Plc Modicon Software Block Library V0

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Modicon
Ladder Logic Block Library User Guide
840 USE 101 00 Version 3.0
August 2001
Schneider Electric
One High Street
North Andover , MA 01845
Preface
Thedataandillustrations found in this book are not binding. We
reserve the right to modify our products in line with our policy of
continuous product development. The information in this document is
subject to change without notice and should not be construed as a
commitment by Schneider Electric.
Schneider Electri c assumes no responsibility for any errors
that may appear in this document. If you have any suggestions for
improvements or amendments or have found errors in this publication,
please notify us by using the form on the last page of this publication.
Nopartofthis document may be reproduced in any form or by any
means, electronic or mechanical, including photocopying, without
express written permission of the Publisher, Schneider Electric.
Caution: All pertinent state, regional, and local safety
regulations must be observed when installing and using this
product. For reasons of safety and to assure compliance with
documented system data, repairs to components should be
performed only by the manufacturer .
MODSOFT is a registered trademark of Schneider Electric.
The following are trademarks of Schneider Electric.
Modicon QuantumAutomationSeries
ModbusPlus Modbus
ModbusII 984 PLC
Compact984PLC Modicon Micro PLC
DIGITALandDECareregisteredtrademarksofDigitalEquipment
Corporation.
IBMandIBMATareregisteredtrademarksofInternational
Business Machines Corporation.
Microsoft and MSDOSare registered trademarks of Microsoft
Corporation.
 Copyright 20 01, Schneider Electric
Printed in U.S.A.
840USE10100 Preface iii
Contents
Chapter 1 Ladder Logic Overview ........................... 1
1.1 SegmentsandNetworksinLadderLogic ......................... 2
1.1.1 ALadderLogicNetwork ............................. 2
1.1.2 Coil Placement in a Network ......................... 3
1.1.3 Ladder Logic Segments .............................. 4
1.2 HowaPLCSolvesLadderLogic ................................. 5
1.3 Ladder Logic Elements and Instructions .......................... 7
Chapter 2 Memory Allocation in a PLC ....................... 11
2.1 UserMemory .................................................. 12
2.1.1 User Logic .......................................... 12
2.1.2 User Memory ....................................... 12
2.1.3 SystemOverhead ................................... 13
2.1.4 MemoryBackup .................................... 13
2.2 State RAMValues .............................................. 14
2.2.1 AReferencing System for Inputs and Outputs ......... 14
2.2.2 Storing Discrete and Register Data in State RAM ...... 15
2.3 State RAMStructure ........................................... 16
2.3.1 MinimumRequiredStateRAMValues ................ 17
2.3.2 History and Disable Bits for Discrete References ....... 17
2.4 TheConfiguration Table ........................................ 18
2.4.1 Assigning a Battery Coil ............................. 18
2.4.2 Assigning a Timer Register .......................... 18
2.4.3 TheTimeofDayClock ............................... 19
2.4.4 Configuration Overview ............................. 20
2.5 TheI/OMapTable.............................................. 22
2.5.1 Determining the Size of the I/O Map Table ............. 22
2.5.2 Writing Data to the I/O Map Table .................... 22
840 USE 101 00 v
Contents
Chapter 3 Ladder Logic Opcodes ........................... 23
3.1 Translating Ladder Logic Elements in System Memory ............ 24
3.1.1 Translating Logic Elements and Non-DX Functions .... 24
3.2 Translating DX Instructions in the System Memory Database ...... 26
3.2.1 HowthexandzBitsAreUsedin16-bitNodes ......... 26
3.2.2 HowthexandzBitsAreUsedin24-bitNodes ......... 27
3.2.3 Opcodes for Standard DX Instructions ................ 28
3.2.4 HowtheyBitsareUtilizedforDXFunctions .......... 28
3.3 OpcodeDefaults for Loadables ................................... 29
3.3.1 HowtoHandleOpcodeConflicts ...................... 29
Chapter 4 Ladder Logic Elements ........................... 31
4.1 Contacts ....................................................... 32
4.1.1 Normally Open Contacts ............................. 32
4.1.2 Normally Closed Contacts ............................ 33
4.1.3 Positive Transitional Contacts ........................ 33
4.1.4 Negative Transitional Contacts ....................... 34
4.2 Coils .......................................................... 36
4.2.1 NormalCoils ....................................... 36
4.2.2 Latched or Memory-retentive Coils ................... 36
4.2.3 ASimpleContact-Coil logic Example .................. 37
4.2.4 Coil Usage in a Logic Network ........................ 37
4.2.5 General Coil Usage Guidelines ....................... 38
4.3 Shorts ......................................................... 39
4.3.1 Horizontal Shorts ................................... 39
4.3.2 Vertical Shorts ...................................... 39
4.4 Using Logic Elements to Create Control Circuits .................. 40
4.4.1 ALogical ANDCircuit ............................... 40
4.4.2 ALogical OR Circuit ................................ 40
4.4.3 ALogical XORCircuit ............................... 41
4.4.4 Building a Seal Circuit .............................. 41
4.5 Storing Contacts and Coils in Registers ........................... 43
4.6 NOBT ......................................................... 45
4.7 NCBT ......................................................... 47
4.8 NBIT.......................................................... 49
4.9 SBIT .......................................................... 51
4.10 RBIT .......................................................... 53
vi Contents 840 USE 101 00

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...Modicon ladder logic block library user guide use version august schneider electric one high street north andover ma preface thedataandillustrations found in this book are not binding we reserve the right to modify our products line with policy of continuous product development information document is subject change without notice and should be construed as a commitment by electri c assumes no responsibility for any errors that may appear if you have suggestions improvements or amendments publication please notify us using form on last page nopartofthis reproduced means electronic mechanical including photocopying express written permission publisher caution all pertinent state regional local safety regulations must observed when installing reasons assure compliance documented system data repairs components performed only manufacturer modsoft registered trademark following trademarks quantumautomationseries modbusplus modbus modbusii plc compactplc micro digitalanddecareregisteredtrade...

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