Mitsubishi Electric MELSEC Q Series User manual

Basic Model QCPU(Q Mode) User's Manual (Function Explanation, Program Fundamentals)
U
User's Manual (Function Explanation, Program Fundamentals) User's Manual
Mitsubishi Programmable
Logic Controller
Specifications subject to change without notice.
MODEL
MODEL
CODE
SQCPU(Q)-U-KI-E
13JR44
SH(NA)-080188-A(0108)MEE
Basic Model QCPU(Q Mode) Basic Model QCPU(Q Mode)
(Function Explanation,
Program Fundamentals)
When exported from Japan, this manual does not require application to the
Ministry of Economy, Trade and Industry for service transaction permission.
HEAD OFFICE : 1-8-12, OFFICE TOWER Z 14F HARUMI CHUO-KU 104-6212,JAPAN
NAGOYA WORKS : 1-14 , YADA-MINAMI 5 , HIGASHI-KU, NAGOYA , JAPAN

A - 1 A - 1
•SAFETY INSTRUCTIONS •
(Always read these instructions before using this equipment.)
When using Mitsubishi equipment, thoroughly read this manual and the associated manuals introduced in
this manual. Also pay careful attention to safety and handle the module properly.
These SAFETY PRECAUTIONS classify the safety precautions into two categories: "DANGER" and
"CAUTION".
!DANGER
CAUTION
!
Indicates that incorrect handling may cause hazardous conditions,
resulting in death or severe injury.
Indicates that incorrect handling may cause hazardous conditions,
resulting in medium or slight personal injury or physical damage.
Note that the !CAUTION level may lead to a serious consequence according to the circumstances.
Always follow the instructions of both levels because they are important to personal safety.
Please save this manual to make it accessible when required and always forward it to the end user.
[Design Precautions]
!DANGER
•Install a safety circuit external to the PLC that keeps the entire system safe even when there are
problems with the external power supply or the PLC module. Otherwise, trouble could result
from erroneous output or erroneous operation.
(1) Outside the PLC, construct mechanical damage preventing interlock circuits such as
emergency stop, protective circuits, positioning upper and lower limits switches and
interlocking forward/reverse operations.
(2) When the PLC detects the following problems, it will stop calculation and turn off all output in
the case of (a). In the case of (b), it will stop calculation and hold or turn off all output
according to the parameter setting.
(a) The power supply module has over current protection equipment and over voltage
protection equipment.
(b) The PLC CPUs self-diagnostic functions, such as the watchdog timer error, detect
problems.
In addition, all output will be turned on when there are problems that the PLC CPU cannot
detect, such as in the I/O controller. Build a fail safe circuit exterior to the PLC that will make
sure the equipment operates safely at such times. Refer to " LOADING AND
INSTALLATION" in Basic Model QCPU (Q Mode) User’s Manual (Hardware Design,
Maintenance and Inspection) for example fail safe circuits.
(3) Output could be left on or off when there is trouble in the outputs module relay or transistor.
So build an external monitoring circuit that will monitor any single outputs that could cause
serious trouble.

A - 2 A - 2
[Design Precautions]
!DANGER
•When overcurrent which exceeds the rating or caused by short-circuited load flows in the output
module for a long time, it may cause smoke or fire. To prevent this, configure an external safety
circuit, such as fuse.
•Build a circuit that turns on the external power supply when the PLC main module power is
turned on. If the external power supply is turned on first, it could result in erroneous output or
erroneous operation.
•When there are communication problems with the data link, refer to the corresponding data link
manual for the operating status of each station.
Not doing so could result in erroneous output or erroneous operation.
•When connecting a peripheral device to the CPU module or connecting a personal computer or
the like to the intelligent function module to exercise control (data change) on the running PLC,
configure up an interlock circuit in the sequence program to ensure that the whole system will
always operate safely.
Also before exercising other control (program change, operating status change (status control))
on the running PLC, read the manual carefully and fully confirm safety.
Especially for the above control on the remote PLC from an external device, an immediate
action may not be taken for PLC trouble due to a data communication fault.
In addition to configuring up the interlock circuit in the sequence program, corrective and other
actions to be taken as a system for the occurrence of a data communication fault should be
predetermined between the external device and PLC CPU.
!CAUTION
•Do not bunch the control wires or communication cables with the main circuit or power wires, or
install them close to each other. They should be installed 100 mm (3.94 inch) or more from each
other.
Not doing so could result in noise that would cause erroneous operation.
•When controlling items like lamp load, heater or solenoid valve using an output module, large
current (approximately ten times greater than that present in normal circumstances) may flow
when the output is turned OFF to ON.
Take measures such as replacing the module with one having sufficient rated current.

