Siemens S7-400 - Leds

CP 443-1 Advanced
Equipment Manual, 03/2023, C79000-G8976-C256-07
37
LEDs
4
LED display
The following LEDs on the front panel show the operating and communication status of the
CP:
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
Table 4- 1 Legend: Meaning of the LED symbols in the following tables
Symbol -
Meaning
ON
OFF
Flashing
Any