CP 443-1 Advanced (GX30) 
Manual, 03/2019, C79000-G8976-C256-05 
49 
 
The display on the front panel consists of the following LEDs that indicate the operating 
mode and communications status. 
 
Figure 4-1  LEDs front panel CP 443-1 Advanced 
The LEDs have the following meaning: 
●  INTF: Internal error 
●  EXTF: External error 
●  BUS1F: Gigabit interface bus fault 
●  BUS2F: PROFINET interface bus fault 
●  TXD: Frame traffic (sending) over Ethernet 
(not relevant for PROFINET IO data) 
●  RXD: Frame traffic (receiving) over Ethernet 
(not relevant for PROFINET IO data) 
●  MAINT: Maintenance necessary (diagnostics buffer) 
●  RUN: RUN mode 
●  STOP: STOP mode 
●  X1P1: Link status / activity of the port of the gigabit interface 
●  X2P1, X2P2, X2P3, X2P4: Link status / activity of PROFINET port 1, 2, 3, 4