The Allen-Bradley 1771-DS is a latching input module that detects and latches pulses from 0.1 to 5.0 ms. It supports independent or paired inputs, edge/level detection, and selectable pulse capture times for precise industrial control.
SPECIFICATION
- Inputs：8
- Module Location:1771 I/O chassis
- Pulse Capture Time：0.1, 0.5, 1.0, 2.5, or 5.0 ms (selectable per channel)
- Input Voltage Range (Logic 1)：10 to 27V DC
- Input Voltage Range (Logic 0)：0 to 4V DC
- Reverse Voltage Protection：240V DC max
- Maximum Off-State Current：1mA @ 4V DC
- Nominal Input Current：20mA @ 27V DC typical
- Opto-Electrical Isolation：1500V
- Backplane Current：375mA typical
- Operating Temperature：0 to 60°C (32 to 140°F)
- Storage Temperature：-40 to 85°C (-40 to 185°F)
- Relative Humidity：5 to 95% (without condensation)
- Keying：Between 2 and 4; Between 18 and 20
Enviromental Strength
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Wide operating temperature range – Functions reliably from 0°C to 60°C (32°F to 140°F).
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Broad storage temperature tolerance – Withstands -40°C to 85°C (-40°F to 185°F).
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High humidity resistance – Operates at 5% to 95% relative humidity without condensation.
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Robust isolation – Provides 1500V opto-electrical isolation for noise immunity.
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Reverse voltage protection – Handles up to 240V DC reverse voltage without damage.
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ESD protection guidelines – Static-shield bag and safe handling prevent degradation.
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