Description
Description
The Allen-Bradley 1756-IH16I is a high-performance digital input module designed for the ControlLogix platform. This module provides 16 individually isolated input points, offering robust signal processing for industrial applications requiring 125V DC inputs. Its isolated design ensures enhanced noise immunity and protection against ground loops between field devices and the backplane, making it a reliable choice for complex automation environments.
Features
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Isolated Inputs: Features 16 individually isolated points for superior signal integrity.
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Voltage Compatibility: Designed for 125V DC sink/source input applications.
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Operating Range: Supports a wide operating voltage range of 90 to 146V DC.
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Configurable Filtering: Includes a base input delay of 6 milliseconds, which can be extended via user-selectable filter times to suit specific process requirements.
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ControlLogix Integration: Fully compatible with the Allen-Bradley ControlLogix chassis and backplane communication protocols.
Technical Specifications
| Model Number |
1756-IH16I |
| Manufacturer |
Allen-Bradley |
| Input Count |
16 (Individually Isolated) |
| Nominal Input Voltage |
125V DC |
| Operating Voltage Range |
90 - 146V DC |
| Input Delay Time |
6 ms + selected filter time |
| Module Type |
Digital Input Module |
Installation Guidelines
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Power Status: Always disconnect power from the ControlLogix chassis before installing or removing the module.
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ESD Protection: Use a grounded wrist strap or similar ESD protection when handling the module to prevent damage to sensitive internal circuitry.
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Seating: Ensure the module is properly aligned with the chassis slot guides and firmly seated into the backplane connector.
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Wiring: Use appropriate shielded cabling for field inputs to minimize EMI interference. Ensure all terminal connections are secure and properly torqued.
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Ventilation: Maintain adequate clearance around the chassis to ensure sufficient airflow for cooling, as per the ControlLogix thermal management guidelines.
FAQ
Q: Is the 1756-IH16I compatible with standard ControlLogix chassis?
A: Yes, this module is designed for use in any standard Allen-Bradley ControlLogix I/O chassis.
Q: What does "individually isolated" mean for this module?
A: Each of the 16 input points is electrically isolated from the others and from the backplane, which helps prevent electrical noise or faults on one channel from affecting the others.
Q: Can I use this module for 24V DC signals?
A: No, the 1756-IH16I is specifically rated for 125V DC operation. Attempting to use it with lower voltage levels may result in improper operation or failure to detect the signal.
