49
14 Supplement
VEGAPULS C 23 • Modbus and Levelmaster protocol
58349-EN-200806
Effective range typ.
13)
25 m (82 ft)
Adjustment
PC/Notebook
PACTware/DTM
Smartphone/Tablet
Adjustment app
Voltage supply
Operating voltage
8 … 30 V DC
Power consumption without/with bus communication typ. at
Ʋ
12 DC
150 mW/330 mW
Ʋ
24 V DC
240 mW/420 mW
Reverse voltage protection
Integrated
Overvoltage protection
Dielectric strength against metallic
mounting parts
> 10 kV
Overvoltage resistance (test impulse
voltages 1.2/50 µs at 42 Ω)
> 1000 V
Additional overvoltage arrester
Due to the floating structure of the electronics and com
-
prehensive insulation measures generally not necessary.
Electrical protective measures
Potential separation
Electronics potential free up to 500 V AC
Protection rating
IP66/IP68 (3 bar, 24 h) acc. to IEC 60529,
Type 6P acc. to UL 50
Altitude above sea level
5000 m (16404 ft)
Protection class
III
Pollution degree
4
14.2 Modbus – Overview
Modbus is a bus system for connecting a host (e.g. PLC) and several slaves (e.g. field devices).
Data transmission via the Modbus communication protocol takes place in different operating
modes:
•
Modbus ASCII (data transmission as ASCII signs)
•
Modbus RTU (data transmission is binary signs)
A version of the Modbus protocol is the Levelmaster protocol.
The data exchange between field device and host is done via registers. The input registers only al
-
low read access, holding registers both read and write access.
The device supports the above mentioned points. The following shows the device-specific details
required for this.
You can find further information to Modbus on
www.modbus.org.
13)
Depending on the local conditions