PLCs, Power Supplies & Others

Signal Acquisition Overview

The Yokogawa AMM22M serves as a versatile analog input multiplexer for the CENTUM CS and VP distributed control platforms. This module accepts a wide range of analog signals from field instruments and transmitters. It performs high-speed scanning with excellent measurement accuracy. Industrial facilities depend on this module for comprehensive process data collection.

Technical Specifications

The AMM22M measures 128 mm in height and 33 mm in width. Its compact design allows dense installation in Yokogawa I/O racks. The module weighs approximately 0.25 kilograms. It draws 440 mA from the +5V DC and 48 mA from the ±15V DC supplies.

Multi-Range Input Versatility

The Yokogawa AMM22M handles voltage, current, and millivolt signals on the same module. Each channel allows independent configuration for the required input type. A precision programmable gain amplifier scales each signal optimally. A shunt resistor array provides termination for current inputs. The module includes a precision voltage reference for accurate conversions. This flexibility reduces the need for multiple dedicated modules.

Scanning Architecture and Performance

This multiplexer scans all sixteen channels with a cycle time of 85 microseconds per channel. Two multiplexer ICs manage the switching with minimal crosstalk. The module achieves 100 dB of common mode rejection for noisy environments. A 33 μF tantalum capacitor stabilizes the internal supply rails. The module includes input filtering to eliminate high-frequency noise. This filtering ensures clean measurements from industrial sensors.

Connectivity and System Integration

Installing the AMM22M requires one slot in the Yokogawa I/O rack. The 50-pin ribbon connector handles all field wiring terminations. A green LED indicates normal power and a yellow LED shows active scanning. The module exchanges data with the field control unit via the backplane bus. It operates reliably between 0°C and 50°C ambient temperatures. Proper cable management reduces measurement errors.

Reliability and Diagnostics

The Yokogawa AMM22M delivers robust performance for continuous process monitoring. The module stores calibration parameters in non-volatile memory. It performs self-diagnostics on power-up and during operation. Regular verification against known signal sources confirms accuracy. The solid-state design provides long-term reliability without moving parts.

Details