TC-FIDA81 Honeywell Digital Input Module | 120 VAC 8-Point Spare

TC-FIDA81 Honeywell 120 VAC Digital Input Module

The TC-FIDA81 is a 120 VAC digital input module for Honeywell control racks. It brings eight field inputs into one non-isolated group. Each channel reads AC signals from switches, pushbuttons and proximity sensors. The module accepts a wide 85–132 VAC range at 47–63 Hz. A keyswitch sets the module address at position 8. Eight yellow LEDs show field-side status. Filter times are selectable through the output image table, so engineers can tune response to noisy contacts.

Input Channel Ratings

• Inputs: 8 channels, one group of 8, non-isolated
• ON-state voltage: 65 VAC minimum
• ON-state current: 7.1 mA minimum
• OFF-state voltage: 43 VAC maximum
• Maximum OFF-state current: 2.9 mA
• Nominal input impedance: 10.6 kΩ
• Nominal input current: 12 mA at 120 VAC, 60 Hz
• Proximity switch support: leakage below 2.5 mA, ON current up to 5 mA

Isolation and Filter Timing

• Channel-to-channel isolation: none
• Customer power to input channels: none
• User to system: 100% tested at 2150 VDC for 1 s
• OFF-to-ON filter options: 8.4, 8.6, 9, 10, 12, 16, 24 and 40 ms
• ON-to-OFF filter options: 26.4, 26.6, 27, 28, 30, 34, 42 and 58 ms
• Default filter: 8.4 ms OFF-to-ON, 26.4 ms ON-to-OFF

Power and Thermal Data

• Flexbus current: 30 mA max at 5 VDC
• Power dissipation: 4.5 W max at 132 VAC
• Thermal dissipation: 15.3 BTU/hr max at 132 VAC
• External supply: 120 VAC nominal, 85–132 VAC, 47–63 Hz

Environmental and Mechanical Limits

• Dimensions: 46 x 94 x 53 mm (1.8 x 3.7 x 2.1 in)
• Operating temperature: 0 to 55°C (32 to 131°F)
• Storage temperature: -40 to 85°C (-40 to 185°F)
• Relative humidity: 5 to 95%, non-condensing
• Operating shock: 30 g peak, 11 ms pulse
• Non-operating shock: 50 g peak, 11 ms pulse
• Vibration: 5 g at 10–500 Hz, IEC 68-2-6
• Wire size: 12 AWG (4 mm²) stranded max
• Insulation: 1.2 mm (3/64 in) max

Oiltech Controls Insight

• The TC-FIDA81 suits panels with existing 120 VAC field wiring.
• Non-isolated inputs keep cost down but need clean common wiring.
• Leakage-tolerant thresholds help with older proximity switches.
• Longer filter times cut false counts on contact bounce.
• Check the keyswitch position against the rack slot plan.

Which Equipment Uses It

• Honeywell Series C style I/O racks with 120 VAC field signals
• Pushbutton and selector switch input panels
• Proximity sensor loops on conveyor and packaging lines
• Legacy process cabinets kept in service
• Plants replacing failed input cards without rewiring

Why Buy From Oiltech Controls?

• More than 15 years in industrial automation spare parts
• Global shipment support to plant sites worldwide
• Tested surplus and refurbished options available
• 12-month warranty on every order
• Technical verification before shipment
• Support for obsolete control systems

Shipping, Warranty and Contact

• Dispatch in 24–28 hours after order confirmation
• Courier options: FedEx, UPS, DHL
• 12-month warranty included
• Email: info@oiltechcontrols.com
• WhatsApp: +86 158 8020 0923

Frequently Asked Questions

• Can I use this card with 24 VDC signals?
  No. The TC-FIDA81 reads AC only. ON-state voltage needs at least 65 VAC. Use a DC input module for 24 VDC loops.

• Why do my inputs chatter on contact bounce?
  The default filter is short. Select a longer filter time through the output image table. Try 16 ms or 24 ms for mechanical switches.

• Will old proximity switches work?
  Check the leakage current first. The module tolerates leakage below 2.5 mA. Sensors with higher leakage may stay ON falsely.

• Are the input channels isolated?
  No. Channels share one non-isolated group. Only user-to-system isolation is rated at 2150 VDC. Plan common wiring carefully.

• What should I verify before ordering a spare?
  Confirm the rack series, keyswitch position and field voltage. Note your filter time needs. Ask for test records and warranty terms.

Need a quote or test record? Reach us at info@oiltechcontrols.com or on WhatsApp at +86 158 8020 0923.

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