A - 3 A - 3
[Installation Precautions]
!CAUTION
•Use the PLC in an environment that meets the general specifications contained in Basic Model
QCPU (Q Mode) User’s Manual (Hardware Design, Maintenance and Inspection). Using this
PLC in an environment outside the range of the general specifications could result in electric
shock, fire, erroneous operation, and damage to or deterioration of the product.
•Hold down the module loading lever at the module bottom, and securely insert the module fixing
hook into the fixing hole in the base module. Incorrect loading of the module can cause a
malfunction, failure or drop.
When using the PLC in the environment of much vibration, tighten the module with a screw.
Tighten the screw in the specified torque range.
Undertightening can cause a drop, short circuit or malfunction.
Overtightening can cause a drop, short circuit or malfunction due to damage to the screw or
module.
•When installing more cables, be sure that the base module and the module connectors are
installed correctly.
After installation, check them for looseness.
Poor connections could cause an input or output failure.
•Completely turn off the external power supply before loading or unloading the module.
Not doing so could result in electric shock or damage to the product.
•Do not directly touch the module's conductive parts or electronic components.
Touching the conductive parts could cause an operation failure or give damage to the module.
[Wiring Precautions]
!DANGER
•Completely turn off the external power supply when installing or placing wiring.
Not completely turning off all power could result in electric shock or damage to the product.
•When turning on the power supply or operating the module after installation or wiring work, be
sure that the module's terminal covers are correctly attached.
Not attaching the terminal cover could result in electric shock.

A - 4 A - 4
[Wiring Precautions]
!CAUTION
•Be sure to ground the FG terminals and LG terminals to the protective ground conductor. Not
doing so could result in electric shock or erroneous operation.
•When wiring in the PLC, be sure that it is done correctly by checking the product's rated voltage
and the terminal layout.
Connecting a power supply that is different from the rating or incorrectly wiring the product could
result in fire or damage.
•External connections shall be crimped or pressure welded with the specified tools, or correctly
soldered.
Imperfect connections could result in short circuit, fires, or erroneous operation.
•Tighten the terminal screws with the specified torque.
If the terminal screws are loose, it could result in short circuits, fire, or erroneous operation.
Tightening the terminal screws too far may cause damages to the screws and/or the module,
resulting in fallout, short circuits, or malfunction.
•Be sure there are no foreign substances such as sawdust or wiring debris inside the module.
Such debris could cause fires, damage, or erroneous operation.
•The module has an ingress prevention label on its top to prevent foreign matter, such as wire
offcuts, from entering the module during wiring.
Do not peel this label during wiring.
Before starting system operation, be sure to peel this label because of heat dissipation.
[Startup and Maintenance precautions]
!DANGER
•Do not touch the terminals while power is on.
Doing so could cause shock or erroneous operation.
•Correctly connect the battery. Also, do not charge, disassemble, heat, place in fire, short circuit,
or solder the battery.
Mishandling of battery can cause overheating or cracks which could result in injury and fires.
•Switch all phases of the external power supply off when cleaning the module or retightening the
terminal or module mounting screws. Not doing so could result in electric shock.
Undertightening of terminal screws can cause a short circuit or malfunction.
Overtightening of screws can cause damages to the screws and/or the module, resulting in
fallout, short circuits, or malfunction.

A - 5 A - 5
[Startup and Maintenance precautions]
!CAUTION
•The online operations conducted for the CPU module being operated, connecting the peripheral
device (especially, when changing data or operation status), shall be conducted after the
manual has been carefully read and a sufficient check of safety has been conducted.
Operation mistakes could cause damage or problems with of the module.
•Do not disassemble or modify the modules.
Doing so could cause trouble, erroneous operation, injury, or fire.
•Use a cellular phone or PHS more than 25cm (9.85 inch) away from the PLC.
Not doing so can cause a malfunction.
•Switch all phases of the external power supply off before mounting or removing the module.
If you do not switch off the external power supply, it will cause failure or malfunction of the
module.
[Disposal Precautions]
!CAUTION
•When disposing of this product, treat it as industrial waste.

