FOXBORO AD908AC Thermocouple/mV Input Module Cable

Overview

The Foxboro AD908AC is a high-performance digital control system (DCS) module engineered for industrial automation, primarily utilized within the legacy Invensys Foxboro I/A Series architecture. It functions as a specialized input/output processor or interface cable component linked closely with Field Bus Modules like the FBM202.

About FBM202

The FBM202 Thermocouple/mV Input contains eight thermocouple input channels, and one isolated RTD reference junction compensation channel (for terminal temperature sensing). Each thermocouple/mV channel accepts standard thermocouples for various temperature ranges, and each provides thermocouple burnout detection (up-scale). The inputs are galvanically isolated from other channels and ground.

The module performs the signal conversion required to interface the electrical input signals from the field sensors to the optionally redundant Fieldbus. It executes an Analog Input application program, which provides integration time and Rate of Change Limits configurable options.

Two types of passive termination assemblies (TAs) are available for the FBM202:

l DIN rail mounted TAs, similar to those used with the other 200 Series FBMs

l Baseplate-mounted TA, which mounts directly onto the field I/O connectors of the 200 Series baseplate. These TAs provide field I/O wiring support for two FBM202s in paired slots (that is, in positions 1 and 2, 3 and 4, 5 and 6, or 7 and 8), as shown in Figure 1.

Figure 1 - Baseplate Mounted Termination Assembly

When connected to the appropriate TAs, the FBM202 module provides functionality formerly provided by the 100 Series Fieldbus Modules (FBMs) I/O subsystem.

Features

l 8 channels for thermocouple input signals

l 1 isolated RTD reference junction compensation channel (for terminal temperature sensing)

l Each input channel is galvanically isolated

l Rugged design suitable for enclosure in Class G3 (harsh) environments

l Execution of an analog input application program that provides conversion time and configurable options for Rate of Change Limits

l High accuracy achieved by sigma-delta data conversions for each channel

l TAs for locally or remotely connecting field wiring to the FBM202

Standard Design

FBM202 has a rugged extruded aluminum exterior for physical protection of the circuits. Enclosures specially designed for mounting the FBMs can provide various levels of environmental protection, up to harsh environments, per ISA Standard S71.04.

High Accuracy

For high accuracy, the module incorporates Sigma-Delta data conversion on a perchannel basis, which can provide new analog input readings every 25 ms, and a configurable integration period to remove any process noise and power line frequencies. Each time period, the FBM converts each analog input to a digital value, averages these values over the time period and provides the averaged value to the controller.

Dimensions - Nominal

FAQ

1. What distinguishing capabilities make the Foxboro AD908AC an effective analog input module for high-integrity process automation?
The Foxboro AD908AC provides precise analog signal acquisition with isolated input channels, dependable Fieldbus communication, and stable performance for demanding industrial control applications.

2. How does the Foxboro AD908AC optimize measurement fidelity in mission-critical process control systems?
The Foxboro AD908AC delivers high-accuracy analog input processing, ensuring reliable data collection while minimizing signal distortion and maintaining consistent process visibility.

3. Why is the Foxboro AD908AC well suited for integration into redundant Foxboro I/A Series architectures?
The Foxboro AD908AC supports redundant Fieldbus communication and is engineered for seamless compatibility with Foxboro distributed control systems, improving system availability and operational continuity.

4. Which environmental characteristics enable the Foxboro AD908AC to perform reliably in industrial installations?
The Foxboro AD908AC is designed to operate across a broad industrial temperature and humidity range, providing dependable performance in challenging process environments.

5. How should engineers evaluate compatibility when implementing the Foxboro AD908AC in a control system upgrade or expansion?
Before installing the Foxboro AD908AC, engineers should verify compatibility with the corresponding FBM baseplate, termination assemblies, power requirements, and system configuration to ensure optimal long-term performance.

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