4-20mA & RS485 Modbus Integration Guide

Category：System integration

Power, analog scaling, RS485 bus, address and communication checks for PLC, DCS and SCADA integration.

Analog output

Confirm the instrument output range, PLC/DCS input type, loop supply and load. Match engineering-unit limits to the 4-20mA scaling.

RS485 Modbus

Align address, baud rate, data bits, parity and register map. Use a suitable bus topology and configure shielding, grounding and termination for the site.

Commissioning records

Verify real-time value, temperature, status word, alarms and fault codes separately, and record instrument value, host value and timestamp.