AMM22 | Yokogawa Multiplexer Input Module for CENTUM Systems

Product Overview

The Yokogawa AMM22 is a robust multiplexer input module engineered for high-performance data acquisition within CENTUM CS and CENTUM VP distributed control systems. It is designed to efficiently handle multiple field signals—typically millivolt (mV) or thermocouple inputs—by multiplexing them into a single processing channel. This module addresses the critical need for high-density signal monitoring in space-constrained control panels, offering a 1 kHz high-speed conversion rate that ensures rapid and accurate data capture for dynamic industrial processes.

Technical Specifications

The AMM22 is built to withstand rigorous industrial environments while maintaining signal integrity.

Model Code Interpretation

Understanding the suffix logic is essential for ensuring compatibility with your specific carrier and wiring setup.

Part Number: AMM22T

AMM22-AXX

• A (Suffix -T): This suffix typically designates the Terminal Type.

• -T: Indicates that the module features screw terminals for direct field wiring. This is distinct from the "-C" (Connector) version, which requires a specific mating cable.

• Note: If your part number is AMM22M, the "M" often denotes a specific "Modified" or "Metric" version tailored for specific regional standards or carrier types.

Note: Always verify the physical interface (Terminal vs. Connector) against your control cabinet wiring to ensure a proper fit.

Installation and Wiring Guidelines

Proper installation is key to maximizing the performance of the AMM22 module.

1. Carrier Compatibility: The AMM22 is designed to mount into specific I/O carrier boxes (such as the AMN series). Ensure the module is firmly seated in the slot and the locking mechanism is engaged to maintain backplane connectivity.

2. Wiring Connections:

• Signal Inputs: For the AMM22T (Terminal type), use a screwdriver to secure the field wires. Ensure the wire gauge matches the terminal specifications to prevent loose connections.

• Thermocouple/MV: Since this module typically handles low-level signals, use shielded twisted-pair cables to minimize electromagnetic interference (EMI).

• Grounding: Connect the shield to the ground terminal at the cabinet end to prevent noise from affecting the measurement accuracy.

3. Power Supply: The module operates on a standard 24 V DC supply. Verify that the system power rail is stable and within the specified range before powering up the module.

4. Thermal Management: Ensure adequate airflow around the module. The operating temperature range is -10°C to +55°C; exceeding this limit can cause drift in the high-speed conversion accuracy.

Frequently Asked Questions (FAQ)

Q: What is the primary function of the AMM22?A: The AMM22 acts as a multiplexer, allowing the system to scan and process multiple input channels (such as thermocouples or mV signals) sequentially using a single analog-to-digital converter, which increases channel density and efficiency.

Q: What does the "1 kHz" specification mean?A: This refers to the high-speed conversion rate. The module can sample and convert input signals at a rate of 1,000 times per second, making it suitable for processes requiring faster data updates.

Q: Is the AMM22 compatible with CENTUM VP?A: Yes, the AMM22 is designed for use in both CENTUM CS and the newer CENTUM VP systems, providing a reliable migration path for control system upgrades.

Q: Can I use this module for 4-20 mA inputs?A: While the standard output signal is listed as 4-20 mA DC (referring to the internal bus communication or converted signal), the AMM22 is primarily an input module for low-level signals like mV or Thermocouples. For direct 4-20 mA input, other models like the AMM42 or AAM10 series might be more appropriate depending on the specific application.