ReadParameter | Siemens CP 243-2 guide

Command Interface

5.2.4Read_Parameter

Purpose

This call returns the current parameter value (actual parameter) of a slave.

This value must not be confused with the parameter echo that is supplied by the AS-i slave as a reply to the write_parameter job.

Structure of the Job Data in the Send Buffer

Bank Byte

20

21

Meaning

Command number: 03 H

AS-i slave address

Structure of the Job Data in the Receive Buffer

Bank Byte

2	0

21

22

		Meaning

Bit 7		Bit 4	Bit 3	Bit 0

	Echo of the command number: 03 H
		Command status

irrelevant			Parameter

5-16	SIMATIC NET CP 243-2 AS-i Master
	C79000-G8976-C142/02

Image 84

Siemens CP 243-2 installation instructions ReadParameter

Contents

AS-Interface Master ManualAppendix 07/2000 C79000-G8976-C142 Release Safety Guidelines Qualified PersonnelCorrect Usage Trademarks We recommend the following procedure when PrefacePurpose of the Manual Requirements Preface Contents Signaling Errors and Diagnostics in the User Program Command InterfaceDealing with Problems / Error Displays Glossary Index References Simatic NET ± Support and Training Contents Technical Description and Installation Instructions General Notes on Operation ± Safety Warnings Uses of the Module DP Slave and AS-i MasterAS-i Master Components Supplied Technical Specifications of the Module FeatureExplanation/Values Installing the Module Slots in the S7-200Possible Restrictions Front Panel ± Access to all Functions Connection, Display and Control Elements Terminal Block ConnectionsConnections to the AS-i Cable Technical Description and Installation Instructions Modes of the CP Standard OperationExtended Operation Displays and Operator Controls Changing the Display Status ± Display ButtonMeaning of the LEDs SET Button Status Display Interpreting the Status DisplayLED color Status LED color Status SF red System error Meaning Characteristics of the Slave Display Slave DisplayInterpreting the Slave Display Status Display Statuses in Detail Example of a Slave Display Example of a Slave Display Configuring the AS-Interface with the SET Button Configuration ModeProtected Mode Interpreting the Display Status Preparing to Configure Configuring Technical Description and Installation Instructions Interface to the User Program S7-200 CPU Overview CP 243-2 as Expansion Module in the S7-200S7-200 CPU Digital Module Analog Module Addressing the CP 243-2 in the S7-200 CPU Address AreasExamples CPU Example of a CPU 224, a CP 243-2 and a CP CPU 14 DI 10 do CPU 14DI 10 do Module Meaning of the Data in the Digital Module Overview Identification Register in the Digital Module MeaningRange of Values Example Error Register in the Digital Module Example of Access to the Error RegisterMeaning for the User Program Status Byte Input Register 8DI Structure of the Status ByteDescription of the Bits Bit Value Control Byte Output Register 8DO Structure of the Control ByteBit Value Meaning Meaning of the Data in the Analog Module Digital module 8DI/8DO Identification Register in the Analog Module Error Register in the Analog Module Structure of the Error RegisterBit Description/Range of Values Example of Access to the Error Register Access to the Analog Input and Output Words Access in the User ProgramPrinciple Advantage Interface to the User Program in the S7-200 CPU Analog Input Area Assignment of the Input AreasS7-200 CPU Bank 1 Diagnostics on the AS-Interface Banks 2±15 Response data on the AS-InterfaceBanks 16±30 Reserved area Bank 31 Binary input data of the AS-i slaves 1B ± 31B Banks 32±47 Analog input data of the AS-i slaves Banks 48±63 Reserved area Analog Output Area Assignment of the Output AreasBank 1 reserved Banks 2±15 Command data on the AS-Interface Bank 31 Binary output data of the AS-i slaves 1B ± 31BBanks 32±47 Analog output data of the AS-i slaves Access to the Data of the AS-i Slaves Access to the Binary Values Bank Byte no Bit 7±4 Bit 