A - 6 A - 6
REVISIONS The manual number is given on the bottom left of the back cover.
Print Date * Manual Number Revision
Aug., 2001 SH (NA) 080188-A First edition
Japanese Manual Version SH-080185-B
This manual confers no industrial property rights or any rights of any other kind, nor does it confer any patent
licenses. Mitsubishi Electric Corporation cannot be held responsible for any problems involving industrial property
rights which may occur as a result of using the contents noted in this manual.
2001 MITSUBISHI ELECTRIC CORPORATION

A - 7 A - 7
INTRODUCTION
Thank you for choosing the Mitsubishi MELSEC-Q Series of General Purpose Programmable Controllers.
Please read this manual carefully so that equipment is used to its optimum.
CONTENTS
SAFETY INSTRUCTIONS ...........................................................................................................................................A- 1
REVISIONS....................................................................................................................................................................A- 6
CONTENTS....................................................................................................................................................................A- 7
About Manuals............................................................................................................................................................... A-15
How to Use This Manual.............................................................................................................................................. A-16
About the Generic Terms and Abbreviations............................................................................................................. A-17
1 OVERVIEW 1- 1 to 1-10
1.1 Features...................................................................................................................................................................1- 3
1.2 Program Storage and Calculation.........................................................................................................................1- 5
1.3 Convenient Programming Devices and Instructions ..........................................................................................1- 7
2 SYSTEM CONFIGURATION FOR SINGLE CPU SYSTEM 2- 1 to 2- 7
2.1 System Configuration.............................................................................................................................................2- 1
2.1.1 Q00JCPU ..........................................................................................................................................2- 1
2.1.2 Q00/Q01CPU....................................................................................................................................2- 3
2.1.3 Configuration of GX Developer.......................................................................................................................2- 5
2.2 System Precaution.................................................................................................................................................2- 6
2.3 Confirming Serial Numbers and Function Versions............................................................................................2- 7
3 PERFORMANCE SPECIFICATION 3- 1 to 3- 3
4 SEQUENCE PROGRAM CONFIGURATION & EXECUTION CONDITIONS 4- 1 to 4-25
4.1 Sequence Program................................................................................................................................................4- 1
4.1.1 Main routine program.......................................................................................................................4- 3
4.1.2 Sub-routine programs ......................................................................................................................4- 4
4.1.3 Interrupt programs............................................................................................................................4- 5
4.2 Concept of Scan Time............................................................................................................................................4- 9
4.3 Operation Processing.............................................................................................................................................4-10
4.3.1 Initial processing...............................................................................................................................4-10
4.3.2 I/O refresh (I/O module refresh processing)....................................................................................4-11
4.3.3 Automatic refresh of the intelligent function module.......................................................................4-11
4.3.4 END processing ...............................................................................................................................4-11
4.4 RUN, STOP, PAUSE Operation Processing.......................................................................................................4-12

