The 1756-IB32 is a 32-point digital DC input module from Rockwell Automation's Allen-Bradley ControlLogix series.
It is used to acquire digital signals from field sensors, switches, buttons, and other devices, and convert them into signals that the controller can process. This module features a high-density design, occupying only one slot, significantly saving rack space.
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Core Features
- ✓ 32 Digital Inputs: Provides 32 independent input channels, divided into 2 groups of 16 points each, allowing simultaneous acquisition of multiple digital signals.
- ✓ Wide Voltage Range: Supports input voltages from 10-31.2 VDC, with a nominal voltage of 24 VDC, adaptable to various industrial field devices.
- ✓ Configurable Input Filtering: Supports user-selectable filtering times (0, 1, 2, 9, 18 ms), effectively suppressing signal noise.
- ✓ LED Status Indicators: Each input channel is equipped with an independent status indicator light, and also displays the module's health status for easy on-site diagnostics.
Technical Specifications
| Brand |
Allen Bradley
|
| Model / Part Number |
1756-IB32 |
| Input Points |
32 points, divided into 2 groups (16 points per group) |
| Input Voltage Range |
10 - 31.2 VDC (nominal 24 VDC) |
| Input Type |
Sink Input |
| Input Delay (Hardware) |
OFF→ON: 380 µs max; ON→OFF: 420 µs max |
| Programmable Filtering Time |
OFF→ON: 0, 1, 2 ms; ON→OFF: 0, 1, 2, 9, 18 ms |
| Backplane Current Consumption |
120 mA @ 5.1V DC; 2 mA @ 24V DC |
| Power Consumption (Max) |
6.2 W @ 60°C |
| Heat Dissipation |
21.1 BTU/hour @ 60°C |
| Operating Temperature |
0°C to +60°C |
| Mounting Method |
ControlLogix rack mount, occupies 1 slot |
| Compatible RTB Terminal Block |
1756-TBCH or 1756-TBS6H |
Frequently Asked Questions
Q: What types of field devices can the 1756-IB32 connect to?
A: It can connect to various digital output devices, such as limit switches, proximity switches, photoelectric sensors, pushbuttons, selector switches, relay contacts, etc. It converts the ON/OFF state of these devices into logic signals that the controller can read.
Q: How do I set the input filter time on the 1756-IB32? What is its purpose?
A: The input filter time can be configured individually for each input group using programming software (such as Studio 5000). Optional filter times include 0, 1, and 2 ms (rising edge) and additional 9 and 18 ms (falling edge). Setting the filter time can effectively eliminate erroneous signals caused by switch bounce or electrical noise, ensuring stable and reliable input signals. For fast-response applications, a shorter filter time can be selected; for environments with interference, a longer filter time should be selected.
Q: In which racks can the 1756-IB32 be installed? What accessories are required?
A: It has good compatibility. This module occupies one slot and can be installed in any standard ControlLogix 1756 series rack (including 1756-A17, A13, A10, A7, A4, etc.). A removable terminal block (RTB), model 1756-TBCH or 1756-TBS6H, is required for installation to connect field signal cables.
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