G7F-RD2A

Description

4-channel RTD input module for MASTER-K120S; accepts Pt100 or JPt100 RTDs and returns signed 14-bit digital temperature data with burn-out detection and ±0.2% FS accuracy.

The Polar Energy Assessment:

The G7F-RD2A converts up to four RTD temperature sensors (Pt100 or JPt100) into signed digital values for direct use in control logic or PID loops on MASTER-K120S PLCs. It supports 2-, 3-, and 4-wire RTD wiring, provides burn-out detection per channel, and stores temperature as 10× the real value (one decimal digit preserved). The module offers photo-coupler isolation to the PLC power supply and an accuracy of ±0.2% full scale, making it suitable for precise process and HVAC temperature monitoring.

Pros

• ±0.2% FS accuracy and signed 14-bit conversion for precise temperature control.
• Channel-level burn-out/disconnection detection to speed troubleshooting.
• Flexible 2/3/4-wire RTD support for messy field installs.

Limitations

• No per-channel galvanic isolation; channels share the isolation boundary to PLC power.
• Requires external 24 VDC power and correct wiring practices for wire-resistance compensation.

Typical use cases

• Chiller temperature sensors, AHU coil sensors, boiler/metering RTDs, and process control temperature feedback where accurate RTD readings and burnout detection are required.