Vega VEGAFLEX 81 - Basics Modbus; Bus description

77
10 Supplement
VEGAFLEX 81 • Modbus and Levelmaster protocol
42283-EN-140430
Materials
Ʋ Housing ABS
Ʋ Inspection window Polyester foil
Integrated clock
Date format Day.Month.Year
Time format 12 h/24 h
TimezoneExfactory CET
Rate deviation max. 10.5 min/year
Measurement electronics temerature
Resolution 1 °C (1.8 °F)
Accuracy ±1 °C (1.8 °F)
Permissible temperature range -40 … +85 °C (-40 … +185 °F)
Voltage supply
Operating voltage 8 … 30 V DC
Power consumption < 500 mW
Interpolation protection Integrated
Electrical protective measures
Protection, depending on housing version
Ʋ Plastic housing IP 66/IP 67 (NEMA 4X)
Ʋ Aluminium housing, stainless steel
housing - investment casting, stain-
less steel housing - electro-polished
IP 66/IP 68 (0.2 bar), NEMA 6P
6)
Overvoltage category III
7)
Protection class III
8)
Approvals
Instrumentswithapprovalscanhavedierenttechnicalspecicationsdependingontheversion.
For that reason the associated approval documents of these instruments have to be carefully
noted. They are part of the delivery or can be downloaded under www.vega.com, "VEGATools"
and "Instrument search" as well as under www.vega.com/downloads and "Approvals".
10.2 Basics Modbus
Bus description
The Modbus protocol is a communication protocol for the communication between instruments. It is
based on a Master/Slave or Client/Server architecture. By means of Modbus, a Master and several
Slaves 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, the
6)
The prerequisites for maintaining the protection rating are a suitable cable as well as correct mounting.
7)
IEC 61010-1
8)
IEC 61010-1