TC-IDA161 Honeywell 120 VAC 16-Point Discrete Input Module

TC-IDA161 Honeywell 120 VAC 16-Point Discrete Input Module

The TC-IDA161 is a 120 VAC discrete input module from the Honeywell TC series. It provides 16 inputs arranged in two groups of 8 with a common. Each channel reads IEC Type 1+ field devices. Hardware delay and filter time are programmable per module. This suits plant floors with high-voltage pushbuttons, limit switches, and relay contacts.

Engineers pick this module for noisy AC environments. The 79-132 VAC on-state window rejects low-level leakage. Off-state current stays below 2.5 mA. The 2546 VDC isolation test protects the backplane from field transients.

Technical Specifications

• Brand: Honeywell
• Model: TC-IDA161
• Series: TC Series Discrete Input
• Module Type: 120 VAC, 16-point discrete input
• Input Count: 16 inputs, 8 points per common
• Nominal Input: 120 VAC
• On-State Voltage: 79-132 VAC, 47-63 Hz
• On-State Current (min): 5 mA at 79 VAC
• Off-State Voltage (max): 20 VAC
• Off-State Current (max): 2.5 mA
• Input Impedance: 11 kΩ max at 60 Hz
• Nominal Input Current: 12.5 mA at 50 or 60 Hz
• Off to On Delay: 1 ms or 2 ms programmable, 10 ms max plus filter
• On to Off Delay: 9 ms or 18 ms programmable, 8 ms max plus filter
• Input Compatibility: IEC Type 1+
• Power Dissipation: 6.0 W max
• Short/Inrush Current: 250 mA peak, decays below 37% in 22 ms
• Isolation: 2546 VDC, 1 s, channel-to-channel and user-to-system
• Terminal Block: TC-TBNH, 20-position

Series Insight from Oiltech Controls

• The TC-IDA161 belongs to the Honeywell TC I/O family.
• It shares terminal bases with other TC modules.
• The 8-point common layout simplifies field wiring.
• Programmable delays help match PLC scan time.
• It replaces older 120 VAC input cards in legacy racks.

Compatible Equipment

• Honeywell TC terminal bases and racks
• IEC Type 1+ pushbuttons and selector switches
• AC limit switches and relay contacts
• Motor starter auxiliary contacts
• Legacy Honeywell control systems needing spares

Installation Notes

• Mount in a clean cabinet with IP54 housing or better.
• Use TC-TBNH 20-position terminal blocks.
• Keep AC field wiring away from signal cables.
• Set delay jumpers before power-up.
• Verify group commons are tied correctly.

Commissioning and Maintenance

• Check on-state current stays above 5 mA at low line.
• Measure off-state leakage below 2.5 mA.
• Adjust filter time to reject contact bounce.
• Re-test isolation after any field rewire.
• Log delay settings for future module swaps.

Five Professional FAQ

Q1: Can the TC-IDA161 read 120 VAC proximity sensors?

A1: Yes, if the sensor meets IEC Type 1+ and draws at least 5 mA at 79 VAC. Check the off-state leakage stays under 2.5 mA. Leaky sensors can cause false ON states. Engineers often add a bleeder resistor in that case.

Q2: How do I choose between 1 ms and 2 ms off-to-on delay?

A2: Use 1 ms for fast interlock signals. Use 2 ms for mechanical contacts that bounce. Match the setting to your PLC scan time. Long filter time plus long delay slows trip response. Keep critical trips on the short setting.

Q3: What causes a channel to stay ON with no field signal?

A3: Check for leakage current from long AC cables. Cable capacitance can hold enough charge to exceed 2.5 mA. Also check for shared commons between groups. A miswired common can back-feed a channel. Measure voltage at the terminal with a true-RMS meter.

Q4: Is this module a direct replacement for older 120 VAC input cards?

A4: It fits TC racks with TC-TBNH terminal blocks. Confirm your backplane slot supports the TC series. Check power budget against the 6.0 W dissipation. For other vendors, compare on-state window and off-state current first. Ask us for a cross-reference before ordering.

Q5: How should I buy a spare for an obsolete line?

A5: Match the exact model and terminal block type. Confirm firmware and rack revision with your maintenance team. Choose a tested unit with a 12-month warranty. Keep one spare per rack. Contact us for stock photos and test reports before purchase.

Why Buy From Oiltech Controls?

• 15+ years sourcing industrial automation spare parts
• Worldwide delivery through FedEx, UPS, and DHL
• Surplus and refurbished units, fully tested
• 12-month warranty on every order
• Technical check before dispatch
• Lifeline support for obsolete control systems
• Ships in 24-28 hours after order confirmation

Order and Support

Email info@oiltechcontrols.com or message +86 158 8020 0923 on WhatsApp. We confirm stock, test status, and lead time fast. Shipping runs by FedEx, UPS, and DHL with tracking. Each unit carries a 12-month warranty.

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