The YOKOGAWA AMM25T, also cataloged as the AMM25T Analog Input Module, operates as a dedicated hardware component for high-density signal acquisition and conversion within CENTUM VP and ProSafe-RS Distributed Control System platforms.
| Parameter | Specification |
|---|---|
| Model | AMM25T |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 0.3 kg |
| Dimensions | 150 mm x 20 mm x 100 mm |
| Operating Temp | -10 deg C to +55 deg C |
| Power Consumption | 8 W |
| Number of Channels | 32 isolated inputs |
| Input Signals | 4-20 mA DC, 1-5 V DC |
| Accuracy | +/- 0.1 % of span |
The AMM25T facilitates signal acquisition through a high-density architecture supporting 32 independent channels. Each channel provides robust channel-to-channel isolation, preventing electrical noise propagation between field loops and ensuring the integrity of the 4-20 mA HART loop protocol implementation. The module performs high-resolution 16-bit analog-to-digital conversion, mapping field inputs to the control system with a 10 ms per channel conversion time. Built-in diagnostic routines continuously monitor for overcurrent conditions and reverse wiring states, reporting status directly to the controller backplane to maintain the operational state of the I/O subsystem.
Q: Does the AMM25T module support hot-swapping during active system operation?
A: Yes, the module supports hot-swapping capability. When replacing a module, ensure the system software has been commanded to ignore input data from the slot to prevent transient diagnostic errors from triggering false alarms in the control logic.
Q: How is the isolation voltage maintained across the module?
A: The module utilizes galvanic isolation to provide a 1500 V AC barrier for 1 minute between channels and between the channel and the system backplane. This prevents ground loops and protects the control bus from high-voltage transients on the field side.
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