Siemens Simatic S7-400 - Page 27

LEDs and connectors
2.2 Power supply
CP 443-1 OPC UA
Operating Instructions, 01/2017, C79000-G8976-C427-02
27
INTF
(red)
EXTF
(red)
BUSF
(red)
SERVER
(green)
CLIENT
(green)
RUN
(green
)
STOP
(yel-
low)
Meaning
Firmware update
Firmware activation during startup:
- - Loading using the Firmware Loader is active.
Note: Does not apply to loading via the update center in
Web diagnostics.
- - The firmware download was aborted.
(STOP LED and RUN LED flash alternately)
Communication status of the CP (TXD, RXD, X1P1)
LED
Display
Meaning
TXD
(green)
CP sending over Ethernet.
RXD
(green)
CP is receiving over Ethernet.
X1P1
(green / yellow)
Port has no connection over Ethernet.
Existing connection of the port to Ethernet
LED flashes yellow (constant light green): Port is sending /
receiving.
Permanent data traffic at the port
Module identification with flashing LED
With the help of Web diagnostics or the online functions of STEP 7, you can search for and
identify the module in the rack. The options for this are as follows:
● In Web diagnostics
You click the "Flash" button in the update center.
● In STEP 7
You click the "Flash" button in the "Browse network" dialog
When the "Identify" or "Flash" button is clicked, the port LED X1P1 flashes briefly.