Mitsubishi MELSEC QCPU User Manual

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MELSEC-Q/QnA
3 CONFIGURATION OF INSTRUCTIONS
3.2.5 Using character string data
Character string data is character data used by basic instructions and application instructions.
It encompasses all data from the designated character to the NULL code (00
H
).
(1) When designated character is the NULL code.
One word is used to store the NULL code.
NULL code (00
H
) designation
M0
$MOV D0
Character string data transfer
D0 NULL
" "
(2) When character string is even
Uses (number of characters/2 + 1) words, and stores character string and NULL code.
For example, if "ABCD" is transferred to D0, the character string ABCD is stored at D0 and D1,
and the NULL code is stored at D2.
Designation of an even number
character string
M0
$MOV "ABCD"
D0
D0
Character string data transfer
42
H
44
H
41
H
43
H
NULL
D1
D2
(3) When number of characters is odd
Uses (number of characters/2) words (rounds up decimal fractions) and stores the character
string and NULL code.
For example, if "ABCDE" is transferred to D0, the character string (ABCDE) and the NULL
code are stored from D0 to D2.
Designation of an odd number
character string
M0
$MOV
"ABCDE"
D0
D0
Character string data transfer
42
H
44
H
41
H
43
H
NULL
D1
D2
45
H
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Mitsubishi MELSEC QCPU Specifications

General

Model	MELSEC QCPU
Series	Q Series
Category	Controller
Memory	Varies depending on CPU type
Program Memory	Varies depending on CPU type (e.g., 32K steps to 260K steps or more)
Data Memory	Varies depending on CPU type (e.g., 64K words to 512K words)
I/O Capacity	Up to 4096 points (varies by model)
Number of I/O Points	Up to 4096 points
Communication	Ethernet
Programming Language	Ladder Logic, Instruction List, SFC, ST, Function Block Diagram
Program Capacity	Varies depending on CPU type (e.g., 32K steps to 260K steps or more)
Power Supply	24V DC or 100-240V AC (depending on model)
Operating Temperature	0°C to 55°C
Storage Temperature	-25°C to 75°C
Humidity	5 to 95% RH, non-condensing
Shock Resistance	147 m/s2, 3 times in X, Y, and Z directions

Summary

SAFETY PRECAUTIONS

REVISIONS

GENERAL DESCRIPTION

Related Programming Manuals

Lists other relevant programming manuals.

Abbreviation and Generic Name

Explains abbreviations and generic names used.

INSTRUCTION TABLES

Types of Instructions

Categorizes the types of CPU module instructions.

How to Read Instruction Tables

Explains the format and conventions of instruction tables.

Sequence Instructions

Instructions for relay control ladders.

Basic Instructions

Common operations like comparison and arithmetic.

Application Instructions

Instructions for specific applications like logical operations.

Instructions for Data Link

Instructions for data communication between stations.

QCPU Instructions

Instructions specific to QCPU modules.

Redundant System Instructions (For Q4ARCPU)

Instructions for redundant system configuration.

CONFIGURATION OF INSTRUCTIONS

Configuration of Instructions

Explains the structure of CPU module instructions.

Designating Data

Describes how to designate data types for instructions.

Index Modification

Explains how to use index registers for indirect addressing.

Indirect Designation

Explains how to use indirect addressing for devices.

Subset Processing

Explains subset processing for performance improvement.

Cautions on Programming (Operation Errors)

Describes programming cautions and potential operation errors.

Conditions for Execution of Instructions

Explains different execution conditions for instructions.

Counting Step Number

Explains how step numbers are calculated for instructions.

Operation when OUT, SET/RST, or PLS/PLF Instructions Use the Same Device

Explains behavior when multiple instructions use the same device.

HOW TO READ INSTRUCTIONS

How to Read Instructions

Explains how to read instruction descriptions.

SEQUENCE INSTRUCTIONS

Contact Instructions

Instructions for operation start and connections.

Connection Instructions

Instructions for connecting ladder blocks.

Operation results push, read, pop (MPS, MRD, MPP)

Instructions for managing operation results.

Timers (OUT T, OUTH T)

Instructions for low and high speed timers.

Counters (OUT C)

Instructions for up/down counters.

Setting devices (except for annunciators) (SET)

Instruction to set devices ON.

Resetting devices (except for annunciators) (RST)

Instruction to reset devices OFF.

Leading edge and trailing edge output (PLS, PLF)

Instructions for pulse output on leading/trailing edges.

Shift Instruction

Instructions for shifting bit devices.

Master Control Instructions

Instructions for master control of program execution.

Termination Instructions

Instructions to terminate program execution.

Other Instructions

Miscellaneous instructions.

BASIC INSTRUCTIONS

Comparison Operation Instruction

Instructions for comparing data.

Arithmetic Operation Instructions

Instructions for addition, subtraction, multiplication, division.

Data Conversion Instructions

Instructions for converting data formats.

Data Transfer Instructions

Instructions for moving data.

Program Execution Control Instructions

Instructions to control program execution flow.

Other Convenient Instructions

Various useful instructions.

APPENDICES

APPENDIX1 OPERATION PROCESSING TIME

Details processing times for various CPU modules.

APPENDIX 2 COMPARISON OF PERFORMANCE BETWEEN CPUs

Compares performance across different CPU types.

APPENDIX 3 SPECIAL RELAY LIST

Lists and explains special relays.

APPENDIX 4 SPECIAL REGISTER LIST

Lists and explains special registers.

APPENDIX 5 APPLICATION PROGRAM EXAMPLES

Provides examples of application programs.