The Allen Bradley 1756-IB16D is a ControlLogix DC digital I/O module. 16 diagnostic inputs, with 4 points in a group, are available for this particular input module. Compatible with the 1756 ControlLogix chassis, it requires an RTB, or removable terminal block, housing that is either the 1756-TBNH or 1756-TBSH only.
As with other diagnostic modules, the 1756-IB16D is intended to provide additional information to the controller, such as no load detection, a timestamp of the time a module fault occurs or clears up, and pulse tests. Note that this module does not indicate a blown or removed fuse for its wire off diagnostic function.
The 1756-IB16D has an operating voltage range of 10 to 30V DC and a voltage category of 12/24V DC sink, with a nominal input voltage of 24V DC. It has an input delay time of 340µs nominally or up to 1 ms hardware delay time plus the user selectable filter time (0, 1, or 2 ms) for the ‘off’ to ‘on’ state. The ‘on’ to ‘off’ input delay time is 740 µs nominally or up to 4 ms hardware delay time plus the user selectable filter time of either 0, 1, 9, or 18 ms. It has a total backplane power of 0.84W, a maximum power dissipation of 5.8W at 60 Degrees Celsius, and a maximum thermal dissipation of 19.78 BTU/hour. During an off-state, the 1756-IB16D has a maximum voltage of 5W and a maximum current of 1.5 mA. When in an on-state, the current ranges from 2 mA at 10V DC to 13 mA at 30V DC. Additionally, its maximum inrush current is 250 mA.
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| Manufacturer | Rockwell Automation |
| Brand | Allen Bradley |
| Part Number/Catalog No. | 1756-IB16D |
| Series | ControlLogix |
| Module Type | Digital DC Input Module |
| Inputs | 16 Diagnostic Inputs |
| Input Voltage | 12-24 Volts DC Sink |
| Operating Voltage Range | 10-30 Volts DC |
| Input Delay Time | 4 milliseconds plus selected filter time |
| Minimum Operating Current | 2 milliamperes at 10 Volts DC |
| Maximum Operating Current | 13 milliamperes at 30 Volts DC |
| Maximum Input Current, Off-State | 1.5 milliamperes per point |
| Power Dissipation (Max) | 5.8 Watts at 60 degrees Celsius |
| Backplane Current at 5 Volts | 150 milliamperes |
| Removeable Terminal Block(s) | 1756-TBCH, 1756-TBS6H |