Mitsubishi MELSEC QCPU User Manual

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MELSEC-Q/QnA
6 BASIC INSTRUCTIONS
[Operation Errors]
(1) There are no operation errors associated with the PWM instruction.
POINT
(1) The PWM instruction registers the designated device data to the work area of the CPU
module.
The actual output operation is processed as the interruption by the CPU module.
(The device data registered to the work area of the CPU module is cleared when the
command input is turned OFF or when the CPU module is STOPped and then RUN.)
The interrupt time of individual CPU module is shown below:
CPU module Type Name Interrupt Time
High Performance model QCPU, Process CPU 1ms
QnACPU 5ms
For this reason, the PWM instruction can be used only once within all the programs being
executed by the CPU module.
(2) The instruction is not processed in the following cases:
• When both n1 and n2 are 0
• When n1 and n2 are not multiples of 5 (only when QnACPU is used)
• When n2
n1
(3) Do not change the arguments of the PWM instruction while pulses are being output by the
PWM instruction (while the command input is ON).
Before changing the arguments, turn OFF the command input.
[Program Example]
(1) The following program outputs a 100 ms pulse once each second to Y20 when X0 is ON.
[Ladder Mode] [List Mode]
Steps
Instruction
Device
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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.