Overview
Configured for 16-channel 4-20 mA signal termination in Honeywell DCS I/O systems, the Honeywell MC-GHAO11 51309540-175 (MC-GHAO11 Analog Output Module) provides direct electrical output interfacing between the control system and field circuits.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | MC-GHAO11 51309540-175 |
| Brand | Honeywell |
| Product Type | Analog Output Field Termination Assembly |
| Origin | USA |
| Shipment Location | Xiamen, China |
| Weight | 2 kg |
| Dimensions | 30.7 x 12.4 x 12.5 cm estimated shipping size |
| Output Type | 4-20 mA |
| Output Channels | 16 |
| Output Readback Accuracy | +/- 4% |
| Output Current Linearity | +/- 0.05% nominal |
| Resolution | +/- 0.05% |
| Directly Settable Output Current Range | 0 mA, 2.9 mA to 21.1 mA |
| Output Ripple | 100 mV peak-to-peak at power line frequency |
| Absolute Maximum Current Output | 24 mA |
| Failover Output Gap at 0 mA | 20 ms maximum |
| Switching Hardware Diagnostic Frequency | Once per minute |
Honeywell Process Control Signal Characteristics
The MC-GHAO11 provides 16 analog output channels for 4-20 mA field signal transmission. Each channel supports a directly settable output range from 0 mA through 21.1 mA, with a specified absolute maximum output of 24 mA.
The supplied specifications also define +/- 0.05% nominal output current linearity and +/- 0.05% resolution. Therefore, these values describe the electrical output characteristics rather than a general system-level accuracy claim.
During failover, the specified output gap at 0 mA is 20 ms maximum. The switching hardware performs diagnostics once per minute, providing a defined diagnostic interval for the termination hardware.
For process instrumentation, the 4-20 mA interface can form part of a conventional DCS analog output loop. However, the supplied data does not specify HART communication, channel-to-channel isolation, loop power capability, or intrinsic safety certification, so these features should not be assumed.
Frequently Asked Questions
Q: How many analog output channels does the MC-GHAO11 provide?
A: The MC-GHAO11 provides 16 analog output channels, with a nominal 4-20 mA output type.
Q: What is the maximum specified output current?
A: The absolute maximum current output is 24 mA.
Q: What failover timing is specified for the output?
A: The specified gap at 0 mA during failover is 20 ms maximum.
Field Installation Guidelines
- Verify the complete part number 51309540-175 before installation and match it with the approved system documentation.
- Confirm terminal assignments before connecting any 4-20 mA field circuit.
- Route analog signal wiring separately from high-voltage power conductors and high-current switching circuits.
- Use appropriate shielded instrumentation cable where the installation design requires noise control.
- Terminate cable shields according to the plant grounding specification rather than creating unintended ground loops.
- Check field-loop polarity and wiring continuity before applying output power.
- Verify that the connected field device can accept the configured output current range.
- Do not exceed the specified 24 mA absolute maximum output current.
- After installation, verify each channel’s commanded output and corresponding field-side measurement.
- Confirm failover behavior and diagnostic status against the approved Honeywell system configuration before placing the channel into service.
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