YOKOGAWA AMN12T S2 RTD Input Multiplexer Module

The YOKOGAWA AMN12T S2, also cataloged as the AMN12T RTD Input Multiplexer Module, operates as a dedicated hardware component for temperature sensor signal routing within PLC and DCS control networks.

Hardware Specifications

Cold Junction Compensation and RTD Signal Conditioning

The AMN12T S2 integrates high-density analog multiplexing logic to consolidate 12 resistance temperature detector (RTD) channels into a single measurement interface. Internal cold junction compensation (CJC) processing and channel-to-channel signal conditioning circuits suppress noise across multi-point sensor networks. Built-in burnout detection monitoring continuously evaluates loop continuity to trigger alarm states upon detecting open sensor circuits or wiring failures.

Frequently Asked Questions

Q: How does the AMN12T S2 module consolidate field wiring?

A: The module routes 12 individual RTD sensor inputs through an internal switching matrix into a single PLC input channel, reducing terminal block footprint and cabinet cabling requirements.

Q: What action does the module take during an RTD sensor failure?

A: Integrated burnout detection circuits monitor circuit continuity across all 12 channels. When an open circuit occurs, the module generates a fault signal to the host controller to indicate sensor failure.

Q: What cable shield grounding guidelines apply to the RTD input channels?

A: Individually shielded twisted-pair cables must be used for all RTD connections, with cable shields terminated at a single ground point on the cabinet earth bar to prevent ground loops.

Field Installation Guidelines

De-energize field loops and rack power before installing or removing the AMN12T S2 module. Mount the assembly securely on the designated DIN rail or rack location, verifying that mechanical retention clips lock completely. Strip conductor ends to the specified length and torque terminal block screws according to enclosure specifications. Route low-voltage RTD wiring separately from high-voltage power conduits to minimize electromagnetic interference.