TC-IDX161 Honeywell 16-Point Diagnostic Input, TC-IDX161 10-30 VDC

TC-IDX161 Honeywell 16-Point Diagnostic Discrete Input Module

The Honeywell TC-IDX161 is a 16-point diagnostic discrete input module. It accepts 10-30 VDC field signals. Four points share one common return. The module meets IEC Type 1+ input compatibility. It reports open wire and change of state faults in software. Leakage resistors let you use the module on triac outputs. Short and inrush current peaks at 250 mA and decays fast. Each channel pair carries 2546 VDC isolation. This suits dense cabinets and mixed signal panels. Oiltech Controls stocks tested units. Write to info@oiltechcontrols.com for lead times.

Key Specifications at a Glance

• Brand: Honeywell
• Model: TC-IDX161
• Module type: 16-point diagnostic discrete input
• Points: 16 total, 4 points per common
• Input voltage: 10-30 VDC, 24 VDC nominal
• Compatibility: IEC Type 1+
• Connection: TC-TBCH 36-position terminal block

Diagnostics and Electrical Detail

• Open wire detection reports broken field wiring.
• Change of state logging flags fast transitions.
• Both diagnostics are software configurable.
• Off state leakage current caps at 1.21 mA.
• Short and inrush current reaches 250 mA peak.
• Peak decays below 37% in 22 ms with no activation.
• Off state voltage stays under 5 VDC.
• On state current needs 2.0 mA at 10 VDC.
• Input impedance peaks at 3.7 KΩ at 10 VDC.
• Power dissipation holds at 5.8 W maximum.

Leakage Resistor Selection

• Use leakage resistors with triac or solid state outputs.
• Formula uses field side power supply voltage, or P/S.
• Rleak maximum = (P/S voltage – 4.6 VDC) / 1.21 mA
• Rleak minimum = (P/S voltage – 5 VDC) / 1.5 mA
• For 12 Vdc +/-5% use 5.23 KΩ, 1/4 W, 2%.
• For 24 Vdc +/-5% use 14.3 KΩ, 1/4 W, 2%.

Signal Delay Settings

• Off to on delay options: 0, 1 or 2 ms.
• On to off delay options: 0, 1, 9 or 18 ms.
• Set delay in software. No jumper change is needed.
• Longer off delay filters contact bounce.
• Short delay suits fast machine events.

Isolation and Connection

• Channel to channel isolation: 100% tested at 2546 VDC for 1 s.
• User to system isolation: 100% tested at 2546 VDC for 1 s.
• Wire field signals to the TC-TBCH 36-position terminal block.
• Plan commons in groups of 4 points.
• Keep wiring clear of drive and motor cables.

Commissioning and Upkeep

• Set delay and diagnostic options before loop start.
• Confirm leakage resistor value for your field voltage.
• Check open wire alarms during first power up.
• Review change of state logs after test runs.
• Recheck terminal screws after the first heat cycle.
• Keep panel airflow clear at 5.8 W load.

Fit and Compatibility

• Fits Honeywell racks that accept the TC-IDX161.
• Works with 24 VDC sensor and relay outputs.
• Handles triac outputs when you fit leakage resistors.
• Suits legacy and obsolete Honeywell control systems.
• Inputs share commons in groups of four.
• Match field voltage to the 10-30 VDC window.

Typical Equipment and Use Cases

• Machine tool interlock and guard switch panels.
• Valve and damper end position feedback.
• Conveyor and packaging line sensor banks.
• Pump and fan run status contacts.
• Safety relay auxiliary contact monitoring.
• Legacy DCS discrete input expansion.

Oiltech Controls’s Insight

• Open wire diagnostics save hours on long field runs.
• Leakage resistor sizing matters most on triac outputs.
• Group commons reduce wiring in dense panels.
• Fixed 1 or 2 ms filters cut false edges.
• Isolated groups protect against cross channel faults.
• Check field voltage tolerance before module swap.

Why Buy From Oiltech Controls?

• 15+ years handling industrial automation spare parts.
• Shipments reach most regions through global logistics partners.
• We test every surplus and refurbished unit before sale.
• Each order carries a 12-month warranty.
• Our team runs technical checks before dispatch.
• We source parts for obsolete control systems.
• Orders leave our warehouse in 24-28 hours.
• Shipping runs by FedEx, UPS, and DHL.

Warranty, Packing and Dispatch

• 1 x Honeywell TC-IDX161 diagnostic input module
• Test report with each unit
• Protective shock packing
• 12-month warranty terms
• Dispatch in 24-28 hours
• Carriers: FedEx, UPS, DHL

FAQ

What makes the TC-IDX161 different from a plain input card?

• It reports open wire and change of state faults itself.
• You see wiring faults before a machine stops.
• Diagnostics run in software, so no extra hardware is needed.

How do I pick a leakage resistor for triac outputs?

• Start from the field side power supply voltage.
• Use 5.23 KΩ for 12 Vdc and 14.3 KΩ for 24 Vdc.
• Keep the resistor at 1/4 W, 2% for stable readings.
• Run the formula check when your supply drifts outside 5%.

Which delay setting should I start with?

• Begin at 0 ms off to on and 0 ms on to off.
• Add delay only when you see contact bounce.
• Try 9 or 18 ms on to off for slow mechanical contacts.

Can I use it in existing Honeywell racks?

• Yes, if the rack accepts the TC-IDX161 module.
• Use the TC-TBCH 36-position terminal block for field wires.
• Confirm rack power budget before you add units.
• Ask us for a cross reference when the old part is obsolete.

What should I check before buying a used unit?

• Confirm the field voltage sits in the 10-30 VDC range.
• Ask for test records and the 12-month warranty terms.
• Check common grouping against your panel wiring plan.
• Order spare leakage resistors with the module.

Contact Information

Email: info@oiltechcontrols.com
Phone / WhatsApp: +86 158 8020 0923

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