Overview
Manuals
Output Loading
FAILOPT Behavior
HART Compatibility
Features:
- Sixteen 4–20 mA output channels with HART device status/configuration and optional redundancy through the correct IOTA.
- Calibrated output accuracy of ±0.35% full scale at 25°C, including linearity; readback accuracy is a separate ±4% full-scale specification.
- Per-channel FAILOPT settings and open-wire diagnostics, with a documented zero-current output when IOM electronics fail.
The Honeywell CC-PAOH51 converts control commands into sixteen regulated current outputs for process actuators and compatible recording or indicating equipment. Normal control uses the 4–20 mA range, while the documented directly settable values include zero and 2.9–21.1 mA. HART communication supplements the analog command with device status and configuration access. A CC-TAOX51 IOTA provides the non-redundant arrangement; a CC-TAOX61 provides the redundant arrangement. Their nominal six-inch and twelve-inch dimensions describe the termination boards, not the module's shipping package.
Commissioning requires more than confirming the channel count. The loop must remain within the specified resistance and compliance limits, and the controller must use supported hardware, firmware and HART settings. Honeywell's comparison lists sixteen HART communication units for this model and excludes certain one-second and two-second scan choices available on CC-PAOH01. The common AO-HART block therefore does not establish equivalent hardware or permit an arbitrary mixed redundant pair. Each channel's failure setting and actuator response should be tested against the process design, including the separate case of electronics failure driving the output to zero.
The CC-PAOH51 Honeywell HART Analog Output Module may still be available for purchase and support from Moore Automated Company beyond End-Of-Life (EOL) by the manufacturer (OEM).
Honeywell CC-PAOH51 official technical documentation and product links.
This multi-page Honeywell technical document contains the exact model and its technical data. Apply the values to the supplied type number and verify its revision before installation.
The specified maximum resistive load is 800 Ω when the nominal 24 V supply is within 22–28 Vdc. Under the same supply condition, maximum output compliance is 16 V; maximum open-circuit voltage is separately listed as 22 V. Include the actuator, cable and other series elements in the loop assessment. An unloaded voltage reading alone does not demonstrate that the circuit can deliver its full commanded current.
Each output channel can be configured to retain its last value or move to a selected safe value under the applicable FAILOPT condition. This must not be confused with an IOM electronics failure, for which Honeywell specifies zero output current. Verify the actuator's response to both cases during an approved loop test. The module can also report an open field wire as a channel soft failure.
Honeywell lists sixteen HART communication units for CC-PAOH51. The model comparison excludes the 1 Sec Dynamic, 1 Sec Device and 2 Sec Device and Dynamic scan choices supported by CC-PAOH01. It also states that field calibration is not required. Check the actual controller release, device requirements and configured scan selections; matching the AO-HART block name does not remove the hardware and IOTA compatibility requirements.
