LSIS XGK-CPUU User manual

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Programmable Logic Controller
XGK CPU Module
User’s Manual
z Read this manual carefully before
installing, wiring, operating, servicing
or inspecting this equipment.
zKeep this manual within easy reach
for quick reference.
XGK-CPUU
XGK-CPUH
XGK-CPU
A
XGK-CPUS
XGK-CPUE
XGT Series
http://eng.lsis.biz

Safety Instruction
Before using the product …
For your safety and effective operation, please read the safety instructions
thoroughly before using the product.
► Safety Instructions should always be observed in order to prevent accident
or risk with the safe and proper use the product.
► Instructions are separated into “Warning” and “Caution”, and the meaning of
the terms is as follows;
This symbol indicates the possibility of serious injury
or death if some applicable instruction is violated
This symbol indicates the possibility of slight injury
or damage to products if some applicable instruction
is violated
► The marks displayed on the product and in the user’s manual have the
following meanings.
Be careful! Danger may be expected.
Be careful! Electric shock may occur.
► The user’s manual even after read shall be kept available and accessible to
any user of the product.
Warning
Caution

Safety Instruction
Safety Instructions when designing
 Please, install protection circuit on the exterior of PLC to protect
the whole control system from any error in external power or PLC
module. Any abnormal output or operation may cause serious problem
in safety of the whole system.
- Install applicable protection unit on the exterior of PLC to protect
the system from physical damage such as emergent stop switch,
protection circuit, the upper/lowest limit switch, forward/reverse
operation interlock circuit, etc.
- If any system error (watch-dog timer error, module installation error,
etc.) is detected during CPU operation in PLC, the whole output is
designed to be turned off and stopped for system safety. However,
in case CPU error if caused on output device itself such as relay or
TR can not be detected, the output may be kept on, which may
cause serious problems. Thus, you are recommended to install an
addition circuit to monitor the output status.
 Never connect the overload than rated to the output module nor
allow the output circuit to have a short circuit, which may cause a
fire.
Never let the external power of the output circuit be designed to
be On earlier than PLC power, which may cause abnormal output or
operation.
 In case of data exchange between computer or other external
equipment and PLC through communication or any operation of
PLC (e.g. operation mode change), please install interlock in the
sequence program to protect the system from any error. If not, it
may cause abnormal output or operation.
Warning

Safety Instruction
Safety Instructions when designing
Safety Instructions when designing
 I/O signal or communication line shall be wired at least 100mm
away from a high-voltage cable or power line. If not, it may cause
abnormal output or operation.
Caution
 Use PLC only in the environment specified in PLC manual or
general standard of data sheet. If not, electric shock, fire, abnormal
operation of the product or flames may be caused.
Before installing the module, be sure PLC power is off. If not,
electric shock or damage on the product may be caused.
 Be sure that each module of PLC is correctly secured. If the
product is installed loosely or incorrectly, abnormal operation, error or
dropping may be caused.
Be sure that I/O or extension connecter is correctly secured. If
not, electric shock, fire or abnormal operation may be caused.
If lots of vibration is expected in the installation environment,
don’t let PLC directly vibrated. Electric shock, fire or abnormal
operation may be caused.
Don’t let any metallic foreign materials inside the product, which
may cause electric shock, fire or abnormal operation..
Caution

Safety Instruction
Safety Instructions when wiring
Prior to wiring, be sure that power of PLC and external power is
turned off. If not, electric shock or damage on the product may be
caused.
Before PLC system is powered on, be sure that all the covers of
the terminal are securely closed. If not, electric shock may be caused
Warning
 Let the wiring installed correctly after checking the voltage rated
of each product and the arrangement of terminals. If not, fire,
electric shock or abnormal operation may be caused.
Secure the screws of terminals tightly with specified torque when
wiring. If the screws of terminals get loose, short circuit, fire or abnormal
operation may be caused.
*
Surely use the ground wire of Class 3 for FG terminals, which is
exclusively used for PLC. If the terminals not grounded correctly,
abnormal operation may be caused.
Don’t let any foreign materials such as wiring waste inside the
module while wiring, which may cause fire, damage on the product
or abnormal operation.
Caution

