LEDs Basic CPU-Module

PWR

Power supply
The Power LED comes on when the device is connected to a live power supply unit.

LAN 1

LAN Link , (green)

LINK/ACTIVITY for switched LAN PORT 1 (CX1020-N000)

LAN 2

LAN Link, (green)

LINK/ACTIVITY for switched LAN PORT 2 (CX1020-N000)

TC

TwinCAT Status LED

TwinCAT is in Run-Mode (green)
TwinCAT is in Stop-Modus (red)
TwinCAT is in Config-Mode (blue)
(in HW revision < 2.0 the Config-Mode is displayed by blinking green)

HDD

Read/Write Compact Flash (red)
Indicates access to the CF card.