Overview
The Honeywell TC-IDK161, also cataloged as the TC-IDK161 16-Point Isolated 120 VAC Discrete Input Module, operates as a dedicated hardware component for acquiring isolated AC field switching signals within Honeywell Experion PKS and C200/C300 control systems.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | TC-IDK161 (Alternate designation: TK-IDK161) |
| Brand | Honeywell |
| Origin | USA |
| Dimensions | Approx. 356 mm x 51 mm x 178 mm |
| Power Consumption | 4.9 W maximum |
| Module Type | 16-Point Isolated 120 VAC Discrete Input Module |
| Input Channels | 16 individually isolated digital input channels |
| Nominal Input Voltage | 120 VAC |
| On-State Voltage Range | 79 VAC to 132 VAC, 47-63 Hz |
| Off-State Voltage Maximum | 20 VAC |
| On-State Current | Minimum 5 mA at 79 VAC; 15 mA at 132 VAC |
| Off-State Current | Maximum 2.5 mA |
| Input Impedance | Maximum 11 kOhm at 60 Hz |
| Input Standard | IEC 61131-2 Type 1+ |
| Isolation Voltage | 2546 VDC for 1 s, channel-to-channel and user-to-system |
| Short / Inrush Current | 250 mA peak, decays below 37% within 22 ms |
| Backplane Current Draw | 125 mA at 5.1 VDC; 3 mA at 24 VDC |
| Hardware Input Delay | Off-to-On: 1-2 ms; On-to-Off: 9-18 ms |
| Filtered Input Delay | Off-to-On up to 10 ms; On-to-Off up to 8 ms |
| Terminal Block Connector | 36-position TC-TBCH terminal block |
| Compliance | CE, UL, ATEX / IECEx, CSA, FM Class I Div 2 |
Channel Isolation and DCS Signal Processing
The TC-IDK161 applies channel-to-channel isolation to separate individual 120 VAC field input circuits from each other and from the control electronics. Therefore, transient voltage events on one field circuit have limited influence on adjacent input channels.
The module accepts IEC 61131-2 Type 1+ compatible AC switching signals, including relay contacts, pushbuttons, and limit switches. Additionally, the hardware input filtering and defined voltage thresholds provide stable discrete signal recognition for Experion PKS and C200/C300 I/O processing.
Frequently Asked Questions
Q: Does the TC-IDK161 support individual channel isolation?
A: Yes. Each of the 16 input channels provides electrical isolation between field circuits and between the field interface and system electronics.
Q: What backplane power does the TC-IDK161 require?
A: The module draws 125 mA at 5.1 VDC and 3 mA at 24 VDC from the controller system backplane.
Q: Can the TC-IDK161 be replaced while the system remains powered?
A: The module supports Removal and Insertion Under Power (RIUP) within compatible Honeywell chassis configurations. Maintenance personnel must verify system procedures before replacement.
Field Installation Guidelines
- Install the TC-IDK161 in the specified Honeywell Experion PKS or C200/C300 chassis position according to the system hardware configuration manual.
- Use the approved TC-TBCH 36-position terminal block for field wiring termination.
- Separate AC field wiring from low-level communication and signal cables to reduce electrical interference.
- Connect cable shields according to the site grounding standard and maintain proper grounding practices.
- Verify field voltage levels before connecting external AC discrete devices to input channels.
- Confirm terminal assignments and channel mapping during commissioning to prevent incorrect discrete signal interpretation.
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