Allen Bradley 1756-LSC8XIB8IK

The Allen Bradley 1756‑LSC8XIB8IK is an 8-channel isolated counter input and digital I/O module from the ControlLogix series.

Technical Specifications

• Model: 1756‑LSC8XIB8IK
• Type: Low-speed counter / digital input module (8 channels)
• Voltage Range: 10–30 V DC
• Cyclic Update Time: 0.2 ms
• Input Current: 5 mA ON @ 30 V; 1.5 mA OFF max
• Backplane Draw: 275 mA @ 5.1 V; 3 mA @ 24 V
• Input Impedance: 6 kΩ @ 30 V DC
• Isolation Voltage: 250 V DC between channels and backplane
• Counting Frequency: Up to 40 kHz
• Count Range: 0–2,147,483,648 (31-bit)
• Operating Temperature: 0–60 °C; Storage: –40–85 °C
• Shock/Vibration: 30 g shock, 2 g vibration
• Certifications: UL, CE, ATEX, IECEx, RCM
• Conformal Coating: Yes (IK variant)

Key Features

• 8 individually isolated low-speed counters with 12-bit resolution
• Capability to function as standard digital inputs or counters
• Fast response with 0.2 ms update; supports up to 40 kHz count speed
• LED indicators for each input and counter status
• Conformal coating protects against moisture, dust, and corrosion

Compatible Components & Accessories

• ControlLogix chassis and DC power supplies
• Requires 1756‑TBCH or TBS6H removable terminal block, or 1492 interface module
• Compatible with Studio 5000 & PanelView Plus HMIs

Industry Applications

• Counting pulses from encoders and flowmeters
• Material handling, batching, and part counting
• Position sensing and low-speed motion control
• Industrial environments with harsh conditions

Installation & Maintenance Notes

• Install in ControlLogix chassis using proper RTB or interface block
• Ensure correct wiring polarity for counter functionality
• LED indicators provide quick diagnostics for wiring and count faults
• Hot-swap capable using RTB—no need to disturb field wiring
• Follow chassis grounding/shielding guidelines per Rockwell wiring spec

Frequently Asked Questions