GE P485 instruction manual Data exchange, Overview

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GE Consumer & Industrial

P485 Modbus to Profibus

Converter

Chapter 3: Data exchange

Overview

DESCRIPTION Data from the fieldbus (Profibus) and the sub network (Modbus) is stored in an internal memory buffer. This is a easy method for data exchange where the fieldbus control system simply reads and writes data to pre-defined memory locations, and the serial sub network also use the same internal memory buffer to read and write data. Refer to Figure 3-2: Data exchange overview on page 3–2for details.

INTERNAL MEMORY BUFFER STRUCTURE

The internal memory buffer can be seen as a memory space with three different types of data; input data, output data and general data.

Input data: This is data that should be sent to the fieldbus. The P485 can handle up to 244 bytes of input data. The total input/output data must not exceed 416 bytes.

Output data: this is data recieved from the fieldbus. The P485 can handle up to 244 bytes of output data.

General data: This data cannot be accessed from the fieldbus, and is used for transfers between nodes on the sub-network, or as a general “scratch pad” for data. The P485 can handle up to 1024 bytes of general data.

Internal Memory Buffer

 

Input data

 

 

(up to 244 bytes)

 

Sub Network

Output data

Fieldbus

(up to 244 bytes)

 

 

General data

 

 

1024 bytes

 

Figure 3-1: Internal memory buffer

P485 MODBUS TO PROFIBUS CONVERTER – USER GUIDE

3–1

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Contents GE Multilin P485 Modbus to Profibus ConverterPage P485 Modbus to Profibus Converter Table of contentsSoftware Frame Miscellaneous Getting started IntroductionInput and output definition Document conventionsFeatures FeaturesAbout the P485 Modbus to Profibus Converter Communications SpecificationsMechanical Housing OrderingQuick install InstallationElectrical installation Pin Signal Description Profibus connector pin assignmentsPin Description Configuration cable pin assignments P485 endConfiguration cable PC end Indicators and switches Mechanical installation Number Description State Status P485 status indicatorsInput/output bytes required Modules Profibus installation procedurePoor performance TroubleshootingOverview Data exchangeMemory Map Address Contents AccessBlocks Protocol configurationData Exchange Software overview Installation procedureIntroduction Select Configuration Wizard and click on OK Using the EnerVista P485/D485 Setup softwareTypical network arrangement Sub-network data flow Address Command Software Overview P485 Modbus to Profibus Converter User Guide Software Overview Configurator main window Configuration main windowInformation window Function Description Fieldbus configurationP485/D485 configuration P485/D485 configurationParameter Description Range Modbus network configurationSoftware Overview PLC Communication modelP485 scan list Basic settingsMenu NodesCommunication Model P485 Modbus to Profibus Converter User Guide Communication Model Frame editor Frame and command editorsSelect command window Command editorQuery Column Select ‘Add Command’ as described earlierMain window Modbus network monitor Modbus network and node monitorsStart / Stop sub network scanning Node monitor Update OFF Update onCommand Area Control and status registers Advanced functionsCode Name Description Bits Name DescriptionHandshake bits themselves bits 14 Code Error DescriptionFieldbus control system Input/output data during startupMailbox command Advanced fieldbus configurationAdvanced Functions Overview Application exampleType Parameter Address Format Read/write For the MM2, we haveParameter User map data Address Modbus user map setupMM2 meter user map setting System configuration System configurationDB9 pin Description Setup Software Starting Configuration WizardModbus network properties Selecting the SUB-NETWORK PropertiesParameters configured for Pqmii 11 Connect devices to sub-network Connect Devices to the SUB- Network14 Select parameter window Select Parameters for Each Node17 Configuration report Queries 20 Save device file21 Expanding the tree 23 Changing configuration parameters for a query 25 Opening a saved configuration file Profibus network setup Release Dates WarrantyMiscellaneous Revision history10-2 6-3 P485 Modbus to Profibus Converter IndexPower Supply