Overview
The Honeywell 8C-TDIL11 51306858-175 is a 32-channel digital input module that receives discrete signals from field devices and sends their status to a control system. It supports an 18 to 30 VDC input power range. In addition, optical isolation within the I/O module separates the input signal path, while the defined sensing thresholds and filter delay help engineers check signal levels and response timing.
Key Features
- 32 channels for digital input signals.
- 18 to 30 VDC input power range.
- Optical isolation within the I/O module.
- Galvanic isolation rating of 1500 VAC RMS or +/-1500 VDC.
- Defined ON and OFF voltage and current thresholds.
- Input filter and isolation delay of 5 ms +/- 20%.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 8C-TDIL11 51306858-175 |
| Spare Model | 51306858-175 |
| Brand | Honeywell |
| Product Type | Digital Input Module |
| Input Channels | 32 |
| DI Power Voltage Range | 18 to 30 VDC |
| ON Sense Voltage | 13 VDC minimum |
| ON Sense Current | 3 mA minimum |
| OFF Sense Voltage | 5 VDC maximum |
| OFF Sense Current | 1.2 mA maximum |
| Input Impedance | 4.2 kOhm |
| Galvanic Isolation | 1500 VAC RMS or +/-1500 VDC |
| Isolation Technique | Optical, in IOM |
| Absolute Delay Across Input Filter and Isolation | 5 ms +/- 20% |
| Manufacturer | Honeywell |
| Country of Origin | USA |
| Estimated Shipping Size | 29.5 x 12 x 7 cm |
| Weight | 0.46 kg |
| Tariff Code | 8537101190 |
Digital Input Signal Detection
The module uses voltage and current thresholds to distinguish ON and OFF input states. For an ON state, the specified minimum is 13 VDC or 3 mA. By contrast, an OFF state requires a voltage no higher than 5 VDC or a current no higher than 1.2 mA.
These limits help engineers check field signals before connecting sensors or other discrete signal sources. The 4.2 kOhm input impedance also helps when assessing the electrical load on the signal source. Therefore, check both the source output and the module’s sensing thresholds during system selection.
Optical Isolation and Response Time
The module uses optical isolation within the I/O module to separate the input signal path. Its specified galvanic isolation rating is 1500 VAC RMS or +/-1500 VDC. However, this isolation rating does not represent the normal operating input voltage range, which remains 18 to 30 VDC.
The input filter and isolation introduce an absolute delay of 5 ms +/- 20%. As a result, engineers should consider this delay when checking input response requirements or designing sequence logic. Actual system response may also depend on control processing and other system-level delays.
Frequently Asked Questions
Q: How many digital input channels does the Honeywell 8C-TDIL11 have?
A: The 8C-TDIL11 provides 32 digital input channels. Each channel monitors a discrete signal according to the specified input sensing thresholds.
Q: What voltage range does the 8C-TDIL11 support?
A: The specified DI power voltage range is 18 to 30 VDC. However, the ON and OFF sensing thresholds are different from the overall input power range, so check the actual field signal levels before use.
Q: What is the input delay of the 8C-TDIL11?
A: The absolute delay across the input filter and isolation is 5 ms +/- 20%. Therefore, include this delay when evaluating signal timing, while allowing for any additional processing delays in the control system.
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