Description:

The Allen‑Bradley 1756‑IB16 ControlLogix digital input module is used in industrial automation systems to acquire discrete field signals and interface them with a ControlLogix programmable controller. Commonly installed in 1756 ControlLogix chassis and control cabinets to read inputs from sensors, switches, and discrete signals. Maintenance teams and system integrators use this module for I/O expansion, control upgrades, and replacement of failed input modules.

Applications:

The Allen-Bradley 1756‑IB16 module is widely used in factory and process automation environments requiring reliable acquisition of 24 VDC discrete signals. It is commonly found in conveyor systems, packaging machinery, material handling equipment, assembly lines, and safety interlock systems where proximity sensors, limit switches, and pushbuttons provide status data to PLC logic for monitoring and control.

Technical Specifications:

• Model: 1756‑IB16
• Module type: Digital input interface for ControlLogix
• Number of input points: 16 discrete inputs
• Input voltage: 24 VDC
• Input type: Sinking/sourcing compatible
• Connection: Screw terminal field wiring
• Mounting: 1756 ControlLogix chassis slot
• Current per channel: ~2–5 mA (standard logic)
• Indicators: Individual input status LEDs
• Response time: Typical industrial logic response
• Protection: Transient suppression and short‑circuit protection (platform dependent)
• Compatibility: Allen‑Bradley ControlLogix PLC family
• Operating temperature: Industrial range

Common Replacements:

• Allen‑Bradley 1756‑IB32 (32‑point input)
• Allen‑Bradley 1734‑IB16 (Flex I/O input module)
• Siemens 6ES7321‑1BL00‑0AA0 (SM321 input module)