1. Product Overview

2. Main Features

• 8 fully isolated RTD input channels

• Support standard RTD types: PT100, PT200, PT500, PT1000, Cu50, Cu100

• Support 2-wire, 3-wire and 4-wire connection modes

• 16-bit high resolution, excellent measurement linearity

• Built-in high-precision constant current source, low temperature drift

• 1500 VDC isolation between field side and internal circuit

• Software configurable sensor type, wiring mode, measuring range and digital filter

• Integrated fault diagnosis: open circuit, short circuit and over-limit detection

• Industrial wide temperature design, long-term stable operation

• Standard 35 mm DIN rail mounting, compact and easy installation

• Comply with industrial EMC anti-interference standard

3. Technical Specifications

3.1 General Parameters

3.2 RTD Input Specifications

3.3 Communication & Diagnosis

4. Safety Precautions

1. Installation, wiring and maintenance must be operated by qualified professional technicians.

2. Disconnect all power before wiring, disassembly or module replacement to avoid electric shock and module damage.

3. Do not install in flammable, explosive, dusty or corrosive environment without explosion-proof certification.

4. Use shielded twisted-pair cables for RTD signal wiring; separate signal cables from power cables.

5. The shield layer of signal cable shall be grounded at single end to avoid circulating current interference.

6. Strictly follow 2-wire / 3-wire / 4-wire standard wiring; wrong connection will cause large measurement error.

7. Do not input over-limit resistance or voltage to each channel.

8. Do not disassemble or modify the internal circuit structure without official authorization.

5. Installation and Terminal Definition

5.1 DIN Rail Installation

1. Fix 35 mm standard DIN rail firmly on the installation panel.

2. Hook the upper buckle of the module onto the DIN rail edge.

3. Press downward until the bottom lock snaps tightly.

4. Shake slightly to confirm firm installation without looseness.

5.2 Terminal Pin Assignment

5.3 Wiring Instructions

1. Strip about 6 mm insulation of wire ends, insert into corresponding terminals and tighten screws moderately.

2. 2-wire RTD: connect two lines to terminal A and B, terminal C empty.

3. 3-wire RTD: three lines connect to A, B, C respectively.

4. 4-wire RTD: follow standard 4-wire distribution to A, B, C terminals as defined.

5. Use shielded twisted-pair cable for long-distance transmission, single-end grounding for shielding layer.

6. Avoid routing signal cables parallel with high-voltage AC power lines to reduce interference.

6. Parameter Configuration

1. Add 12P1732X042 module in DCS / PLC configuration software.

2. Set module address, rack and slot number according to actual hardware position.

3. Configure each channel parameters:

   • Select RTD sensor type

   • Choose 2-wire / 3-wire / 4-wire wiring mode

   • Set temperature engineering range and unit (℃ / ℉)

   • Adjust digital filter time constant

   • Enable open circuit and short circuit fault alarm

4. Download configuration to controller and module.

5. Check real-time temperature value to verify normal measurement.

7. Operation Description

7.1 Power-on Self-test

7.2 Main Functions

• Accurately collect resistance signal from field RTD sensors.

• Automatically convert resistance value to standard temperature value.

• Complete line resistance compensation, digital filtering and linear processing internally.

• Upload temperature data to DCS / PLC system in real time.

• Realize channel fault detection and alarm uploading.

• Accept remote parameter configuration to adapt to different sensor types.

7.3 Indicator Description

8. Daily Maintenance

1. Regularly check terminal tightness, oxidation and corrosion condition.

2. Clean module surface dust with dry soft cloth only, no liquid or chemical solvent.

3. Keep ambient temperature and humidity within specified range.

4. Periodically inspect signal cables for aging and poor contact, replace in time if damaged.

5. Regular calibration with standard resistance box is recommended to ensure measurement accuracy.

9. Troubleshooting

1. Power indicator not on

   Cause: No 24VDC input, reverse polarity or broken power wire

   Solution: Check power supply and correct wiring polarity
2. Module cannot be recognized by system

   Cause: Wrong address setting, loose backplane contact

   Solution: Confirm module address, re-install and lock the module
3. Temperature value unstable or jumping

   Cause: Loose wiring, no shielding or strong electromagnetic interference

   Solution: Fasten terminals, use shielded cable and single-end grounding
4. Large temperature measurement deviation

   Cause: Wrong RTD type or wrong wiring mode configuration

   Solution: Re-select sensor type and match 2/3/4-wire mode
5. Channel open circuit alarm

   Cause: RTD sensor damaged or signal wire broken

   Solution: Check field sensor and wiring connection

10. Warranty Statement