Overview
Manuals
Temperature IOM
TC and RTD Limits
Detection and Wiring
Features:
- Honeywell lists 8C-PAIMA1 as a coated low-level TC/RTD temperature IOM.
- The 2022 specification gives 16 isolated channels and a fixed one-second scan.
- The documented 8C-TAIMA1 IOTA is non-redundant; the function matrix lists no redundant alternative.
Honeywell's Series 8 Controller and I/O Specification section 4.4.4 names 8C-PAIMA1 as a coated low-level analog temperature input module. It accepts up to 16 thermocouple or RTD channels through the 8C-TAIMA1 non-redundant IOTA. The table states 24 VDC, 120 mA, fully isolated channels, a fixed one-second scan and 0 to 4.7 Hz bandwidth. It gives -20 to +100 mV as a thermocouple-only nominal range, so that number should not be presented as an RTD resistance range. The source also details specific supported sensor types and installation limits, which must be matched to each configured channel.
The same Honeywell section describes remote cold-junction compensation capability and configurable open-thermocouple detection. Those functions depend on the configured module and application, not simply a loose spare. Its TC/RTD function matrix shows 8C-TAIMA1 in the non-redundant IOTA column and NA for a redundant IOTA. The reviewed PDF does not associate 51454473-275 with 8C-PAIMA1, so verify the full physical label and parts record. Record each sensor type, lead wiring, cold-junction configuration, channel calibration and baseline diagnostics before authorized work. After replacement, verify temperature readings, open-sensor handling and affected control actions under the site test plan.
The 8C-PAIMA1 51454473-275 Honeywell TC/RTD Temperature Input Module may still be available for purchase and support from Moore Automated Company beyond End-Of-Life (EOL) by the manufacturer (OEM).
Honeywell 8C-PAIMA1 51454473-275 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.
Honeywell identifies 8C-PAIMA1 as a coated low-level analog temperature input IOM, not a generic high-level process-current input. The official table pairs it with 8C-TAIMA1, a nine-inch non-redundant IOTA, and the function matrix shows no redundant alternative. Confirm the physical 8C-PAIMA1 marking and the additional 51454473-275 site number before declaring an exact replacement; the reviewed OEM PDF does not map that extra number.
The 2022 manufacturer table lists 16 isolated channels, 24 VDC, 120 mA and a fixed one-second scan. Its -20 to +100 mV nominal range applies to thermocouples only, while RTDs require the documented excitation, sensor type and lead arrangement. Do not treat one sensor's temperature range or accuracy as universal across all thermocouple and RTD selections. Verify each channel's configured element and installation details against the manufacturer table.
Honeywell describes cold-junction compensation and configurable open-thermocouple detection in this section. These features operate within a configured module, IOTA and control application. A replacement should preserve sensor polarity, RTD lead wiring, channel assignment, cold-junction settings and open-sensor behavior. The TC/RTD function matrix identifies only a non-redundant IOTA; do not promise a redundant assembly or automatic hot replacement from this source alone.
