Product Overview
Honeywell TC-FIAH81 is a high-level analog input module for industrial control systems. It offers 8 single-ended, non-isolated input channels. The module supports 4-20mA, 0-20mA, ±10V, and 0-10V user-configurable signals. It delivers reliable performance for process monitoring and automation.
This module uses successive approximation conversion. It provides 12-bit unipolar / 11-bit plus sign bipolar resolution on voltage inputs. Current inputs offer 5.13µA/count resolution. The TC-FIAH81 is ideal for space-constrained racks with high-channel density. It requires no calibration. The step response is 9.4ms for voltage and 18.2ms for current terminals.
Technical Specifications
| Parameter | Value |
|---|---|
| Brand / Model | Honeywell TC-FIAH81 |
| Number of Inputs | 8 single-ended, non-isolated |
| Input Signal Range | 4-20mA, 0-20mA (current); ±10V, 0-10V (voltage) — user configurable |
| Resolution | Voltage: 12 bits unipolar / 11 bits + sign bipolar (2.56mV/cnt unipolar; 5.13mV/cnt bipolar); Current: 5.13µA/cnt |
| Input Impedance / Resistance | Voltage terminal: 100k / 200k; Current terminal: 238Ω |
| Isolation Voltage | 850V dc for 1s (user to system); no isolation between individual channels |
| Flexbus Current | 20mA @ 5V dc |
| Power Dissipation | 3W max @ 31.2V dc |
| Thermal Dissipation | 10.2 BTU/hr max @ 31.2V dc |
| Indicators | 1 green power indicator |
| Keyswitch Position | 3 |
| Data Format | Left justified 16-bit 2’s complement |
| Conversion Type / Rate | Successive approximation; 256µs all channels |
| Normal Mode Rejection | Voltage: -3db @ 17Hz; -20db/decade; -10.0dB @ 50Hz, -11.4dB @ 60Hz. Current: -3db @ 9Hz; -20db/decade; -15.3dB @ 50Hz, -16.8dB @ 60Hz |
| Calibration | None required |
| Step Response to 63% | Voltage: 9.4ms; Current: 18.2ms |
| Absolute Accuracy @ 25°C | Voltage: 0.20% Full Scale; Current: 0.20% Full Scale (includes offset, gain, non-linearity, repeatability) |
| Accuracy Drift with Temperature | Voltage: 0.00428% FS/°C; Current: 0.00407% FS/°C |
| Maximum Overload | 30V or 32mA continuous, one channel at a time |
| Dimensions (HxWxD) | 46mm x 94mm x 53mm (1.8in x 3.7in x 2.1in) |
| Environmental Temperature | Operating: 0 to 55°C (32 to 131°F); Storage: -40 to 85°C (-40 to 185°F) |
| Relative Humidity | 5 to 95% non-condensing (operating); 5 to 80% non-condensing (non-operating) |
| Shock / Vibration | Operating: 30g peak, 11ms; Non-operating: 50g peak, 11ms; Vibration: 5g @ 10-500Hz per IEC 68-2-6 |
| Wire Size | 12 gauge (4mm²) stranded max; insulation max 3/64 inch (1.2mm) |
| Certifications | Groups A, B, C, D; Class I Division 2; Class I Zone 2 Group IIC |
Why Buy From Oiltech Controls?
We bring 15+ years of industrial automation spare parts experience. Our team supports global shipment via FedEx, UPS, and DHL. You get tested industrial surplus and refurbished options with a 12-month warranty. Every module undergoes technical verification before shipment. We also help with obsolete control systems that are hard to source elsewhere.
Installation Guide
- Mount the TC-FIAH81 in a compatible Honeywell rack. Verify the keyswitch position is set to 3.
- Use 12 gauge stranded wire maximum. Keep insulation within 1.2mm.
- Connect voltage or current signals per your configuration. Do not exceed 30V or 32mA continuous per channel.
- Allow airflow around the module. Keep operating temperature within 0 to 55°C.
Commissioning and Maintenance
No calibration is required. The module has one green power indicator. Verify the Flexbus current (20mA @ 5V dc) during startup. Check accuracy drift if the ambient temperature changes significantly. Use the 256µs conversion rate for fast loop response. For long-term reliability, keep humidity below 95% non-condensing.
Compatibility and Diagnostics
The TC-FIAH81 fits Honeywell Series FTA and similar racks. It provides left justified 16-bit 2’s complement data for easy integration. Normal mode rejection at 50/60Hz reduces line noise. The module reports no isolation between individual channels, so plan grounding carefully. Overload protection helps avoid damage during wiring faults. For diagnostics, use the power indicator and check data register values in your control system.
Typical Applications
- Process monitoring in chemical and petrochemical plants
- Analog signal acquisition in power generation
- Machine control with 4-20mA or ±10V transducers
- Retrofit of obsolete Honeywell control systems
- Environmental monitoring in Class I Division 2 areas
FAQ
Q: Does the TC-FIAH81 need calibration?
A: No. It requires no calibration. Accuracy is 0.20% Full Scale at 25°C.
Q: What is the resolution on current inputs?
A: Current inputs offer 5.13µA/count. Voltage inputs are 12-bit unipolar or 11-bit plus sign bipolar.
Q: Can I use this module in a Class I Div 2 area?
A: Yes. It is certified for Class I Division 2, Class I Zone 2 Group IIC, and Groups A, B, C, D.
Q: What is the warranty and shipping method?
A: All purchases include a 12-month warranty. We ship worldwide via FedEx, UPS, and DHL.
Q: How do I contact Oiltech Controls?
A: Email info@oiltechcontrols.com or WhatsApp +86 158 8020 0923.
Contact Information
Inquiries: info@oiltechcontrols.com | WhatsApp: +86 158 8020 0923
Packaging List: Honeywell TC-FIAH81 module, anti-static bag, protective foam, and quick-start reference. Power supply and rack sold separately.
Warranty: 12 months from date of delivery. Covers functional defects under normal use.
Shipping: FedEx, UPS, DHL. Tracking provided.
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