1771-QB/C

Product Overview

Allen-Bradley 1771-QB/C is a linear positioning module for PLC-5 systems, supporting precise analog and discrete I/O for motion control applications in a single 1771 universal I/O chassis slot.

Sampling and Motion

• Sampling period: 2 ms for both loops

• Maximum velocity: 327.67 in/s (3276.7 mm/s)

Analog Output

• Switchable ranges: ±10 VDC @ up to 10 mA, ±20 mA (up to 600 Ω), ±50 mA (up to 240 Ω), ±100 mA (up to 120 Ω)

• Resolution: 12-bit

Transducer Interface

• Maximum stroke length: 180 in (4572 mm)

• Resolution: 0.002 in per circulation

• Drivers/Receivers: RS422

• External interrogation: 3 µs pulse width

• Single gate pulse: 1.680 ms max, 117 MHz internal counters

Discrete Inputs

• Logic 0 voltage: 0–4 VDC

• Logic 1 voltage: 10–30 VDC

• Input current: 8 mA @ 12 VDC, 16 mA @ 24 VDC

Discrete Outputs

• Type: Single-ended source

• Logic 0: No voltage (OFF)

• Logic 1: User-supplied voltage (ON)

• Maximum source drive: 100 mA (ON)

• Maximum source leakage: 1 mA (OFF)

Backplane Requirements

• Current: 1.6 A max, 1.1 A typical @ +5 VDC

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