The YOKOGAWA AMM42 is a 2-wire Transmitter Input Multiplexer Module designed for industrial automation applications.

Function:

• The AMM42 acts as a multiplexer, allowing it to combine signals from up to sixteen 4-20 mA DC current loop transmitters into a single output signal. This is useful when you have limited input channels on a controller (PLC or DCS) but need to monitor signals from multiple transmitters.

Features:

• Input Channels: Up to 16 individual channels to connect 4-20 mA DC current loop transmitters.
• Output Channel: Single output channel that transmits a multiplexed signal representing the selected transmitter data.
• Multiplexing Scheme: The specific multiplexing scheme (scanning or fixed) and channel selection method might depend on the model variant or Yokogawa system configuration.
• Data Update Rate: The update rate at which the module reads and transmits data from each channel can vary depending on the model and total number of channels. It’s typically in the range of 1-10 seconds.
• Accuracy: The module introduces minimal error in the transmitted signal compared to the original transmitter readings.
• Power Supply: The AMM42 typically receives power from the control system (PLC or DCS) and might also provide power to the connected transmitters within its allowable voltage and current limits.

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