Safety Instruction
Safety Instructions for test-operation or repair
Safety Instructions for waste disposal
 Don’t touch the terminal when powered. Electric shock or abnormal
operation may occur.
Prior to cleaning or tightening the terminal screws, let all the
external power off including PLC power. If not, electric shock or
abnormal operation may occur.
 Don’t let the battery recharged, disassembled, heated, short or
soldered. Heat, explosion or ignition may cause injuries or fire.
Warning
 Don’t remove PCB from the module case nor remodel the module.
Fire, electric shock or abnormal operation may occur.
 Prior to installing or disassembling the module, let all the external
power off including PLC power. If not, electric shock or abnormal
operation may occur.
Keep any wireless installations or cell phone at least 30cm away
from PLC. If not, abnormal operation may be caused.
Caution
 Product or battery waste shall be processed as industrial waste.
The waste may discharge toxic materials or explode itself.
Caution

◎Contents ◎
CHAPTER 1 Introduction 1-1~1-5
1.1 Overview............................................................................................................................1-1
1.2 Characteristics...................................................................................................................1-2
1.3 Terminology .......................................................................................................................1-4
CHAPTER 2 System Configuration................................................................2-1~2-11
2.1 XGT Series System Configuration.....................................................................................2-1
2.2 List of Configuration Products............................................................................................2-2
2.3 Basic System.....................................................................................................................2-6
2.3.1 Configuration method of basic system ................................................................................. 2-6
2.3.2 Max. configuration of basic system (Point fixed).................................................................. 2-7
2.3.3 Max. configuration of basic system (Point variable)............................................................. 2-8
2.3.4 Terminator connections ........................................................................................................ 2-9
2.4 Network System...............................................................................................................2-10
2.4.1 Network systems................................................................................................................ 2-10
2.4.2 Remote I/O system..............................................................................................................2-11
CHAPTER 3 General Specifications........................................................................3-1
3.1 General Specifications.......................................................................................................3-1
CHAPTER 4 CPU Module..................................................................................4-1~4-7
4.1 Technical Specifications.....................................................................................................4-1
4.2 Part Names and Functions................................................................................................4-3
4.3 Battery ...............................................................................................................................4-6
4.3.1 Battery specifications............................................................................................................ 4-6
4.3.2 Notice in using...................................................................................................................... 4-6
4.3.3 Battery durability................................................................................................................... 4-6

4.3.4 Changing the battery............................................................................................................ 4-7
CHAPTER 5 Program Configuration and Operation Method.......................5-1~5-25
5.1 Program Introduction.........................................................................................................5-1
5.1.1 Program execution methods................................................................................................ 5-1
5.1.2 Operation processing during momentary power failure....................................................... 5-2
5.1.3 Scan Time ............................................................................................................................ 5-3
5.2 Program Execution............................................................................................................5-5
5.2.1 Program configuration.......................................................................................................... 5-5
5.2.2 Program execution method..................................................................................................5-5
5.2.3 Interrupt................................................................................................................................ 5-7
5.3 Operation Mode...............................................................................................................5-13
5.3.1 RUN mode.......................................................................................................................... 5-13
5.3.2 STOP mode........................................................................................................................ 5-14
5.3.3 DEBUG mode..................................................................................................................... 5-14
5.3.4 Changing operation mode..................................................................................................5-15
5.4 Memory............................................................................................................................5-16
5.4.1 Program memory ............................................................................................................... 5-16
5.4.2 Data memory...................................................................................................................... 5-17
5.5 Configuration Diagram of Data Memory..........................................................................5-19
5.5.1 XGK-CPUE......................................................................................................................... 5-19
5.5.2 XGK-CPUS......................................................................................................................... 5-20
5.5.3 XGK-CPUA......................................................................................................................... 5-21
5.5.4 XGK-CPUH......................................................................................................................... 5-22
5.5.5 XGK-CPUU......................................................................................................................... 5-23
5.5.5 Data Latch Area settings .................................................................................................... 5-24
CHAPTER 6 Functions of CPU Module..........................................................6-1~6-17
6.1 Self-Diagnosis....................................................................................................................6-1
6.1.1 Scan Watchdog Timer.......................................................................................................... 6-1
6.1.2 I/O Module Check function................................................................................................... 6-2
6.1.3 Battery Voltage Check function............................................................................................6-2
6.1.4 Error History Save................................................................................................................ 6-2

