51306999-175 | Honeywell 8C-TAIM01 LLMUX IOP Module

Function

The 8C-TAIM01 Low Level Analog (Temperature) Input （LLMUX） IOP module handles up to 64 channels for temperature inputs. It uses Honeywell’s PMIO LLMUX FTA, with each FTA supporting 16 channels. You can mix RTD, Thermocouple (TC), and millivolt (mV) inputs based on system needs. This module offers high-precision temperature measurements and integrates easily with Honeywell devices.

Notable Features

TC and RTD Operation: Supports thermocouples (TC) and RTDs for flexible temperature sensing.
Remote Cold Junction Compensation (CJC): Ensures accurate readings by compensating for temperature changes at connection points.
Open Thermocouple Detection (OTD): Provides protection against open thermocouple errors.
1 Second PV Scanning: Scans all temperature inputs every second and includes OTD protection.
Temperature Points Expansion: You can add temperature points in increments of 16, allowing system scalability.

Temperature Support

The LLMUX system uses solid-state PMIO LLMUX FTA, supporting both RTD and Thermocouple (TC) inputs. The system collects data from all temperature points every second and includes Open Thermocouple Detection (OTD). If a thermocouple is open, the system sets the process variable (PV) to NaN, preventing control errors.

Sampling and Open Sensor Detection

The module detects open sensors before propagating the PV. With OTD enabled, the PV is sampled, and the system checks for errors in the same measurement window. If an error occurs, the PV is set to NaN, and a soft failure is flagged. This prevents invalid readings from affecting the system. Importantly, OTD processing does not introduce delays in PV sampling or reporting.

Detailed Specifications – Low Level Input Multiplexer

Parameter	Specification
Input/Output Model	8C-PAIM01, LLMUX, Coated
	8U-PAIM01, LLMUX, Uncoated
IOTA Models	8C-TAIM01, Coated
	8U-TAIM01, Uncoated
FTA Models	MC-TAMT04, MC-TAMR04
Input Type	Thermocouple and/or RTD
Input Channels	64 fully isolated channels, in increments of 16
Input Scan Rate	1 second fixed by IOM (up to 64 channels/sec max.)
Input Range (TC only)	-20 to +100 millivolts
Normal Mode Input Range	-10 to +10 Volts (TC); -1 to +2 Volts @ 100mA (RTD)
Gain Error	0.050% full scale (for -20 to +100mV range)
Temperature Stability	TC and mV inputs: ±20 ppm/°C max; RTD inputs: ±20 ppm/°C max
Input Impedance	1 MΩ at DC (for TC)
Cold Junction Compensation	-20°C to +60°C (±0.5°C typical)
RTD Sensor Excitation Current	1 mA
Surge Protection	EN 61000-4-5 (1kV line-to-line, 2kV line-to-ground) for industrial locations
Max Cable Distance	1000 feet (16 gauge wire, two twisted pairs per FTA)
Supported RTD Types	Pt100 (DIN 4376, JIS C-1604), Ni120, Cu10
Supported Thermocouple Types	ANSI specifications J, K, E, T, B, S, R, and more
Open Thermocouple Detection	≤ 1000 Ω = no-trip; ≥ 1500 Ω = guaranteed trip
RTD Max Lead Resistance	15 Ω
FTA Dimensions	2.5 D x 4.9 W x 12.1 L inches (63.5 D x 124.46 W x 307.34 L mm)

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