Overview
The Honeywell 8C-PDIL51 51454359-175 is a 32-channel digital input module designed to receive discrete field signals for industrial control systems. It operates with a 24 VDC nominal input supply and uses optical isolation in the I/O module to separate field signals from internal circuitry. This version is specified without open wire detection, making configuration identification important when selecting a replacement module.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 8C-PDIL51 |
| Part Number | 51454359-175 |
| Brand | Honeywell |
| Product Type | Digital Input Module |
| Input Channels | 32 |
| Nominal Input Voltage | 24 VDC |
| DI Power Voltage Range | 18 to 30 VDC |
| Open Wire Detection | Not included |
| Galvanic Isolation | 1000 VAC RMS |
| Isolation Technique | Optical (in IOM) |
| 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 |
| Absolute Delay Across Input Filter and Isolation | 5 ms +/- 20% |
| Field Resistance for Guaranteed ON Condition | 300 Ohm maximum at 15 VDC |
| Tariff Code | 8537101190 |
| Country of Origin | USA |
| Estimated Shipping Size | 6 x 15.2 x 14.3 cm |
| Weight | 0.3 kg |
Digital Input Signal Handling
The 8C-PDIL51 receives discrete signals from field devices and converts their ON/OFF states into input information for the control system. Its 32 input channels allow multiple field signals to be collected through one module. The specified 18 to 30 VDC operating range accommodates a nominal 24 VDC input supply.
Input Thresholds and Signal Isolation
The module distinguishes ON and OFF states using specified voltage and current thresholds. An ON signal requires at least 13 VDC or 3 mA, while an OFF signal is specified at no more than 5 VDC or 1.2 mA. Signals between these limits should not be classified solely from the stated thresholds; verify the applicable input characteristics before commissioning.
Optical isolation in the I/O module provides electrical separation between field input circuits and internal circuitry. The specified galvanic isolation rating is 1000 VAC RMS. The absolute delay across the input filter and isolation is 5 ms +/- 20%, which should be considered when evaluating input response timing.
Configuration and Selection Notes
This version is specified as without open wire detection. When replacing an installed module, verify the complete part number, 32-channel configuration, input voltage range, and open wire detection requirements. The absence of this feature should be considered when the application depends on detecting broken field wiring.
Frequently Asked Questions
Q: How many digital input channels does the Honeywell 8C-PDIL51 provide?
A: It provides 32 digital input channels for monitoring discrete field signals.
Q: What input voltage range does the 8C-PDIL51 support?
A: The specified DI power voltage range is 18 to 30 VDC, with 24 VDC as the nominal supply voltage.
Q: Does the 8C-PDIL51 support open wire detection?
A: No. The supplied configuration is specified without open wire detection. Confirm this feature requirement when selecting a replacement for an existing installation.
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