Overview
The Honeywell 8U-TAIDA1 is a non-redundant, uncoated analog input Input/Output Termination Assembly (IOTA) designed to support industrial process signal acquisition. It accommodates 16 single-ended or differential input channels using either current or voltage signals, with a 16-bit analog-to-digital converter. The module supports 1-5 V signals and 4-20 mA signals through 250 ohm resistors, with module removal and insertion under power supported.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 8U-TAIDA1 |
| Brand | Honeywell |
| Product Type | Analog Input IOTA |
| IOTA Size | 9 in |
| Input Type | Single-ended or differential current/voltage inputs |
| Input Channels | 16 |
| A/D Converter Resolution | 16 bits |
| Input Range | 1-5 V, 4-20 mA through 250 ohm resistors |
| Voltage Rating | 24 VDC |
| Module Current Rating | 310 mA |
| Normal Mode Rejection Ratio | 19 dB at 60 Hz |
| Normal Mode Filter Response | Single-pole RC, -3 dB at 6.5 Hz |
| Crosstalk | -60 dB, DC to 60 Hz, channel-to-channel |
| Maximum Input Voltage | +/- 30 V, any input referenced to common, no damage |
| Input Scan Rate | 50 ms |
| Hardware Accuracy at CMV = 0 V | +/- 0.075% of full scale at 23.5 +/- 2 deg C |
| Hardware Accuracy at CMV = 0 V | +/- 0.15% of full scale from 0 to 60 deg C |
| Operating Temperature | 0 to 60 deg C |
| Storage Temperature | -40 to 85 deg C |
| Module Removal and Insertion Under Power | Supported |
| Agency Certifications | Class I, Division 2, Groups A, B, C, D; T4; Class I, Zone 2, AEx/Ex nA IIC T4 |
Input Configuration and Signal Handling
The 8U-TAIDA1 provides termination for analog field signals in either single-ended or differential configurations. Its 16-channel capacity allows multiple process signals to share one IOTA assembly. Differential wiring measures the signal between two input terminals, while single-ended wiring references the signal to a common connection.
For current inputs, the specified 250 ohm resistance converts a 4-20 mA signal into a nominal 1-5 V signal. This relationship supports signal-range identification when checking field wiring and input configuration.
Accuracy and Filtering
The specified hardware accuracy is temperature-dependent. The tolerance is +/- 0.075% of full scale near 23.5 deg C and +/- 0.15% of full scale across the 0 to 60 deg C operating range, with common-mode voltage at 0 V. The single-pole RC filter has a -3 dB point at 6.5 Hz, while the stated channel-to-channel crosstalk is -60 dB from DC to 60 Hz.
Frequently Asked Questions
Q: Does the 8U-TAIDA1 support both single-ended and differential inputs?
A: Yes. It supports both configurations across its 16 input channels. The required wiring and jumper configuration must match the intended signal arrangement.
Q: Can the 8U-TAIDA1 accept 4-20 mA signals?
A: Yes. The specified current input range is 4-20 mA through 250 ohm resistors. Confirm the installed input configuration before connecting field signals.
Q: Is the 8U-TAIDA1 a redundant IOTA?
A: No. The 8U-TAIDA1 is the non-redundant, uncoated version. The redundant differential IOTA is identified separately as 8U-TAIDB1.
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