Overview
Manuals
HART Connection Rules
Tag and Scan Setup
Failover Data Handling
Features:
- Sixteen HART high-level analog input channels in one PM I/O slot.
- Point-to-point HART connections with redundant or nonredundant installation options.
- Coated 51403479-150 execution with 225 mA listed IOP current at 24 V DC.
MC-PHAI01 is the PM I/O processor for sixteen high-level analog input channels with HART access. Honeywell's architecture places the processor in one physical card-file slot and permits redundant or nonredundant installations. HART connections are point-to-point, and the guide explicitly excludes multidrop operation. HENABLE controls whether HART communication is enabled for the configured points, while other device and channel settings remain part of the installed control database. Replacement therefore requires more than matching the front label: the termination hardware, redundancy arrangement, configured points and supported transmitter behavior must also be checked.
HSCANCFG selects periodic collection of supported HART variables such as PV, SV, TV and FV. The available variables depend on the connected field instrument and its setup. During redundant failover, analog process data is tracked between processors, but device-resident HART dynamic values are not continuously transferred to the secondary; the held values remain until the newly primary processor reconnects and refreshes them. Honeywell's component-power table lists 225 mA at 24 V DC for MC-PHAI01. That number is the processor-card contribution only and must not be treated as the complete cabinet, termination or field-transmitter power requirement.
The MC-PHAI01 51403479-150 Honeywell HART High-Level Analog Input Processor may still be available for purchase and support from Moore Automated Company beyond End-Of-Life (EOL) by the manufacturer (OEM).
Honeywell MC-PHAI01 51403479-150 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.
Each field instrument uses a point-to-point HART connection to the configured input channel. The reviewed Honeywell guide states that multidrop operation is not supported for this PM I/O implementation. Check the installed field-termination assembly, channel assignment and transmitter wiring before replacement; a generic HART-capable label does not establish compatibility with the existing termination or database.
HENABLE governs HART operation for configured points and can affect licensed tag use. HSCANCFG controls periodic collection of supported dynamic variables. PV, SV, TV and FV availability depends on the connected instrument and its configuration. Preserve these settings with the channel database and verify them during commissioning instead of assuming that every HART device exposes the same variables.
In a redundant arrangement, the processor tracks analog process data, but the secondary does not continuously mirror device-resident HART dynamic data. After failover, previously reported HART values are held until the new primary reconnects and refreshes them. Alarm handling and control logic should therefore be reviewed for this transition rather than treating the held values as newly acquired device data.
