900B16-0001 Honeywell 16-Channel Analog Output Module

The Honeywell 900B16-0001, also cataloged as the 900B16 Analog Output Module, operates as a dedicated hardware component for direct current loop driving and analog actuator signal generation within ControlEdge HC900 system racks.

Hardware Specifications

Process Control & Channel Isolation Characteristics

The output circuitry provides channel-to-channel isolation configured across four distinct channel banks to prevent common-mode ground loop current propagation. Standard 4-20 mA HART loop protocol compatibility allows transparent transmission of control signals to field positioners and control valves. Integrated digital-to-analog conversion stages operate with hardware fail-safe holding circuitry that maintains user-defined output current levels upon detection of backplane communication faults.

Frequently Asked Questions

Q: What happens to the analog outputs if communication with the HC900 rack CPU is lost?

A: Each channel transitions to a user-configured fail-safe state, holding either its last valid output value or driving to a pre-defined safety current limit.

Q: How is galvanic isolation allocated across the terminal connections on this module?

A: The board features 500 VDC field-to-logic isolation as well as 500 VDC group-to-group isolation divided into four isolated groups of four output channels each.

Q: What is the maximum load impedance allowed for driving 4-20 mA loop devices?

A: Individual output channels drive loop impedances up to 750 ohms while maintaining full ±0.1% full-scale precision.

Field Installation Guidelines

1. Power down the controller rack backplane and external loop power supplies before inserting or removing the output card.
2. Align module circuit board edges with chassis guide slots and push firmly until top and bottom retention latches engage fully.
3. Terminate signal wiring to the matching terminal block using twisted-pair shielded cable with individual pair drain wires terminated at cabinet earth ground.
4. Verify external field power supply output stays within the 18 to 36 VDC operating window under full 700 mA channel loading.
5. Ensure field cable routing maintains separation from 120/230 VAC power conduits to prevent electromagnetic signal coupling.