This analog output module converts digital values from the PLC into DC voltage signals. It sends control signals to actuators, valves, and variable frequency drives. You can install this unit into any Series 620 rack slot. The module provides precise control for flow, pressure, and position applications.
Technical Specifications & Key Parameters
| Parameter | Detail |
|---|---|
| Product Model | Honeywell 621-0002 |
| Category | Analog Output Module |
| Dimensions (H x W x D) | 230 mm x 160 mm x 25 mm |
| Weight | 0.35 kg (0.77 lbs) |
| Number of Outputs | 4 analog output channels |
| Output Type | Voltage output only (0–10 V DC) |
| Resolution | 12 bits (2.44 mV per count) |
| Accuracy | ±0.2% of full scale at 25°C |
| Output Impedance | 100 Ω (drives up to 10 mA) |
| Settling Time | 5 ms to 99% of final value |
| Update Rate | 10 ms per channel (40 ms for all four) |
| Component Count | 24 ICs, 32 capacitors, 36 resistors |
| Energy Storage | 330 µF capacitor (holds last value for 15 ms) |
| Operating Voltage | 5V DC and 24V DC from backplane |
| Current Draw | 180 mA at 5V DC, 50 mA at 24V 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 621-0002 provides four analog outputs in the 0–10 V DC range. This voltage range suits most VFDs, valve positioners, and chart recorders. The module achieves 12-bit resolution with ±0.2% accuracy at room temperature. Each channel updates its output value every 10 milliseconds. Consequently, the module responds quickly to changing process conditions.
The 100 Ω output impedance drives loads up to 10 mA without signal drop. This capability allows you to connect multiple devices in parallel per channel. A 330 µF capacitor stores energy for brief power interruptions. It holds the last valid output value for 15 milliseconds during dips. Therefore, actuators remain steady through minor power fluctuations.
Channel Configuration and Diagnostics
All four channels operate independently with individual scaling values. You can configure each channel for different engineering units. Four green LEDs show active output signals on each channel. A red fault LED indicates overcurrent or open circuit conditions. The module automatically detects field wiring errors.
Installation and Environmental Requirements
This module draws 180 mA from the 5V DC backplane supply. It also draws 50 mA from the 24V DC supply for output power. Use shielded cable for analog outputs to minimize electrical noise. Connect the shield drain wire to the ground terminal only. Operating temperature ranges from 0°C to 60°C reliably. Keep humidity below 95% without condensation for long life. The removable terminal block simplifies wiring changes without removing the module.
Details
| Weight | 0.2 kg |
|---|---|
| Dimensions | 85 × 65 × 30 mm |
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