
SLC 12 Point Combination Module
The 1746-IO12DC SLC 500 Digital I/O Combination Module by Allen-Bradley is an input/output combination module with six 24V DC inputs and six 100-120V AC relay contact outputs and is located on any slots of the SLC 500 chassis except the 0 chassis. It has 6 inputs and 6 points per common and an input voltage range between 10 and 30V DC. It also has 6 relay contact outputs with an operational voltage range between 5 and 265V AC at 47-63 Hertz and 5 and 125V DC at 47-53 Hertz. It draws a backplane current of 0.08A at 5V DC and 0.06A at 24V DC and has a signal delay time of 45ms for OFF and 35ms for ON state.
Application Areas

1. Discrete manufacturing equipment signal acquisition
As a 12-point DC input module, 1746-IO12DC is widely used in sensor signal acquisition of automated production lines, such as state detection of photoelectric switches and proximity switches. In the automotive welding production line, the fixture in-place signal can be monitored in real time to ensure the precise operation of the welding robot. A customer case shows that the equipment fault diagnosis efficiency is improved by 35% after the module is adopted.
2. Logistics sorting system control
On the express sorting line, the module is used to read the trigger signals of the weighing sensor and barcode scanner, and cooperate with the PLC to realize the package path allocation. Its 15ms fast response characteristics meet the high-speed sorting requirements. After deployment in a logistics center, the sorting error rate is reduced to 0.02%.
3. Intelligent transformation of traditional equipment
For the relay control transformation of old machine tools and packaging machinery, the module can be directly connected to the original 24VDC limit switch, retaining the mechanical structure while realizing PLC control. A food packaging machine transformation project proves that the solution saves 60% of the cost compared to the replacement of the entire equipment.
Technical specifications
| Manufacturer | Rockwell Automation |
| Brand | Allen-Bradley |
| Part Number/Catalog No. | 1746-IO12DC |
| Series | SLC 500 |
| Module Type | Digital I/O Combination Module |
| Operating Voltage | 10-30 Volts DC |
| Inputs | 6 |
| Outputs | 6 |
| Signal delay | 8 milliseconds |
| Current/Output (24VDC) | 1.2 amps |
| Current/Output (120 VAC) | 1.5 amps |
| Backplane Current | 60-80 milliamps |
| Applications | Combination 24 Volts DC I/O |
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