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212 • Application examplesVisualization and control using SCADA softwareWAGO-I/O-SYSTEM 750ETHERNET TCP/IPExample of the MODBUS function codeIn the case of SCADA Software Lookout from National Instruments theMODBUS function codes are used with a 6 bit coding, whereby the first bitrepresents the function code:Input code: MODBUS function code0 FC1 Ù read coils Reading of several input bits1 FC2 Ù read input discretes Reading of several input bits3 FC3 Ù read multiple registers Reading of several input registers4 FC4 Ù read input registers Reading of an individual input registerThe following five digits specify the channel number of the consecutivelynumbered digital or analog input and/or output channels.Examples:- Read the first digital input: i.e. 0 0000 1- Read the second analog input: i.e. 3 0000 2Application example:Thus, the digital input channel 2 of the above node "Measuring data" can beread out with the input: "Measuring data. 0 0000 2".Fig. 8-1: Example of user software G012913eMore informationPlease refer to the respective SCADA product manual for a detaileddescription of the particular software operation. |
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