Siemens SIMATIC NET S7-400 - LEDs; LED Display and Meaning

CP 443-1 (EX30)
Manual, 03/2019, C79000-G8976-C255-05
33
LEDs
4
LED display
The display on the front panel consists of 10 LEDs that indicate the operating mode and
communication status.
Figure 4-1 LEDs front panel CP 443-1 (EX30)
The LEDs have the following meaning:
● INTF: Internal error
● EXTF: External error
● BUSF: 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
● P1 / P2: Link status / activity of Ethernet port 1 / port 2