A - 8 A - 8
4.5 Operation Processing during Momentary Power Failure...................................................................................4-13
4.6 Data Clear Processing...........................................................................................................................................4-14
4.7 Input/Output Processing and Response Lag ......................................................................................................4-15
4.7.1 Refresh mode...................................................................................................................................4-15
4.7.2 Direct mode......................................................................................................................................4-18
4.8 Numeric Values which Can Be Used in Sequence Program............................................................................4-20
4.8.1 BIN (Binary Code)............................................................................................................................4-22
4.8.2 HEX (Hexadecimal)..........................................................................................................................4-23
4.8.3 BCD (Binary Coded Decimal)..........................................................................................................4-24
4.9 Character String Data.............................................................................................................................................4-25
5 ASSIGNMENT OF I/O NUMBERS 5- 1 to 5-19
5.1 Relationship Between the Number of Stages and Slots of the Expansion Base Unit....................................5- 1
5.1.1 Q00JCPU .........................................................................................................................................5- 1
5.1.2 Q00CPU/QO1CPU...........................................................................................................................5- 2
5.2 Installing Extension Base Units and Setting the Number of Stages.................................................................5- 3
5.3 Base Unit Assignment (Base Mode)....................................................................................................................5- 4
5.4 What are I/O Numbers?.........................................................................................................................................5- 8
5.5 Concept of I/O Number Assignment.....................................................................................................................5- 9
5.5.1 I/O numbers of main base unit and extension base unit
5.5.2 Remote station I/O number..............................................................................................................5-11
5.6 I/O Assignment by GX Developer.........................................................................................................................5-12
5.6.1 Purpose of I/O assignment by GX Developer.................................................................................5-12
5.6.2 Concept of I/O assignment using GX Developer............................................................................5-13
5.7 Examples of I/O Number Assignment..................................................................................................................5-16
5.8 Checking the I/O Numbers....................................................................................................................................5-19
6 FILES HANDLED BY BASIC MODEL QCPU 6- 1 to 6-13
6.1 About the Basic model QCPU's Memory.............................................................................................................6- 2
6.2 Program Memory....................................................................................................................................................6- 4
6.3 About the Standard ROM......................................................................................................................................6- 5
6.4 Executing Standard ROM Program (Boot Run) and Writing Program Memory to ROM...............................6- 6
6.4.1 Executing Standard ROM Program.................................................................................................6- 6
6.4.2 Write the program memory to ROM ................................................................................................6- 8
6.5 About the Standard RAM.......................................................................................................................................6- 9
6.6 Program File Configuration....................................................................................................................................6-10
6.7 GX Developer File Operation and File Handling Precautions...........................................................................6-11
6.7.1 File operation....................................................................................................................................6-11
6.7.2 File handling precautions.................................................................................................................6-12
6.7.3 File size.............................................................................................................................................6-13

A - 9 A - 9
7 FUNCTION 7- 1 to 7-48
7.1 Function List............................................................................................................................................................7- 1
7.2 Constant Scan.........................................................................................................................................................7- 2
7.3 Latch Functions.......................................................................................................................................................7- 5
7.4 Setting the Output (Y) Status when Changing from STOP Status to RUN Status.........................................7- 7
7.5 Clock Function ........................................................................................................................................................7- 9
7.6 Remote Operation..................................................................................................................................................7-12
7.6.1 Remote RUN/STOP.........................................................................................................................7-12
7.6.2 Remote PAUSE................................................................................................................................7-15
7.6.3 Remote RESET................................................................................................................................7-17
7.6.4 Remote Latch Clear.........................................................................................................................7-19
7.6.5 Relationship of the remote operation and Basic model QCPU RUN/STOP switch.......................7-20
7.7 Selection of Input Response Time of the Q Series-Compatible Input Module and Interrupt Module (I/O
Response Time).....................................................................................................................................................7-21
7.7.1 Selection of input response time of the input module ......................................................................7-21
7.7.2 Selection of input response time of the high-speed input module..................................................7-22
7.7.3 Selection of input response time of the interrupt module................................................................7-23
7.8 Setting the Switches of the Intelligent-Function Module.....................................................................................7-24
7.9 Writing Data in the Ladder Mode during the RUN Status..................................................................................7-25
7.10 Multiple-user monitoring function........................................................................................................................7-27
7.11 Watchdog Timer (WDT) ......................................................................................................................................7-28
7.12 Self-Diagnosis Function.......................................................................................................................................7-30
7.12.1 LED display when error occurs......................................................................................................7-33
7.12.2 Cancel error....................................................................................................................................7-33
7.13 Failure History.......................................................................................................................................................7-34
7.14 System Protect......................................................................................................................................................7-35
7.14.1 Password registration.....................................................................................................................7-35
7.15 GX Developer system monitor............................................................................................................................7-37
7.16 LED Display...........................................................................................................................................................7-39
7.17 Serial Communication Function (Usable with the Q00CPU or Q01CPU).....................................................7-41
8 COMMUNICATION WITH INTELLIGENT FUNCTION MODULE 8- 1 to 8- 6
8.1 Communication Between Basic model QCPU and Q-series Intelligent Function Modules............................8- 1
8.2 Initial setting and automatic refresh setting using GX Configurator..................................................................8- 2
8.3 Communication using the intelligent function module device............................................................................8- 4
8.4 Communication using the instructions dedicated for intelligent function modules..........................................8- 5
8.5 Communication using FROM/TO instruction.......................................................................................................8- 6
9. PARAMETER LIST 9- 1 to 9- 8