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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 mode

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 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

Note

"LED" instruction

You can read the status (e.g. "On" or "Off") of LEDs of a CPU or a module using the "LED"

instruction. Note, however, that it is not possible to read the LED status of the LINK RX/TX

LEDs on all S7-1500 R/H CPUs.

You can find additional information on the "LED" instruction in the STEP 7 online help.

CPU 1515R-2 PN (6ES7515-2RM00-0AB0)

Equipment Manual, 11/2019, A5E42009914-AB

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.

Note that the human eye perceives this LED image as an LED that is lit yellow or flickering

yellow.

Interrupts, diagnostics, error messages and system events

4.1 Status and error display of the CPU

Meaning