6.1.5 Troubleshooting .................................................................................................................. 6-2
6.2 Clock..................................................................................................................................6-4
6.3 Remote Function ...............................................................................................................6-6
6.4 Forced I/O On/Off Function ...............................................................................................6-7
6.4.1 Forced I/O setup method ..................................................................................................... 6-7
6.4.2 Forced On/Off execution point and execution method......................................................... 6-8
6.5 Direct I/O Operation...........................................................................................................6-8
6.6 Saving Operation History...................................................................................................6-9
6.6.1 Error history.......................................................................................................................... 6-9
6.6.2 Mode conversion history...................................................................................................... 6-9
6.6.3 Power shutdown history....................................................................................................... 6-9
6.6.4 System history...................................................................................................................... 6-9
6.7 External Device Error Diagnosis......................................................................................6-11
6.8 Error Mask.......................................................................................................................6-13
6.9 I/O Module Skip...............................................................................................................6-14
6.10 Changing Module during Operation...............................................................................6-15
6.11I/O No. Allocation Method...............................................................................................6-16
6.11.1 Fixed I/O no. allocation..................................................................................................... 6-16
6.11.2 Variable I/O no. allocation................................................................................................. 6-16
6.11.3 Module reservation function.............................................................................................. 6-17
6.12 Program Modification during Operation.........................................................................6-17
CHAPTER 7 I/O Module...................................................................................7-1~7-24
7.1 Notice in selecting module.................................................................................................7-1
7.2 Digital Input Module Specifications....................................................................................7-3
7.2.1 8 point DC24V Input module (Source/Sink Type)................................................................ 7-3
7.2.2 16 point DC24V Input module (Source/Sink Type).............................................................. 7-4
7.2.3 16 point DC24V Input module (Source Type) ...................................................................... 7-5
7.2.4 32 point DC24V Input module (Source/Sink Type).............................................................. 7-6
7.2.5 32 point DC24V Input module (Source type)....................................................................... 7-7
7.2.6 64 point DC24V Input module (Source/Sink Type).............................................................. 7-8
7.2.7 64 point DC24V Input module (Source Type) ...................................................................... 7-9
7.2.8 16 point AC110V Input module........................................................................................... 7-10
7.2.9 8 point AC220V Input module .............................................................................................7-11
7.3 Digital Output Module Specifications...............................................................................7-12

7.3.1 8 point Relay Output module..............................................................................................7-12
7.3.2 16 point Relay Output module............................................................................................ 7-13
7.3.3 16 point Relay Output module (Surge Absorber built-in Type) .......................................... 7-14
7.3.4 16 point Triac Output module............................................................................................. 7-15
7.3.5 16 point Transistor Output module(Sink Type)................................................................... 7-16
7.3.6 32 point Transistor Output module(Sink Type)................................................................... 7-17
7.3.7 64 point Transistor Output module(Sink Type)................................................................... 7-18
7.3.8 16 point Transistor Output module(Source Type) .............................................................. 7-19
7.3.9 32 point Transistor Output module(Source Type) .............................................................. 7-20
7.3.10 64 point Transistor Output module(Source Type)............................................................ 7-21
7.4 Digital IO Module.............................................................................................................7-22
7.4.1 32 point I/O Combination module ......................................................................................7-22
7.5 Event Input Module..........................................................................................................7-23
7.5.1 Event Input Module............................................................................................................ 7-23
7.5 Smart Link........................................................................................................................7-24
7.5.1 Smart Link connectable module......................................................................................... 7-24
7.5.2 Smart Link connection........................................................................................................ 7-24
CHAPTER 8 Power Module...............................................................................8-1~8-5
8.1 Selection Method...............................................................................................................8-1
8.2 Specifications.....................................................................................................................8-3
8.3 Part Names........................................................................................................................8-4
8.4 Current Consumption/Power Calculation Example............................................................8-5
CHAPTER 9 Base and Extended Cable ...........................................................9-1~9-2
9.1 Specifications.....................................................................................................................9-1
9.1.1 Main base............................................................................................................................. 9-1
9.1.2 Extended base ..................................................................................................................... 9-1
9.1.3 Extended cable .................................................................................................................... 9-1
9.2 Part Names........................................................................................................................9-2
9.2.1 Main base............................................................................................................................. 9-2
9.2.2 Expansion base.................................................................................................................... 9-2

