- Provides sixteen isolated input channels for 125 V DC field signals
- Supports both sinking and sourcing circuit arrangements
- Offers configurable filters, change-of-state reporting, and timestamps
1756-IH16I addresses a voltage class that is materially different from common 24 V DC ControlLogix input modules. Its isolation and terminal practices should be treated as part of the product selection.
Response behavior is configurable. When servicing an existing rack, compare channel filters and controller timing before attributing a slower state change to the replacement hardware.
Before installation, verify 125 V DC field compatibility, channel polarity, the approved high-voltage RTB, isolation wiring, input filters, electronic keying, and the saved channel schedule.
Availability, condition, price, and shipping time for 1756-IH16I are confirmed during quotation.
Allen-Bradley 1756-IH16I ControlLogix 16-Point Individually Isolated 125 V DC Input Module Manuals, Datasheets, Links
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
- Use only with documented 90 to 146 V DC field circuits
- Confirm sink/source polarity before terminating each isolated channel
- Do not substitute a 24/48 V DC input module based on chassis fit
- Restore off-to-on and on-to-off filter selections
- Coordinate change-of-state and cyclic updates with the controller task
- Account for the configured filter when evaluating response time
- Maintain the specified input-to-backplane isolation boundary
- Preserve individual input-channel isolation in field wiring
- Use the documented high-voltage RTB and conductor practice
- Individually isolated monitoring of 125 V DC status circuits
- High-voltage DC interlock and permissive inputs
- ControlLogix field-status acquisition requiring channel-to-channel isolation