Siemens SIMATIC S7-1500R/H Manual page 31

Interrupts, diagnostics, error messages and system events
4.1 Status and error display of the CPU
Note
MAINT LED of the two CPUs
The MAINT LEDs of both CPUs only go out when the following conditions are fulfilled:
• The CPUs are in the RUN-Redundant system state.
• No maintenance is demanded.
Note
ERROR LED of the backup CPU
In non-redundant operation, the backup CPU does not establish a connection to the IO
devices. Therefore, in addition to the LED patterns shown in the "Meaning of the LEDs"
table, note that the ERROR LED of the backup CPU always flashes red in this state.
Note
LED displays in redundant mode
In the RUN-Redundant system state, the LED displays on both CPUs are identical.
Meaning of LINK RX/TX LED
Each port has a LINK RX/TX LED. The table below shows the various LED patterns of the
ports of the CPU 1515R-2 PN.
Table 4- 2 Meaning of LINK RX/TX LED
LINK TX/RX LED
off
Flashes green
Illuminated green
LED flashes
yellow/green
30
There is no Ethernet connection between the PROFINET interface of the PROFINET device
and the communication partner.
No data is currently being sent/received via the PROFINET interface.
There is no LINK connection.
The redundancy connections were interrupted.
The CPU performs an LED flash test.
There is an Ethernet connection between the PROFINET interface of your PROFINET de-
vice and a communication partner.
The redundancy connections are OK.
Data is currently being received/sent by a communication partner via the PROFINET inter-
face of the PROFINET device.
Meaning
CPU 1515R-2 PN (6ES7515-2RM00-0AB0)
Manual, 10/2018, A5E42009914-AA