This frequency input module measures pulse signals from encoders and flow meters. It converts frequency inputs into digital values for the PLC system. You can install this unit into any Honeywell Series 900 rack slot. The module suits speed monitoring, flow totalization, and position tracking applications.
Technical Specifications & Key Parameters
| Parameter | Detail |
|---|---|
| Product Model | Honeywell 900K01-0201 |
| Category | 4 Channel Frequency Input Module |
| Dimensions (H x W x D) | 140 mm x 32 mm x 140 mm |
| Weight | 0.28 kg (0.62 lbs) |
| Number of Channels | 4 independent frequency inputs |
| Input Frequency Range | 1 Hz to 50 kHz per channel |
| Input Voltage Range | 5–24 V DC (TTL to industrial levels) |
| Input Impedance | 10 kΩ (minimizes signal loading) |
| Measurement Accuracy | ±0.05% of reading at full scale |
| Gate Time | 0.1 to 10 seconds (software selectable) |
| Resolution | 0.01 Hz at low frequencies, 1 Hz at high frequencies |
| Component Count | 32 ICs, 28 capacitors, 44 resistors |
| Energy Storage | 220 µF capacitor (holds last count for 10 ms) |
| Operating Voltage | 5V DC from backplane |
| Current Draw | 200 mA at 5V DC |
| Connector Type | One 20-pin removable screw terminal block |
| Wire Size | 16–22 AWG copper stranded |
| Status LEDs | Power, channel active (4 LEDs), fault |
Detailed Feature Overview
Honeywell 900K01-0201 measures pulse frequencies from 1 Hz to 50 kHz per channel. This wide range accommodates both slow flow meters and high-speed encoders. You can configure each channel independently for gate time and input threshold. The module accepts 5–24 V DC signals without external signal conditioners. Consequently, it connects directly to most industrial pulse generators.
The measurement accuracy reaches ±0.05% of the reading value. Software selectable gate times let you balance update speed against resolution. A short gate time captures rapid frequency changes quickly. A longer gate time improves low-speed measurement resolution. A 220 µF capacitor holds the last count value for 10 milliseconds during power dips.
Channel Configuration and Flexibility
All four channels operate independently with individual settings. You can mix slow flow meters and fast encoders on the same module. The input impedance of 10 kΩ prevents signal distortion from long cable runs. Four green LEDs show active pulse signals on each channel. A red fault LED indicates over-range or signal loss conditions.
Installation and Environmental Requirements
This module draws only 200 mA from the 5V DC backplane supply. Its lightweight 0.28 kg design simplifies mounting in any rack slot. The removable terminal block accepts 16–22 AWG copper wire. Use shielded cable for pulse inputs to minimize electrical noise. Operating temperature ranges from 0°C to 60°C reliably. Keep humidity below 95% without condensation for long life. Store the module between -40°C and 85°C for long-term preservation.
Details
| Weight | 0.2 kg |
|---|---|
| Dimensions | 85 × 65 × 30 mm |
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