Yokogawa AMM22C mV Input Multiplexer Module

Hardware Specifications

Process Instrument Signal Handling and DCS Interface

The AMM22C provides multiplexed analog input acquisition for Yokogawa CENTUM CS series control systems. Each module accepts up to 16 measurement points, with input type selection configurable per channel for DC voltage, millivolt, thermocouple, and RTD signals.

The module architecture supports process measurement integration through DCS I/O module nests. Channel-to-channel isolation design considerations are applied in analog signal handling to reduce measurement interference between individual input points.

For thermocouple applications, cold junction compensation (CJC) functions are handled according to the associated Yokogawa I/O configuration and system specifications. Proper sensor wiring, shield termination, and grounding practices are required to maintain measurement accuracy.

Frequently Asked Questions

Q: What input signals can the Yokogawa AMM22C accept?
A: The AMM22C accepts DC voltage, mV, thermocouple, and RTD measurement inputs. The input type can be specified for each measurement point.

Q: How many measurement points are supported by the AMM22C?
A: The module supports up to 16 input channels through its multiplexer configuration.

Q: Which Yokogawa systems are compatible with the AMM22C?
A: The AMM22C is specified for use with Yokogawa CENTUM CS 3000 and CENTUM CS 1000 systems.

Field Installation Guidelines

• Install the module in the designated Yokogawa I/O module nest according to the applicable CENTUM CS system hardware configuration.
• Verify connector seating and mechanical alignment before system power application.
• Use shielded instrumentation cables for low-level mV, thermocouple, and RTD signal wiring.
• Connect cable shields according to the site grounding standard to minimize electromagnetic interference.
• Separate analog measurement wiring from high-voltage and high-current power cables.
• Confirm channel configuration parameters in the DCS engineering database before commissioning field inputs.
• Inspect terminal connections and signal polarity during maintenance activities.