Honeywell 900B08-0202 Analog Output Module

Honeywell 900B08-0202 Analog Output Module

The 900B08-0202 is an 8-channel analog output module developed by Honeywell for the HC900 process automation controller platform. It provides precision control signals ranging from 0 to 21 mA across isolated channel groups, designed for driving actuators, valves, and final control elements in industrial automation loops.

Channel Architecture and Isolation

The module features 8 independent output channels divided into two isolated groups of 4 channels each (channels 1-4 and channels 5-8). Galvanic isolation rated at 500 VDC separates the two channel groups from each other as well as from the internal logic circuitry, protecting system electronics from ground loops and common-mode electrical transients.

Precision Control and Output Verification

Delivering a D/A resolution of 13+ bits (1 part in 13332) with a full-scale accuracy of 0.1% under reference conditions, the unit supports selectable output ranges up to 21.0 mA into a maximum load resistance of 750 ohms. Built-in output verification routes feedback signals back to the controller to confirm that output current is actively flowing, complemented by diagnostic routines that monitor factory calibration, field calibration, and module configuration.

Power Requirements and Physical Installation

Powered through the system backplane, the module draws a maximum of 225 mA from the 5 V rail and 350 mA from the 24 V rail, allowing up to 4 modules per rack when relying on internal backplane power. Field wiring terminates at a 36-position Euro-style terminal block (Model 900TCK0001). The physical assembly measures 137 mm in height by 35.6 mm in width (5.4 in x 1.4 in) and weighs approximately 0.4 kg.

Frequently Asked Questions

Q: How are the 8 output channels electrically arranged on this module? A: The 8 channels are divided into two isolated groups of 4 channels (channels 1-4 and channels 5-8) with 500 VDC galvanic isolation between groups and logic.

Q: What is the maximum load resistance supported by the outputs? A: The module supports a maximum load resistance of 750 ohms across its 0 to 21.0 mA operating range.

Q: How many 900B08-0202 modules can be powered by a single HC900 rack? A: Up to 4 modules can be installed per rack when powered entirely from the internal 24V backplane power supply.