Allen-Bradley 1756-IA8D ControlLogix Digital I/O Module

The Allen-Bradley 1756-IA8D is a ControlLogix Digital I/O module. 8 diagnostic inputs, with 4 points available per group, are in this AC input module. This module is suitable for a 1756 ControlLogix chassis and is only compatible with the 1756-TNBH or 1756-TBSH removable terminal block, or RTB. A unique feature of the 1756-IA8D is the Field Power Loss detection. When field power loss occurs to the module or zero cross cannot be detected, a point level fault is then sent to the controller. This allows the controller to find the exact point faulted, so make sure to enable this option only for points that are in use. If points not in use have the Field Power Loss detection activated, these points will be registered as faults during the operation and not as points not in use. Other configurable features of the 1756-IA8D include the Change of State, Input Filter Times, Open Wire Detection, Diagnostic Latching, and Diagnostic Change of State.

Technical specifications for 1756-IA8D

ManufacturerRockwell Automation

BrandAllen-Bradley

Part Number/Catalog No.1756-IA8D

SeriesControlLogix

Module TypeDiagnostic Input Module

Inputs8 Diagnostic

Input Voltage120 Volts AC

Operating Voltage Range79-132 Volts AC

Input Delay TimeProgrammable 9 or 18 milliseconds

Minimum Operating Current5 milliamperes at 79 Volts AC

Maximum Operating Current16 milliamperes at 132 Volts AC

Maximum Input Current, Off-State2.5 milliamperes

Power Dissipation (Max)4.5 Watts at 60 degrees Celsius