ABB HAC807B101 3BHE039221R0101 S800 I/O Analog Input Termination Unit

The ABB HAC807B101, also cataloged as the 3BHE039221R0101 Analog Input Termination Unit, operates as a dedicated hardware component for high-precision sensor signal acquisition and conditioning within ABB AC 800M and S800 I/O network platforms.

Hardware Specifications

Backplane Bus Communication and Deterministic I/O Processing

The ABB HAC807B101 termination unit interfaces directly with the S800 I/O module bus structure to maintain high-speed, deterministic updates across the AC 800M controller backplane. Embedded analog-to-digital conversion circuitry processes signal channels at a conversion rate of ~500 us per channel, minimizing system scan latency. Channel-to-channel and channel-to-system electrical separation via 500 VDC galvanic isolation prevents ground loops and suppresses high-frequency noise interference, maintaining signal integrity across dense field wiring networks. Firmware compatibility within the S800 baseboard architecture ensures seamless scaling of I/O density while preserving process cycle timing under heavy control loop loads.

Frequently Asked Questions

Q: What are the input impedance characteristics when switching between voltage and current loop modes?

A: In voltage measurement configuration (0-10 V, +/-10 V, 0-5 V, +/-2.5 V, +/-5 V), the channel input resistance exceeds 1 M ohm to minimize signal loading. When configured for current loops (0-20 mA, 4-20 mA), internal termination circuitry presents a nominal input impedance of ~250 ohm.

Q: How does the unit protect against field wiring overvoltage faults?

A: The module incorporates integrated overvoltage protection circuits capable of clamping continuous field overvoltage conditions up to 30 VDC without damaging internal backplane communications or adjacent channel electronics.

Field Installation Guidelines

• DIN-Rail Mounting and Mechanical Securing: Mount the unit strictly on grounded DIN rails within an IP54 or better protective industrial enclosure. Verify that the plastic backplane retention latches fully engage with the S800 terminal base to avoid intermittent pin connection during thermal expansion or vibration.
• Shielding and Ground Bonding: Connect all analog field cable shields directly to the designated low-impedance ground bar at the cabinet entry point. Do not ground the cable shield at both ends to prevent ground potential differences from introducing measurement noise into 4-20 mA or RTD circuits.
• Wiring Separation: Route low-voltage analog signal cables (voltage, current, RTD) in dedicated, isolated cable trays at a minimum distance of 200 mm from high-voltage AC power distribution lines and motor drive outputs.
• Temperature Sensor Considerations: When connecting 2-wire or 3-wire RTDs (Pt100, Pt1000, Ni1000), ensure all lead resistances are matched within 0.1 ohm to preserve calibrated 0.1 deg C temperature measurement resolution.