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The Allen-Bradley 1756-IA8D is a high-performance diagnostic AC input module designed for integration within the ControlLogix platform. This module provides 8 diagnostic inputs, enabling advanced monitoring capabilities that allow for proactive fault detection and system maintenance in demanding industrial environments.
This diagnostic module is engineered for use in applications where input signal integrity and status monitoring are critical. It is commonly deployed in manufacturing lines, power generation control systems, and automated process control environments where diagnostic feedback helps reduce downtime by identifying field-side wiring or signal issues quickly.
| Product Model | 1756-IA8D |
| Module Type | Diagnostic Input Module |
| Input Points | 8 Diagnostic |
| Nominal Input Voltage | 120V AC |
| Operating Voltage Range | 79-132V AC |
| Input Delay Time | Programmable (9 or 18 ms) |
| Min. Operating Current | 5 mA at 79V AC |
| Max. Operating Current | 16 mA at 132V AC |
| Max. Off-State Current | 2.5 mA |
What is the primary advantage of the 1756-IA8D over a standard input module?
The 1756-IA8D includes diagnostic functionality that allows the controller to detect specific fault conditions, such as open or short circuits, which standard modules cannot identify.
Can the input delay be adjusted?
Yes, the input delay is software-programmable to either 9 or 18 milliseconds, allowing you to tune the module to reject noise or accommodate slower signal transitions.