Yokogawa AMM52T Output Multiplexer Module

Hardware Specifications

4-20 mA Process Control Signal Handling

The Yokogawa AMM52T is designed for analog current output multiplexing applications within CENTUM CS series control systems. The module provides sixteen-channel 4-20 mA DC output capability for connection to 2-wire transmitters.

The output paths do not provide electrical isolation between the system side and field side or between individual channels. Installation design must consider field wiring separation, grounding practice, and signal loop protection according to the control system engineering requirements.

For Yokogawa DCS installations, current loop characteristics such as 4-20 mA HART loop protocol compatibility, channel-to-channel isolation requirements, and field instrument loop impedance must be evaluated at the system configuration level because the AMM52T itself does not include isolation functions.

Frequently Asked Questions (FAQ)

Q: Does the AMM52T provide isolation between output channels?
A: No. The AMM52T does not provide isolation between channels or between the system and field circuits.

Q: How many analog output signals can the AMM52T handle?
A: The AMM52T can output up to sixteen 4-20 mA DC signals to 2-wire transmitters.

Q: How is the AMM52T installed in the control system?
A: The module is installed in the I/O module nest and connected to the I/O module nest terminals using M4 screws.

Field Installation Guidelines

• Install the AMM52T only in the designated Yokogawa I/O module nest location specified by the CENTUM CS system configuration.
• Verify terminal assignments before connecting field current loops to prevent incorrect channel wiring.
• Maintain proper separation between analog signal wiring and high-voltage power cables to reduce electromagnetic interference.
• Follow site grounding and shielding practices for 4-20 mA field circuits, especially where long cable runs are used.
• Confirm that connected field devices match the required 2-wire transmitter output characteristics before commissioning.
• Because the module has no channel-to-channel isolation, review loop grounding arrangements to avoid unintended current paths between connected devices.