M.J.Saleh Posted October 8, 2006 Report Posted October 8, 2006 Hi I am using a Modicon PLC and tried to connect Siemens TP270 Display via Modbus interface to That PLC , But now Please tell me how much is the Standard Cable Length For Modbus Interface ? and which Convertor Modulle i must use to chang My Bus from Modbus to Modbus+ in order to increase the cable Length ? Thank you so much Quote
Crossbow Posted October 8, 2006 Report Posted October 8, 2006 The only way to get Modbus devices on Modbus Plus is with a Modicon Bridge Plus. That Bridge Plus connects Modbus serial devices to Modbus Plus network. It's not a cheap connection either, as Modbus Plus is a proprietary high speed bus (similar to AB with DH485). You're probably best leaving the interface on RS232 which typically can't be more than 15 meters. Quote
redfred1 Posted November 17, 2006 Report Posted November 17, 2006 You can always go to an RS232 to RS485 convertor to get more distance...1200 meters/4000 ft. Quote
Crossbow Posted November 17, 2006 Report Posted November 17, 2006 Depending on the PLC, there might be an RS485 Modbus option module available. That would be a good bet. Quote
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