Product Overview
The Westinghouse 1C31222G01, used together with its dedicated termination base 5A26458G05, is a high-performance Fast HART analog output (AO) module purpose-built for the Westinghouse (now Emerson) Ovation™ distributed control system (DCS). It forms the critical final link between Ovation controller logic and field final control elements: the module converts digital control commands into accurate 4–20 mA current signals that drive control valves, smart valve positioners, variable-frequency drives, dampers, and other actuators. Its “Fast” designation denotes an optimised update rate, making it suitable for demanding closed-loop applications where output latency directly affects control stability and loop performance.
A key strength of the 1C31222G01 is that it is not merely a “blind” current source. Through the associated 5A26458G05 termination base, HART digital communication is superimposed onto the same 4–20 mA loop without interrupting the analog control signal. This enables bidirectional communication with HART-capable field instruments at the Ovation engineering workstation—remote configuration, calibration, and access to device diagnostics such as valve travel, friction, cycle count, and alarm status are all possible without taking the loop out of service or using a handheld communicator. In effect, the 1C31222G01 / 5A26458G05 pair makes every output channel both a precise actuator drive and an intelligent asset-management node.
The module provides eight independently configurable output channels with 16-bit D/A conversion, ±0.1% accuracy, channel-to-channel and channel-to-backplane isolation, and per-channel fusing with transient-voltage suppression. Together with a typical 8 ms full-channel refresh rate and Ovation I/O rack hot-swap capability, the Westinghouse 1C31222G01 delivers the speed, precision, and availability required by critical power, oil and gas, chemical, and heavy-industrial applications.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model (Module) | 1C31222G01 |
| Product Model (Termination Base) | 5A26458G05 |
| Manufacturer | Westinghouse (now Emerson Automation Solutions) |
| Product Type | Fast HART Analog Output Module (with Terminal Base) |
| System Compatibility | Emerson Westinghouse Ovation™ DCS |
| Output Channels | 8 channels, independently configurable |
| Output Signal | 4–20 mA standard (software-configurable to 0–20 mA) |
| Load Capacity | 750 Ω maximum at 24 VDC |
| D/A Resolution | 16-bit |
| Output Accuracy | ±0.1% of span (or ±1 digit) |
| Refresh / Update Rate | Typical 8 ms full-channel update (<10 ms) |
| HART Support | HART 5.0 / 6.0 / 7.0 compliant; digital communication superimposed on 4–20 mA |
| Isolation | 500 VDC channel-to-channel and channel-to-backplane |
| Backplane Supply | 24 VDC (via termination base) |
| Protection | Per-channel fuse plus TVS transient suppression; short-circuit on one channel does not affect others |
| Mounting | Ovation standard I/O rack / terminal base, hot-swappable |
| Operating Temperature | 0 °C to +60 °C (control cabinet installation) |
| Humidity | 5 – 95 % RH, non-condensing |
| Protection Rating | IP20 (cabinet installation) |
| Diagnostics | Onboard status indication, open-circuit detection, HART communication status |
| Lifecycle Status | Discontinued; available as new surplus / tested surplus stock |
| Warranty | 12 months (tested-supply warranty) |
