LEDs on the basic CPU module

Display

LED

Meaning

LEDs on the basic CPU module 1:

PWR

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

TC

TwinCAT status LED TwinCAT is in Run mode (green)
TwinCAT is in Stop mode (red)
TwinCAT is in Config mode (blue)

HDD

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

FB1

Status LED1 for fieldbus (function is written at the fieldbus interface)

FB2

Status LED2 for fieldbus (function is written at the fieldbus interface)