10.1 Features .......................................................................................................................10-1
10.2 PID Control ..................................................................................................................10-1
10.3 PID Control Operation ..................................................................................................10-2
10.3.1 Terms .............................................................................................................................. 10-2
10.3.2 PID Expressions ............................................................................................................. 10-2
10.3.3 P Control ......................................................................................................................... 10-3
10.3.4 PI Control ........................................................................................................................ 10-4
10.3.5 PID Control ..................................................................................................................... 10-5
10.4 PID Instructions ............................................................................................................10-6
10.4.1 PID Loop States ............................................................................................................. 10-6
10.4.2 PID Instruction Group ..................................................................................................... 10-7
10.5 PID Flag Configuration .................................................................................................10-9
10.5.1 Common Bit Area ............................................................................................. .........10-11
10.5.2 Individual Data Area ..................................................................................................... 10-14
10.6 Convenient Additional Functions of PID Instructions .................................................10-21
10.6.1 Various PID-based control methods ............................................................................. 10-21
10.6.2 Operation and function of anti wind-up ........................................................................10-21
10.6.3 Operation and function ofAuto-tuning (AT) ..................................................................10-21
10.6.2 Operation and function of cascade (CAS) ....................................................................10-21
10.7 How to Use PID Instructions ......................................................................................10-22
10.7.1 Hardware Configuration ............................................................................................... 10-22
10.7.2 Program example 1 ......................................................................................................10-21
10.7.3 PID controlling .............................................................................................................. 10-26
10.7.4 How to start up using AT (Auto-tuning) ....................................................................... 10-32
10.7.5 Program example 2 ......................................................................................................10-33
10.7.6 Startup using PWM ....................................................................................................... 10-34
10.7.7 Cascade startup ........................................................................................................... 10-35
CHAPTER 11 Installation and Wiring.........................................................11-1~11-12
11.1 Installation...................................................................................................................... 11-1
11.1.1 Installation environment.....................................................................................................11-1
CHAPTER 10 Built-in PID Functions .....................................................10-1~10-35

11.1.2 Handling precautions.........................................................................................................11-4
11.1.3 Attachment/Detachment of module ...................................................................................11-7
11.2 Wiring.............................................................................................................................11-9
11.2.1 Power wiring......................................................................................................................11-9
11.2.2 I/O Device wiring .............................................................................................................11-11
11.2.3 Ground wiring..................................................................................................................11-11
11.2.4 Cable specifications for wiring.........................................................................................11-12
CHAPTER 12 Maintenance and Repair........................................................12-1~12-2
12.1 Repair and Checking.....................................................................................................12-1
12.2 Daily Checking...............................................................................................................12-1
12.3 Regular Checking..........................................................................................................12-2
13.1 Requirements for Conformance to EMC Directive.........................................................13-1
13.1.1 EMC Standard.................................................................................................................. 13-1
13.1.2 Control Panel ................................................................................................................... 13-2
13.1.3 Cables.............................................................................................................................. 13-3
13.2 Requirement to Conform to the Low-voltage Directive..................................................13-4
13.1.1 Standard Applied for MasterLogic-200 Series.................................................................. 13-4
13.1.2 XGT Series PLC Selection............................................................................................... 13-4
CHAPTER 14 Troubleshooting...................................................................14-1~14-16
14.1 Basic Procedure for Troubleshooting.............................................................................14-1
14.2 Troubleshooting.............................................................................................................14-1
14.2.1 Action when Power LED is OFF....................................................................................... 14-2
14.2.2 Action when ERR LED is blinking .................................................................................. 14-3
14.2.3 Action when RUN, STIOP LED is OFF .......................................................................... 14-4
14.2.4 Action when I/O Module does not work normally ........................................................... 14-5
14.2.5 Action when Program Write does not work normally ...................................................... 14-7
14.3 Questionnaire for Troubleshooting.................................................................................14-8
14.4 Cases.............................................................................................................................14-9
CHAPTER 13 EMC Directive .....................................................................13-1~13-4

14.4.1 Input circuit error types and corrective actions ................................................................ 14-9
14.4.2 Output circuit error types and corrective actions............................................................ 14-10
14.5 Error Code List.............................................................................................................14-12
14.5.1 Error code during CPU operation...................................................................................14-12
14.5.2 Error code of program operation.................................................................................... 14-15
Appendix 1 Flag List .......................................................................App.1-1~App.1-14
App.1.1 Special Relay (F) List ..........................................................................................App.1-1
App.1.2 Communication Relay (L) List.............................................................................App.1-9
App.1.3 Link Register (N) List.........................................................................................App.1-12
Appendix 2 Dimensions....................................................................App.2-1~App.2-3
Appendix 3 Compatibility with MASTER-K .....................................App.3-1~App.3-5
Warranty

