Yokogawa AMM22M mV Input Multiplexer Module

Hardware Specifications

Channel Isolation and Process Instrument Signal Handling

The AMM22M provides multiplexed analog input processing for low-level mV signals within Yokogawa CENTUM control system I/O structures. The module accepts measurement inputs configured individually per channel, allowing different signal types including DC voltage, millivolt signals, thermocouples, and resistance temperature sensors within the supported multiplexer architecture.

For Yokogawa process instrumentation applications, the module design incorporates channel signal separation between systems. Input signal isolation supports stable analog measurement handling where multiple field measurement points are connected through a shared I/O module arrangement.

The module architecture supports process measurement functions requiring signal integrity controls such as channel-to-channel isolation, cold junction compensation (CJC) compatibility through thermocouple input configurations, and integration with analog measurement loops used in DCS environments.

Frequently Asked Questions

Q: How many measurement inputs can the Yokogawa AMM22M process simultaneously?
A: The AMM22M supports up to 16 measurement input points. Each point can be configured for supported input signal types including mV, DC voltage, thermocouple, and RTS signals.

Q: What is the supported input range for mV measurement signals?
A: The AMM22M supports an input range of -100 to 100 mV DC with an accuracy specification of +/- 40 uV.

Q: Does the AMM22M provide electrical isolation for input signals?
A: Yes. The supplied specifications state that input signals are isolated between systems.

Field Installation Guidelines

Install the AMM22M according to the Yokogawa CENTUM system hardware configuration requirements and approved I/O module mounting procedures.

• Verify module slot compatibility within the designated CENTUM CS 3000 or CENTUM CS 1000 I/O structure before installation.
• Separate low-level mV signal wiring from high-voltage power cables and high-current switching circuits to reduce electrical interference.
• Use appropriate shielded instrumentation cables for analog signal connections where required by the site grounding design.
• Connect cable shields according to the plant grounding standard and avoid creating unintended ground loops.
• Confirm field wiring polarity and terminal assignments before applying system power.
• Check input loop continuity and sensor wiring resistance before commissioning the measurement channels.
• Verify channel configuration parameters match the connected field devices, including thermocouple and resistance temperature sensor settings.