Modbus - Overview; Communication - Siemens SITRANS L Operating Instructions Manual

Technical data and dimensions
12.2 Modbus – Overview
12 DC
24 V DC
Reverse voltage protection
Overvoltage protection
Dielectric strength against
metallic mounting parts
Overvoltage resistance (test
impulse voltages 1.2/50 µs at
42 Ω)
Additional overvoltage
arrester
Electrical protective measures
Protection rating
Altitude above sea level
Protection class
Pollution degree
12.2 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:
•
•
The data exchange between field device and host is done via registers. The input
registers only allow 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].
12.3

Communication

Register
Number
200
44
Modbus ASCII (data transmission as ASCII signs)
Modbus RTU (data transmission is binary signs)
Register Name
Address
150 mW/330 mW
240 mW/420 mW
Integrated
> 10 kV
> 1000 V
Due to the floating structure of the electronics and comprehensive
insulation measures generally not necessary.
IP66/IP68 (3 bar, 24 h) acc. to IEC 60529,Type 6P acc. to UL 50
5000 m (16404 ft)
III
4
www.modbus.org [https://
Data type Configurable Values
uint8 1 ... 255
r/w
Unit Default
Value
– 246
SITRANS LR110
Operating Instructions, 12/2020, A5E49829013