Revision History
Version Date Contents Chapter
V 1.0 2006. 2 First Edition -
V1.1 2009.10
1. XGK-CPUU added
2. Fnet ->Rnet modified
3. Scan Time modified
4. Interrupt module removed
5. Clock data F device modified
6. Heavy error/light error modified
7. Fault mask -> “Release byprogram” removed
8. Skip function -> “Release byprogram” removed
9. Product list modified
10. Program language SFC, ST added
11. XGQ-SOEAadded
12. Flag list modified
Ch1.1, Ch2.3.1, Ch2.4.1, Ch4.1
Ch1.3
Ch5.1.3
Ch7.1
Ch6.2
Ch6.7
Ch6.8
Ch6.9
Ch2.2
Ch4.1
Ch7.5
Appendix 1
V1.6 2010.3
1. Product list modified
2. Supported functions accordingto OS version
3. Description on Reset/D.Clear switch added
4. Wiring diagram of Smart Linkadded
5. Flag added
(indicated version to decimal places _OS_VER_PATCH)
6. Typos fixed
Ch2.2, Ch2.4.2
Ch4.1
Ch4.2
Ch7.6.3
App1.1
Ch1.1, Ch1.2, Ch1.3
Ch3.1, Ch4.1
Ch5.2.3, Ch5.5
Ch8.1
Ch10.3, Ch10.7
CH12.2, 12.3
The number of User’s manual is indicated right part of the back cover.※
ⓒLS Industrial Systems Co., Ltd 2008 All Rights Reserved.

About User’s Manual
About User’s Manual
Thank you for purchasing PLC of LS Industrial System Co., Ltd.
Before use, make sure to carefully read and understand the User’s Manual about the functions,
performances, installation and programming of the product you purchased in order for correct
use and importantly, let the end user and maintenance administrator to be provided with the
User’s Manual.
The User’s Manual describes the product. If necessary, you may refer to the following
description and order accordingly. In addition, you may connect our website(http://eng.lsis.biz/)
and download the information as a PDF file.
Relevant User’s Manuals
Title Description No. of User’s
Manual
XGK / XGB
Instructions &
Programming
It is the user’s manual for programming to
explain how to use commands that are used
PLC system with XGK CPU and XGB CPU.
10310000510
XG5000
It describes how to use XG5000 software
especially about online functions such as
programming, printing, monitoring and
debugging by using XGT series products.
10310000512

Chapter 1 Introduction
1-1
Chapter 1 Introduction
1.1Overview
This User’s Manual provides the information for the specification, performance and operation method of each
product required to use a PLC system configured by XGK series CPU modules.
The configuration of User’s Manual is as follows :
Chapter Items Description
Chapter 1 Overview Describes the configuration of this user’s manual, product
characteristics and terminology.
Chapter 2 System Configuration Describes the product type and system configuration method to be
used for XGK series.
Chapter 3 General Specifications Shows the common specification of each module used for XGK
series.
Chapter 4 CPU Module
Chapter 5 Program Configuration and
Operation Method
Chapter 6 Function of CPU Module
Describes the performance, specification and operation method of
XGK-CPU
Chapter 7 I/O Module
Chapter 8 Power Module
Chapter 9 Base and Extended Cable
Describes the specification and the method to use I/O module and
power module except CPU module.
Chapter 10 Built-in PID Describes on the built-in PID function
Chapter 11 Installation and Wiring Describes the installation, wiring method and notices to secure the
reliability of PLC system.
Chapter 12 Maintenance & Repair Describes the checking items and methods to run the PLC system
normally for a long time.
Chapter 13 EMC Directive Summarizes the precautions on conformance to the EMC Directive of
the machinery assembled using XGK series.
Chapter 14 Trouble Shooting Describes various errors and action methods occurred while using a
system.
Appendix 1 Flag List Describes various type of each flag and its description.
Appendix 2 Dimensions Shows the outer dimension of CPU, I/O module and Base.
Appendix 3 Compatibility with MASTER-K
Notes
1) This user’s manual does not describe the special/communication module and program writing method.
For the corresponding function, please refer to the related user’s manual.
2) XGK CPU is one of the XGT PLC system and CPU types of XGT PLC system are as follows.
①XGK series: XGT PLC system that cosists of CPU using Master-K
②XGI series: XGT PLC system that consists of single CPU using IEC language
③XGR series: XGT PLC system that consists of redundaccy CPU using IEC language

