YOKOGAWA AAI543-H00

Technical Specifications Output Channels: 16 channels, individually galvanically isolated Output Signal Range: 4 to 20 mA DC Digital Communication: HART protocol (FSK, Bell 202, 1200/2200 Hz) superimposed on the current loop Output Accuracy: ±48 µA (±0.3% of full scale) Allowable Load Resistance: 0 to 750 Ω Circuit-Open Detection Threshold: less than 0.65 mA Data Update Period: 10 ms Withstand Voltage: 1500 V AC between output circuit and system, for 1 minute Temperature Drift: ±16 µA per 10 °C Current Consumption: 230 mA at 5 V DC (internal bus) Weight: approximately 0.4 kg

Functional Features Sixteen independently isolated output channels eliminate ground loops and crosstalk between field instruments. HART protocol support delivers remote device configuration, process variable reading, and diagnostic status without additional wiring. The 10 ms data update period supports fast control loops. Open-circuit detection reports loop faults to the FCS for immediate alarm generation. The module supports hot-swap replacement under power for minimum downtime.

Application Scenarios Continuous process control loops in oil and gas refining, petrochemical plants, power generation, water and wastewater treatment, pharmaceutical manufacturing, and pulp and paper production. The module drives control valves, variable-speed drives, I/P converters, and positioning actuators requiring HART-enabled two-way communication.

Performance Parameters Output resolution: 16-bit equivalent Linearity error: within ±0.05% of full scale Response time: 10 ms update cycle Isolation resistance: greater than 100 MΩ at 500 V DC Operating temperature: 0 to +55 °C Storage temperature: -40 to +70 °C Ambient humidity: 5 to 95% RH, non-condensing

Material Composition Flame-retardant plastic front panel meeting UL 94 V-0 rating. Printed circuit board assembled with surface-mount and through-hole components. Gold-plated backplane connector for reliable bus contact. Steel mounting bracket and EMC shielding can.

Structural Features Single-width plug-in module occupying one slot in the FIO node rack. Front panel houses status LEDs, a HART communication indicator, and a terminal interface. Internal isolation transformers and optocouplers provide channel-to-channel and channel-to-system galvanic separation. Rear connector mates with the rack backplane for power, bus communication, and I/O signals.

Working Principle The FCS transmits digital setpoint values over the ESB bus to the module. A digital-to-analog converter converts each 16-bit value into a proportional current. A precision voltage-to-current converter drives the 4 to 20 mA loop. HART FSK modulation is injected onto the loop current for digital communication. Each channel’s output is electrically isolated through dedicated DC-DC converters and signal isolators.

Installation Requirements Install the module in a Yokogawa FIO node rack (ANB10, ANR10, AFF50, AFV10, AFV30, or AFV40 series). Insert the module into an available slot and secure the front-panel retaining screw. Connect field wiring to the corresponding terminal block per the channel assignment diagram. Verify load resistance stays within 0 to 750 Ω. Ensure ambient temperature remains within 0 to +55 °C and the rack receives forced-air cooling as specified.

Usage Precautions Do not exceed the 750 Ω load limit on any output channel. Keep HART wiring away from high-voltage cables to prevent noise interference. Use shielded twisted-pair cable for all analog output loops and ground the shield at one end only. Before hot-swapping, confirm the control loop is in manual or bypass state to avoid process disturbance. Do not apply external voltage to output terminals; the module is a current source, not a passive load.