YOKOGAWA AMM31 Analog Input Module

Configured for 16-channel isolated current signal acquisition in CENTUM VP and CENTUM CS 3000 systems, the YOKOGAWA AMM31 (AMM31 Analog Input Module) provides direct physical/electrical execution.

Hardware Specifications

Channel-to-Channel Isolation & 4-20 mA HART Loop Protocol Execution

The module integrates dedicated transformers and optocouplers across all 16 input paths to establish full galvanic channel-to-channel isolation. This decoupled layout blocks high common-mode voltage spikes and eliminates ground potential loops between field transmitters and system backplane logic. Furthermore, the analog input stages pass 4-20 mA HART loop protocol signals through to the system bus without introducing phase distortion, enabling continuous real-time diagnostic communications with field instruments.

Frequently Asked Questions

Q: Does the AMM31 card support hot-swapping during live system execution?

A: Yes. You can remove or install the module under power within an active CENTUM rack without disrupting backplane communications or power delivery to adjacent I/O cards.

Q: How does individual channel isolation protect the module if one field loop shorts out?

A: Internal galvanic barriers isolate the shorted loop to its specific terminal set, preventing current surges from propagating into adjacent processing channels or damaging backplane circuitry.

Field Installation Guidelines

Ensure external field loop power supply feeds are de-energized prior to seating the module into the base rack slot. Align the circuit board card edges with the enclosure slot guides and slide the assembly inward until the retaining latches click into place.

For instrument loop cabling and panel assembly:

1. Strip transmitter field wiring to 7 mm and secure the conductors into the corresponding terminal block points.
2. Route 4-20 mA analog input wiring through dedicated low-voltage instrument raceways separate from AC motor power cables.
3. Terminate signal cable shield drain wires at a single grounding point on the main enclosure copper ground busbar to prevent noise pickup.
4. Check all terminal screw retention torques to maintain low-resistance signal contacts and avoid thermal hotspots during continuous 20 mA loop operation.