Description
Overview
The Honeywell 621‑6501 is a high-reliability digital output module designed for the IPC 620 control system. It delivers eight individually protected 24 VDC transistor-based sourcing outputs with integrated fault monitoring, ensuring safe and dependable operation in demanding industrial environments.
Key Features
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Eight 24 VDC sourcing outputs with individual circuit fuses
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Self-protected outputs with real-time fault detection
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Transistor output monitoring compares controller command with actual output state
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Rugged design suitable for long-term industrial operation
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Ideal for driving solenoids, relays, indicator lights, and other discrete devices
Technical Specifications
| Parameter | Specification |
|---|---|
| Output Type | 24 VDC Sourcing Transistor |
| Number of Outputs | 8 Channels |
| Operating Voltage Range | 11–28 VDC |
| Maximum Current | 2 A per channel, 6 A per common, 8 A per module |
| Surge Current | 5 A for 10 ms (non-repetitive) |
| Off-State Leakage | ≤ 5 mA (typical) |
| On-State Voltage Drop | ≤ 2 VDC at 2 A load |
| Circuit Fusing | 1 × 3 A Fast-Blow Fuse per channel |
| Module Operating Current | +5 VDC: 70 mA + 5 mA per energized output (max 110 mA) |
| Dimensions | 1.2″ × 9.5″ × 6.8″ (3.0 cm × 24.1 cm × 17.3 cm) |
| Weight | 0.6 kg |
| Compatible Chassis | Honeywell IPC 620 |
Applications
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Industrial process control and monitoring
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Solenoid and relay actuation
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Indicator and alarm control systems
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Legacy Honeywell IPC/TDC systems
FAQ
Q: Can this module be used in systems other than IPC 620?
A: The 621‑6501 is specifically designed for IPC 620 chassis. Compatibility with other systems is not guaranteed.
Q: How is fault detection handled?
A: Each output is monitored for discrepancies between controller commands and actual transistor state. Any mismatch triggers a fault indicator.
Q: Are the outputs protected against overload?
A: Yes, each output has individual fusing and built-in self-protection to prevent damage in case of short circuits or overcurrent.
Comparison with Similar Modules
Compared to Honeywell 621‑6502 (16-channel version), the 621‑6501 offers lower channel density but identical self-protection and fault monitoring features, making it suitable for smaller-scale applications requiring high reliability.
Features
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