ABB 3BSE017429R1 NMTU-21C RTD Temperature Input Unit

ABB NMTU-21C, part number 3BSE017429R1, is a dedicated RTD temperature input unit for ABB AC500 PLC and S800 I/O system. It is designed to connect with Pt100, Pt1000 and other thermal resistance sensors, converting resistance signals into digital temperature data and transmitting readings to the AC500 controller via the S800 internal bus.

This module delivers high-precision temperature measurement with built-in signal filtering and channel diagnostics. It adopts standard DIN rail mounting and supports side-bus cascading with other S800 I/O modules. It is widely supplied as spare replacement parts for factory automation, energy and chemical plant control cabinet maintenance and system upgrade projects.

Main Specifications

1. Brand: ABB; Model: NMTU-21C; Part No: 3BSE017429R1; Type: RTD Temperature Input Unit
2. Compatible System: AC500 PLC / S800 I/O system; Supported Sensors: Pt100, Pt1000
3. Measurement Accuracy: ±0.1°C; Channel: Multi-channel RTD acquisition
4. Communication: S800 side bus; Installation: DIN rail mount
5. Diagnostics: Per-channel fault detection, open circuit and short circuit alarm
6. Operating Temp: -25℃ ~ +60℃; Protection Class: IP20
7. Supply Status: Spare temperature input module for ABB S800 I/O rack

Core Functions

1. Collect resistance signals from RTD thermal resistance sensors and convert to accurate temperature values.
2. Transmit digital temperature data to AC500 PLC controller through S800 side bus communication.
3. Built-in digital filter suppresses field electrical interference to stabilize temperature readings.
4. Detect sensor open circuit, short circuit and channel failure, and send fault alarms to PLC.
5. Support cascading connection with other S800 I/O modules on DIN rail to expand measurement points.
6. Compact housing design for installation inside industrial control cabinets for continuous long-term operation.

Application Scenarios

1. ABB AC500 PLC automation cabinets in manufacturing, energy and chemical plants.
2. Precise temperature monitoring for pipelines, reactors, motors and furnace equipment.
3. Replacement of faulty RTD temperature input units in existing S800 I/O racks.
4. Spare parts inventory for automation maintenance teams of process industries.
5. Retrofit and temperature signal expansion of legacy AC500 PLC control systems.
6. Water treatment, food & beverage and metallurgy process temperature monitoring loops.

FAQ

1. Q: What is ABB NMTU-21C 3BSE017429R1?
   A: It is an RTD temperature input unit for ABB AC500 PLC and S800 I/O system, used for high-precision thermal resistance temperature acquisition.
2. Q: What sensors does NMTU-21C support?
   A: It supports common RTD sensors including Pt100 and Pt1000 for industrial temperature measurement.
3. Q: Can it connect with other S800 modules?
   A: Yes, it adopts S800 side bus interface, allowing cascading with NBIO-21CU and other S800 modules on DIN rail.