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| Illustration 1 | g00795767 |
The system of the programmable logic controller (PLC) is shown with the processor and the base assembled.
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The programmable logic controller (PLC) consists of the following components:
- Controller
- Base
- Input module
- Output module
The processor has a memory module and a battery backed up RAM. The memory module stores the program for the annunciator. The processor attaches to the inside of the base.
The base is powered by 24 DCV. The base is equipped with 16 inputs. The base is also equipped with 12 outputs (6 relay and 6 FET). The status of the inputs and outputs are displayed on the front of the base. The status is represented by LED indicators.
The system is equipped with an input module which adds 16 additional inputs in order to increase the capacity of the PLC. An input is active whenever 24 VDC is applied to that input. The status of each input is displayed on an LED indicator on the module.
The system is equipped with an output module which adds 16 additional outputs in order to increase the capacity of the PLC. The outputs are sourcing drive outputs that use 24 DCV. An output is active whenever 24 DCV is being supplied to the load that is attached to that output. The status of each output is displayed on an LED indicator on the module.
Refer to the Tables 1 and 2 for descriptions on the LED indicators.
| LED | Color | Indication |
|---|---|---|
| "POWER" | off | no input power |
| green | The power is on. | |
| "RUN" | off | The controller is not running in the "Run" mode or the "REM" mode. |
| green | The controller is running in the "Run" mode or the "REM" mode. | |
| green flashing | The controller is running in the "Run" mode. The memory module is transferring data. |
|
| "FAULT" | off | no faults |
| red flashing | The program has a fault. | |
| red | hardware fault | |
| "FORCE" | off | no forces |
| amber | forces are installed. | |
| "BATTERY LOW" | off | The battery is okay. |
| red | The battery needs to be replaced. | |
| "COMM 0" | off | no communication |
| green | communications are active. | |
| "COMM 1" | off | no communication |
| green | communications are active. | |
| "DCOMM" | off | user-defined communications are active. |
| green | default communications are active. | |
| INPUTS | off | input is not energized. |
| amber | input is energized. | |
| OUTPUTS | off | output is not energized. |
| amber | output is energized. |
| LED | Error | Probable cause | Recommended Action |
|---|---|---|---|
| All LED indicators are off. | No input power | No line voltage is present. | Verify the line voltage and the connections to the controller. |
| Power supply is overloaded. | This problem can occur intermittently when the outputs are overloaded. | ||
| The "Power" LED is on and the "FAULT" LED is on. | Hardware has a fault. | hardware has an error. | Cycle the power. If the problem continues, replace the hardware. |
| Wiring is loose. | Verify the connections to the controller. | ||
| The "Power" LED is on and the "FAULT" LED is flashing. | The application has a fault. | A hardware fault is detected or a software fault is detected. | Cycle the power. Remove the hardware that is causing the fault. If the problem continues, replace the hardware. |