Chapter 1 Introduction
1-2
1.2 Characteristics
XGK system has the features as below.
1) Compact size
The function is extended to large sized but the size is reduced innovatively to make the installation in the
small space for any purpose easily.
2) High speed processing
(1) High speed processing by the development of dedicated micro processor is realized.
(based on XGK-CPUU)
•Sequence instruction: 0.028 μs
•MOV instruction: 0.084 ㎲
•Floating point arithmetic operation: the operation for the single real number and double real number
accuracy is profoundly improved.
Classification +−×÷
Single Real 0.602 ㎲0.602 ㎲1.106 ㎲1.134 ㎲
Double Real 1.078 ㎲1.078 ㎲2.394 ㎲2.66 ㎲
(2) Improvement of data transfer speed between modules through base.
•16 point I/O module data processing : 0.20 μs ~ 0.80 μs
•Analog 1 channel data processing : 0.20 μs ~ 0.80 μs
•1 Kbyte communication module data processing : 12.8 μs
•Parallel processing by I/O data automatic refresh during program operation
3) Convenience to use Analog Data
Analog module enforced the precision and stability and provides the convenience as below :
•Program simplification by providing analog data dedicated ‘U ‘ device
•Setting without memory map of special module is available by providing parameter setting method.
4) System Configuration
Various convenient functions are provided to meet the demands of users.
•Filter value adjustment of input module
•Output hold at emergency time
•Varistor built-in relay output module with strong durability
•Total extension length of expanded base shall be 15m.
•Provides system RUN contact to power module.
•Cost efficiency of setup, startup and maintenance/repair by enforced self-diagnosis function

Chapter 1 Introduction
1-3
5) Various communication system
Provides various network function to satisfy both the user convenience and compatibility.
•Network opening available without writing a ladder program
•Network setting and operation status monitoring by dedicated tool(XG-PD)
•Supports Open network of various international specification
•Dedicated network to provide the ease in use and optimal performance
•Network compatibility with the existing products (MASTER-K, GLOFA-GM)
6) Enforcement of program and online function
Minimized the program writing time by providing the convenience of programming and available to
complete the control system of equipment without stopping the system by enforcement of online function.
•Compatibility of ladder and text (Mnemonic) method
•Enforcement of symbolic program
•Automatic conversion of MASTER-K program
•Available to modify the program during operation and secure the stability
•Available to install and change the network during operation
•Enforcement of trend monitoring function
•User event function
•Data trace function
7) User’s convenience
Various functions are provided for user’s convenience.
•Module Changing Wizard (User’s tool is unnecessary.)
•System Diagnosis
•Skip I/O
•Fault Mask
•I/O Allocation Method
•Various Operation History

Chapter 1 Introduction
1-4
1.3Terminology
Here describes the terminology used in this user’s manual.
Terminology Definition Remarks
Module A device like I/O board assembled to insert in a motherboard or base as a standardized factor having the regular function to
configure the system.
Ex)
CPU module,
power module,
I/O module etc.
Unit A module or module aggregate which is the minimum unit in
operation of PLC system. It configures the PLC system by
connecting to other module or module aggregate.
Ex)
Basic unit,
Extended unit
PLC System A system consisted of PLC and peripherals and which is
configured to enable the control by user program
XG 5000 Graphic loader to carry out program writing, editing and debug
function
I/O image area Internal memory area of CPU module installed to maintain the
input and output state
Rnet Remote Network (Remote dedicated network)
Fnet Field bus Network
RAPIEnet Real-time Automation Protocols for Industrial Ethernet
Cnet Computer Network
FEnet Fast Ethernet Network
Pnet Profibus-DP Network
Dnet DeviceNet Network
RTC Real Time Clock. A general name of universal IC having the
clock function
Watchdog Timer A timer to monitor the assigned running time of program and give an alarm if failed to complete the processing within the assigned
time.
Task There are three kind of tasks. (cycle time task, internal device
task, external device task by external interrupt module’s input
signal)

Chapter 1 Introduction
1-5
Terminology Definition Remarks
Sink input
The mode that the current flows from the switch to PLC input terminal
when input signal is ON.
Z : Input
resistance
Source input
The mode that the current flows from PLC input terminal to the switch
when input signal is ON.
Sink output
The mode that the current flows from load to output terminal when
PLC output contact is ON.
Source output
The mode that the current flows from output contact when PLC output
contact is ON.
+
−
Z
Power
PLC
Switch
Common
Current
+
−Z
Power
PLC
Current
Switch
Common
+
−
Power
PLC
Current
Output contact
Common
Load
−
Power
PLC
Current
Output
contact
Common
+
Load