Siemens SIMATIC S7-1500R/H Equipment Manual page 33

RUN/STOP LED
LED lit green
LED lit green
LED lit green
LED lit green
1) If there is not enough storage space on a SIMATIC Memory Card or on both SIMATIC Memory Cards in RUN-Redundant, the
write function is aborted and the redundant system continues operation with the original configuration. The redundant
system will remain in the RUN-Redundant system state.
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
LED displays in redundant operating state
In the RUN-Redundant system state, the LED displays on both CPUs are identical (exception:
you are performing an LED flash test on one CPU).
Meaning of LINK RX/TX LED
Each port of the X1, X2, X3 and X4 interfaces has a LINK RX/TX LED. The table below shows
the various LED patterns of the ports of the CPU 1517H‑3 PN.
Table 5-2 Meaning of LINK RX/TX LED
LINK TX/RX LED
Off
CPU 1517H-3 PN (6ES7517-3HP00-0AB0)
Equipment Manual, 11/2022, A5E42011886-AD
ERROR LED
LED off LED lit yellow
LED off
LED flashes red
LED lit yellow
LED flashes red
There is no connection between the interface of the device and a communication partner.
No data is currently being sent/received via the interface.
There is no LINK connection.
The redundancy connections were interrupted.
Interrupts, diagnostics, error messages and system events
MAINT LED
Maintenance demanded for the plant.
You need to check/replace the affected hardware
within a short period of time.
The primary CPU is in the RUN or RUN-Syncup oper­
ating state.
Active Force job
The CPU is in RUN-Redundant operating state.
LED off
There are no events, requirements, errors, etc.
A diagnostic event is pending in RUN-Redundant
LED off
operating state.
A diagnostic event (e.g. failure of an IO device with­
in the PROFINET ring or no access to SIMATIC
memory card possible
demanded (e.g. interruption of the PROFINET ring).
Meaning
5.1 Status and error display of the CPU
Meaning
1)
) and maintenance is
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