I/O LEDs¶
Each CPU contains up to 15 LEDs (depending on type) to display the statuses of the inputs and outputs.
| CPU type | LED | Status | Color | LED = ON | LED = OFF |
PM554 PM564 |
I0 … I7 (PM554) I0 … I5 (PM564) |
Digital input | yellow | Input is ON | Input is OFF |
| O0 … O5 | Digital output | yellow | Output is ON | Output is OFF | |
| PM564 | AI0, AI1* | Analog input | yellow | Input is ON | Input is OFF |
| AO | Analog output | yellow | Output is ON | Output is OFF |
* The analog inputs AI0 and AI1 can be configured as digital input or analog input.