pLAN is the communication wire between unit 1 and unit 2 controller board. The units will act independently when the communication is lost.
Troubleshooting
| Possible Cause | Component to Check | Recommended Action |
| Single unit configuration | SYS under E menu | Change setting from 2 to 1 |
| Loose connector | pLAN connector on J6 block at each controller board | Push in connector |
| Incorrect Controller Address | CAD under E menu. CAD must be 1 for unit 1 and 2 for unit 2 | Correct setting. Move the display connector (J7) to unit 2 to configure unit 2 address |
| Controller board failure/power loss | 24VDC on across J1 Power supply LED light between J8 and J9 should be lit | Secure power input connector. Replace controller board is power is present but controller board does not power on. Refer to the Controller board LED status chart below. |
Controller board LED status
Power Supply LED (Yellow) | Description | ||
● | Indicates power supply to the module | ||
Status LED | |||
Red | Yellow | Green | Description |
◌ | ◌ | ◌ | Cannot identify other unit through pLAN: Loose pLAN connection OR wrong controller address |
● | ◌ | ◌ | Software error: No pLAN address set |
◌ | ● | ● | Module operating correctly with pLAN |