Vega VEGAPULS 61 Operating Instructions Manual

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Vega VEGAPULS 61 Operating Instructions Manual Manual pdf 73 page image

7310 SupplementVEGAPULS 61 • Modbus and Levelmaster protocol41717-EN-160224Power consumption < 500 mWReverse voltage protection IntegratedElectrical protective measuresProtection ratingHousing material Version IP-protection class NEMA protectionPlastic Single chamber IP 66/IP 67 NEMA 4XDouble chamber IP 66/IP 67 NEMA 4XAluminium Single chamber IP 66/IP 68 (0.2 bar)IP 68 (1 bar)NEMA 6PNEMA 6PDouble chamber IP 66/IP 67IP 66/IP 68 (0.2 bar)IP 68 (1 bar)NEMA 4XNEMA 6PNEMA 6PStainless steel, electro-polishedSingle chamber IP 66/IP 68 (0.2 bar) NEMA 6PStainless steel, precisioncastingSingle chamber IP 66/IP 68 (0.2 bar)IP 68 (1 bar)NEMA 6PNEMA 6PDouble chamber IP 66/IP 67IP 66/IP 68 (0.2 bar)IP 68 (1 bar)NEMA 4XNEMA 6PNEMA 6PProtection rating (IEC 61010-1) IIIApprovalsInstruments with approvals can have different technical specifications depending on the version.For that reason the associated approval documents of these instruments have to be carefullynoted. They are part of the delivery or can be downloaded under www.vega.com, "VEGA Tools"and "Instrument search" as well as in the download area.10.2 Basics ModbusBus descriptionThe Modbus protocol is a communication protocol for the communication between instruments. It isbased on a Master/Slave or Client/Server architecture. By means of Modbus, a Master and severalSlaves can be connected. Each bus participant has an unambiguous address and can send mes-sages to the bus. This is initiated by the Master, the addessed Slave answers. For data transfer, theversions serial (EIA-485) as well as the mode RTU are available. In the RTU and ASCII mode inter-esting here, data will be transmitted in binary form. The telegram consists generally of the address,the function, the data as well as the transmission check.Bus architectureIn the version Modbus RTU, up to 32 participants can be connected to the bus. The length of thetwisted two-wire cable can be up to 1200 m. The bus must be terminated on both sides at the lastbus participant with a terminating resistor of 120 Ohm. The resistor is already integrated in theVEGAPULS 61 and is activated/deactivated via a slide switch.