Honeywell TC-IAH161 Analog Input Module

Core Technical Specifications

The TC-IAH161 analog input module accepts sixteen single-ended or eight differential analog signals from field sensors. This unit measures 180 millimeters in height, 40 millimeters in width, and 160 millimeters in depth, with a total weight of approximately 0.50 kilograms. Each input channel supports 0 to 20 milliamps or 4 to 20 milliamps current signals with a built-in 250-ohm resistor. The module features a 16-bit analog-to-digital converter that delivers high-resolution measurements for demanding applications.

Parameter	Specification
Dimensions (H x W x D)	180 x 40 x 160 mm
Weight	0.50 kg
Input Channels	16 single-ended / 8 differential
Input Signal Range	0–20 mA or 4–20 mA
ADC Resolution	16-bit
Input Impedance	250 Ω (built-in)
Conversion Time	10 ms per channel
Accuracy	±0.05% of full scale
Memory	4 KB RAM, 2 KB EEPROM
Logic Supply	200 mA @ 5V DC
Isolation	1000V (channel-to-bus)
Operating Temperature	-20 to 70 °C
Humidity	5% to 95% RH
Standards	CE, UL 508, CSA

Input Performance and Measurement Precision

The TC-IAH161 delivers outstanding accuracy with a rating of ±0.05% of the full-scale value. It scans all input channels sequentially with a typical conversion time of 10 milliseconds per channel. This module provides individual channel configuration for current loop measurements with HART protocol compatibility. It implements digital filtering to remove high-frequency noise from industrial environments. The unit also features automatic zero-calibration to maintain measurement integrity over extended operating periods.

Physical Installation and Connectivity

You can mount this module into any standard Honeywell Series C backplane using its single-slot design. Its front panel includes a 50-pin connector for all field input wiring terminations. LED indicators display power-on and channel activity for each input point. The unit’s 40-millimeter width enables high-density configurations in space-limited control cabinets. Its robust metal housing provides effective shielding against electromagnetic interference.

Memory Resources and Data Handling

The TC-IAH161 stores all input data and configuration parameters in 4 kilobytes of internal dual-port RAM. It retains calibration constants and scaling factors in 2 kilobytes of non-volatile EEPROM memory. This module maps each analog value to a specific register address in the processor’s I/O table. It also buffers up to 100 measurement samples for diagnostic purposes. The unit automatically checks data integrity using a cyclic redundancy check algorithm.

Power Distribution and Environmental Tolerance

This module draws a typical current of 200 milliamperes from the 5-volt DC backplane supply. It derives loop power from an external 24-volt DC source rated at 300 milliamperes. The TC-IAH161 operates reliably across a wide temperature range from -20 to 70 degrees Celsius. It withstands humidity levels between 5% and 95% without any condensation. The unit provides 1000 volts of galvanic isolation between each input channel and the logic bus.

Configuration and Diagnostic Features

You can configure each channel independently for current range, scaling, and alarm thresholds through software. The module supports HART pass-through communication for intelligent field device configuration. It provides open-circuit detection and over-range diagnostics for each input channel. The TC-IAH161 also includes a built-in test signal generator for verifying measurement accuracy. This self-test functionality simplifies routine maintenance and reduces system commissioning time.