3±0 Reserved Slave 1B Data Exchange in the Stop Mode of the S7-22x CPU Special Feature of Analog Slaves AS-i slaves Output byte Access to the AS-i User Data Data Access with Micro Access to the Analog Values Assignment of the AS-i Analog DataBank Byte no Meaning Simatic NET CP 243-2 AS-i Master C79000-G8976-C142/02 Access to the Data of the AS-i Slaves Access to the Data of the AS-i Slaves Access to the Data of the AS-i Slaves Access to the Data of the AS-i Slaves Representation of the Analog Values Special Situations Access to the AS-i Analog Data SBR 4 STL Access to the Data of the AS-i Slaves Signaling Errors and Diagnostics User Program Signaling Error Signaling Example Reading the Delta List STL Example Signaling Errors and Diagnostics in the User Program Command Interface Command interface of the CP Command Buffer and Response Buffer Command Sequence AS-i master User program Reaction to command Example SBR 3 STL Q1.0 Select bank AIW0, VW512 Description of the AS-i Commands NameParameter Return LPF General Structure of the Command Buffer Bank Byte Meaning / Content General Structure of the Response Buffer Bank Byte Command Status General Structure of the AS-i Slave Address Bit Slave address SetPermanentParameter PurposeStructure of the Job Data in the Send Buffer Structure of the Job Data in the Receive Buffer GetPermanentParameter Purpose of the Command WriteParameter ReadParameter StoreActualParameters SetExtendedPermanentConfiguration ID codeExtended ID2 code GetExtendedPermanentConfiguration StoreActualConfiguration GetExtendedActualConfiguration SetExtendedLPS Reserved Mode SetOfflineMode SelectAutoprogramming SetOperationMode ChangeAS-iSlaveAddress Parity error detected Error detected End bit error detectedRead error in non-volatile memory GetAS-iSlaveStatus Reserved GetLPS, GetLAS, GetLDS, GetFlags Flag Bit Number Meaning Meaning of the Flags GetExtendedTotalConfiguration Idcode slave Ext ID1 slave Command Interface Command Interface Reserved Parameter slave 1B StoreExtendedTotalConfiguration Idcode slave Ext ID1 Slave Configuration slave Ext ID2 slave Command Interface Command Interface Configmode Autoaddrenable Echo of the command number 3A H Command status WriteExtendedParameterList Echo of the command number 3C H Command status ReadExtendedParameterEchoList Command Interface ReadVersionID Purpose ReadAS-iSlaveID Reserved ID code ReadAS-iSlaveID1 Reserved Extended ID1 code WriteAS-iSlaveExtendedID1 Irrelevant Extended ID1 code ReadAS-iSlaveID2 Reserved Slave ID2 Reserved Configuration ReadAS-iSlaveI/O GetLPF WriteAS-iSlaveParameterString ReadAS-iSlaveParameterString Byte Meaning ReadAS-iSlaveIDString ReadAS-iSlaveDiagnosticString Structure of the Command Buffer ReadDataandDeltaListStructure of the Response Buffer Delta Slave Reserv Slave 7B Slave 6B Command Interface Dealing with Problems / Error Displays Simple Replacement of AS-Interface Slaves Detecting Defective AS-Interface SlavesYou can now replace the defective slave as follows Error Displays of the CP 243-2 / Remedying Errors ErrorPossible Cause Remedy Error Possible Cause Remedy Dealing with Problems / Error Displays Dealing with Problems / Error Displays Pics for the CP List of Master Functions AvailableComment / Function implemented by / Section AS-Interface Protocol Implementation Function or Call on the Host Interface Idcod AS-Interface Protocol Implementation References Simatic S7-200 Order numbers References Installation Instructions Product NameEU Directive EMC 89/336/EEC Area of Application Simatic NET CP 243-2 AS-i Master C79000-G8976-C142/02 Simatic NET ± Support and Training Simatic Training CenterSimatic Customer Support Hotline Nuremberg Johnson City Singapore Simatic Basic Hotline Simatic Customer Support Online Services Further SupportSimatic Premium Hotline Glossary AS-i module AS-i slaveAS-i standard slave Extended AS-i master Nibble Standard AS-i master Glossary-4 Index PICS, A-1