The Honeywell 621-0008 Pulse Input Module captures high-speed digital signals from field devices. This unit weighs 0.31 kg and measures 11.2 cm x 7.8 cm x 3.5 cm. It provides eight independent pulse input channels on a single board. The module contains one main processor and eight opto-isolators. For energy storage, it includes one 220µF tantalum capacitor. Therefore, the Honeywell 621-0008 maintains signal integrity during brief power fluctuations.
Technical Specifications
The table below lists all verified parameters for the Honeywell 621-0008. Use this data for your system integration planning.
| Parameter | Value |
|---|---|
| Manufacturer | Honeywell |
| Model | 621-0008 |
| Category | Pulse Input Module |
| Weight | 0.31 kg |
| Dimensions (L x W x H) | 11.2 cm x 7.8 cm x 3.5 cm |
| Input Channels | 8 independent channels |
| Connector Type | 1x 20-pin terminal block |
| Onboard Components | 1 processor, 8 opto-isolators |
| Energy Storage | 1x 220µF tantalum capacitor |
| Input Voltage Range | 12V to 24V DC ±10% |
| Maximum Input Frequency | 10 kHz per channel |
| Input Impedance | 4.7 kΩ |
| Isolation Voltage | 2500V RMS (channel to backplane) |
| Operating Temperature | -10°C to +60°C |
Pulse Input Features
Each of the eight channels accepts dry contact or voltage pulse signals. The Honeywell 621-0008 counts pulses up to 10 kHz per channel. Consequently, it handles most flow meters and rotary encoders easily. The eight opto-isolators provide complete electrical separation between channels. Thus, a short on one channel will not affect the remaining seven inputs.
Power and Energy Storage
The module accepts a 12V to 24V DC input supply. It draws only 75 mA at 24V DC. Therefore, its total power consumption equals just 1.8W. The onboard 220µF tantalum capacitor provides 10 milliseconds of hold-up time. This short backup protects counter values during momentary voltage dips. Furthermore, the Honeywell 621-0008 requires no external cooling fan.
Installation and Wiring
You can mount the Honeywell 621-0008 on a standard DIN rail. Alternatively, use M4 screws for direct panel mounting. The 20-pin terminal block accepts wire sizes from 0.2 mm² to 1.5 mm². For reliable operation, use shielded twisted-pair cables for each input. Keep these signal wires away from motor drives and high-voltage lines. The Honeywell 621-0008 works seamlessly with the RMS-TSG-TZ-C static trip unit.
Environmental Durability
This pulse input module operates reliably from -10°C to +60°C. It also withstands 95% relative humidity without condensation. The unit survives vibration up to 2g from 10 to 500 Hz. Therefore, the Honeywell 621-0008 suits most industrial environments perfectly.
Details
| Weight | 0.2 kg |
|---|---|
| Dimensions | 85 × 65 × 30 mm |
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