Emerson 8102-HO-IP PAC8000 Analog Output Module

Description

Product Introduction & Engineering Value

The 8102-HO-IP converts controller commands into eight independently controlled 4–20 mA output signals while supporting HART communication to compatible field devices. That makes it suitable for control loops involving valves, positioners, current-driven actuators, and other analog process devices where digital HART access is also required.

For replacement work, the suffix matters. Emerson separately lists the 8104-AO-IP as an 8-channel 4–20 mA analog output module without the HART designation, so the 8102-HO-IP should not be replaced simply because another module has the same channel count and current range.

Technical Specifications

Emerson’s PAC8000 documentation confirms the eight-channel 4–20 mA HART function. Published technical listings additionally report the 12-bit resolution, 1–23 mA full range, 0.7 ± 0.25 mA open-loop threshold, ±0.25% span accuracy, and <0.02% span ripple.

The module is also explicitly listed in Emerson’s documentation as a supported module for the 8000 BIM System Interface, which allows AMS Device Manager to display HART field devices connected through the 8000 BIM system.

Field Application & The “Trench” Experience

A realistic failure scenario is a PAC8000-controlled process skid where one analog output drives a valve positioner. The controller logic is still functioning, but the field valve stops responding correctly because the output channel has developed a fault.

The maintenance team replaces the 8102-HO-IP, but the commissioning check cannot stop at verifying that the channel produces 4–20 mA. The engineer also needs to confirm the correct loop polarity, load resistance, output scaling, HART communication, and controller channel assignment. Otherwise, a replacement can appear electrically healthy while the process loop remains incorrectly configured.

Specific applications include:

1. Control-valve position commands — 4–20 mA output to HART-enabled valve positioners.
2. Variable-speed equipment interfaces — analog speed/reference signals to compatible drives.
3. Process-skid control loops — controller-generated analog commands for pumps, valves, and actuators.
4. HART-enabled actuator commissioning — analog control combined with digital device diagnostics and configuration.

The PAC8000 architecture is intended for process control and general automation, while Emerson’s documentation distinguishes the platform’s various I/O and hazardous-area configurations.

8102-HO-IP

8102-HO-IP

QA & Testing

For new-surplus or refurbished 8102-HO-IP inventory, a meaningful test should cover both the analog output circuit and HART functionality.

1. Identification

• Confirm 8102-HO-IP on the physical label.
• Verify the PAC8000 identification.
• Check revision and manufacturing information.
• Inspect the terminal/connector interface.

2. Analog output test

Apply the appropriate PAC8000 test configuration and verify representative output points such as:

• 4.00 mA
• 12.00 mA
• 20.00 mA

Check linearity, output stability, and response under an appropriate test load.

3. Fault detection

Test the module’s open-loop detection behavior where the test equipment permits. Emerson-related technical data specifies an open-loop detection threshold of approximately 0.7 ± 0.25 mA.

4. HART verification

Where HART-capable test equipment is available, verify communication with a compatible field device while the analog output is operating.

5. Final inspection

Record the actual module number, revision, test load, measured output values, HART test result, physical condition, and any refurbishment performed.

Veteran’s Tech Trap Guide

⚠️ Trap #1 — Confusing 8102-HO-IP with 8104-AO-IP.

Both are eight-channel 4–20 mA analog-output modules, but Emerson identifies the 8102-HO-IP as HART-capable, while the 8104-AO-IP is separately specified as an 8-channel 4–20 mA AO module.

PRO TIP: If the existing system uses HART diagnostics or device configuration, verify that the replacement specifically carries the 8102-HO-IP designation.

⚠️ Trap #2 — Confusing general-purpose and intrinsically safe versions.

The 8102-HO-IP, 8202-HO-IS, and 8302-HO-IS are not interchangeable simply because they all provide 4–20 mA HART outputs. Emerson assigns different hazardous-area classifications to these models.

⚠️ Trap #3 — Testing only current output.

A channel producing 4–20 mA does not prove that its HART function is operating correctly. For a system using HART diagnostics, test both layers.

⚠️ Trap #4 — Ignoring load compliance.

The published specification gives an example of 20 mA into a 700 Ω load at a 21.6 VDC supply. Loop resistance, field wiring, barriers, and the connected device therefore need to be considered when diagnosing an output that cannot reach its commanded value.

FAQ

What is Emerson 8102-HO-IP?

It is an 8-channel analog output module for Emerson PAC8000 Remote I/O, providing 4–20 mA outputs with HART capability.

Does the 8102-HO-IP support HART?

Yes. Emerson identifies the module as “8-channel AO, with HART for 4–20 mA.”

How many analog outputs does it provide?

It provides 8 single-ended analog output channels. Published specifications identify a nominal 4–20 mA range and a 1–23 mA full signal range.

What is the resolution?

The published technical specification identifies 12-bit resolution.

Is 8102-HO-IP intrinsically safe?

The 8102-HO-IP is identified in Emerson documentation as a Division 2/2 analog-output module. It should not be treated as equivalent to the 8202-HO-IS or 8302-HO-IS intrinsically safe variants.

Is Emerson still producing the 8102-HO-IP?

Emerson’s current PAC8000 documentation continues to identify 8102-HO-IP in its PAC8000 Remote I/O ordering information and recent AMS documentation continues to list it as a supported analog-output module. That establishes current documentation support, but does not by itself guarantee factory stock or lead time.

How should New Surplus 8102-HO-IP stock be verified?

Request photographs of the actual module, including the complete 8102-HO-IP label, revision information, connectors, and physical condition. For a production-critical replacement, request an electrical test report covering multiple 4–20 mA points and, where required, HART communication.