
Main program
User's
program
Subprogram
Table 1.1 gives the applicable CPUs the abbreviations used in this manual.
Sequence program
Microcomputer
program
Subsequence
program
Submicrocomputer
program
1 − 1
MELSEC-A
Main routine program
Subroutine program
Interruption program
Utility program
User creating
microcomputer program
Main routine program
Subroutine program
Interruption program
User creating
microcomputer program