Description

Yokogawa AMM32T RTD Input Multiplexer Module

Configured for RTD signal multiplexing in Yokogawa CENTUM CS and CENTUM VP systems, the Yokogawa AMM32T (AMM32T RTD Input Multiplexer Module) provides direct physical/electrical execution for 32-channel temperature acquisition and signal conditioning. The module accepts 3-wire RTD inputs, performs linearization and multiplex conversion, and transfers conditioned process data through the Yokogawa DCS I/O infrastructure.

Suffix Breakdown & Model Matrix

Model Variant	Description
AMM32T	Standard RTD input multiplexer module
AMM32TJ	Terminal specification variation for installation configuration

Hardware Specifications

Parameter	Specification
Model	AMM32T
Brand	Yokogawa Electric Corporation
Product Type	RTD Input Multiplexer Module
Number of Channels	32 isolated RTD input channels
Supported Sensors	Pt100, Pt1000, JPt100, 3-wire RTD
Measurement Range	-200 degC to +600 degC
Measurement Accuracy	+/- 0.15 degC
Measuring Current	Approx. 1 mA
Maximum Input Resistance	>= 2 Mohm per channel
Allowable Lead Resistance	<= 150 ohm per wire
Data Update Cycle	1 second for 32 channels
Fault Detection	Burnout detection selectable Up/Down/Off
System Compatibility	CENTUM CS, CENTUM CS 3000, CENTUM VP
Power Consumption	<= 500 mA at 5 VDC
Mounting Method	Yokogawa standard I/O nest installation
Dimensions	152 mm x 76 mm x 254 mm
Weight	0.8 kg
Operating Temp	Not specified in supplied documentation
Origin	Japan

Channel-to-Channel Isolation Characteristics

The AMM32T module implements isolated RTD input processing across 32 channels to reduce common-mode interference between adjacent temperature loops. Multiplexed acquisition circuitry performs signal conditioning prior to transmission into the CENTUM backplane structure. The module supports burnout and open-circuit diagnostics for field RTD disconnection detection without requiring external line supervision hardware.

RTD measurement execution is based on low-current excitation approximately equal to 1 mA. Balanced lead resistance handling up to 150 ohm per conductor is supported for 3-wire RTD compensation stability.

Frequently Asked Questions

Q: Does the AMM32T support hot-swapping during system operation?
A: The supplied documentation does not explicitly define online insertion or removal capability. Module replacement should follow CENTUM system maintenance procedures with slot power state verification before extraction.

Q: What RTD wiring configuration is supported by the module?
A: The AMM32T supports 3-wire RTD sensor configurations including Pt100, Pt1000, and JPt100 input types.

Q: How is RTD sensor failure detected?
A: The module provides selectable burnout and disconnection detection modes. Detection behavior can be configured for upscale, downscale, or disabled response handling.

Field Installation Guidelines

• Use shielded twisted-pair RTD extension cable for all field temperature circuits.
• Terminate cable shields at a single cabinet grounding point to reduce circulating ground current.
• Maintain separation between RTD wiring and high-voltage motor or inverter cable trays.
• Verify conductor resistance balance before commissioning 3-wire RTD loops.
• Confirm slot compatibility with CENTUM CS or CENTUM VP I/O nests prior to installation.
• Avoid routing RTD input wiring adjacent to relay switching assemblies or high-current contactors.
• Inspect terminal torque conditions periodically to prevent intermittent sensor disconnection alarms.

Specifications

• Brand: Yokogawa

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems