Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | ALLEN-BRADLEY 1756-IC16 |
| Manufacturer | Rockwell Automation (Allen-Bradley) |
| Product Type | ControlLogix Digital Input Module |
| Number of Channels | 16 (2 groups of 8) |
| Input Voltage Range | 30–60 VDC |
| Nominal Voltage | 48 VDC |
| Input Type | Current Sinking (Sink) |
| Isolation | 250 V continuous between groups of 8 inputs |
| Terminal Block | 20-pin RTB (1756-TBNH or 1756-TBSH) |
| Communication Format | Input Data / CST Timestamped Input Data |
| Filter Times (OFF→ON) | 0, 1, 2 ms (DC) |
| Filter Times (ON→OFF) | 0, 1, 2, 9, 18 ms (DC) |
| Change of State | Configurable per point |
| Country of Origin | Malaysia |
| Standard Warranty | 1 year |
Main Features and Advantages
Dedicated 48V DC input capability: The ALLEN-BRADLEY 1756-IC16 fills a specific niche within the ControlLogix I/O portfolio by accommodating 30–60V DC signals directly, without requiring external signal conditioning or voltage dividers. This eliminates an entire layer of interface hardware in systems where 48V DC control voltages are specified, reducing panel space, wiring complexity, and potential failure points. For retrofit projects replacing legacy relay panels that operated at 48V DC, the 1756-IC16 allows the existing field wiring to be retained while migrating the control logic to a modern PLC platform.
Group isolation for fault containment: With 250V continuous isolation between the two groups of eight inputs, the 1756-IC16 prevents a fault on one signal group from affecting the other. In practical terms, this means a wiring error or voltage transient on one set of field devices will not corrupt the input readings of the second group, preserving partial system visibility even during fault conditions. This isolation architecture is particularly valuable in distributed control panels where multiple subsystems share a common chassis but derive their field signals from separate power sources or grounding domains.
Advanced diagnostic and timestamping support: The 1756-IC16 supports the CST Timestamped Input Data communication format, which attaches coordinated system time stamps to input transitions and diagnostic events . This allows the controller to reconstruct the precise sequence of events during fault analysis, even when multiple input changes occur between program scans. The module also reports a fault status word that aggregates open-wire, field power loss, and communication fault conditions, giving maintenance personnel a single diagnostic register to consult when a channel behaves unexpectedly.
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