Siemens Simatic S7-1500 CPU 1512C-1 PN Panduan Peralatan - Halaman 36

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Interrupts, error messages, diagnostics and system alarms

5.1 Status and error display of the CPU

RUN/STOP LED

LED flashes

yellow/green

Meaning of LINK RX/TX LED

Each port has a LINK RX/TX LED. The table below shows the various "LED scenarios" of the CPU

ports.

Table 5-2 Meaning of the LEDs

LINK TX/RX LED

LED off

LED flashes green

LED lit 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 CPUs.

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

Meaning of the STOP ACTIVE LED

The following table shows the meaning of the STOP ACTIVE LED of the CPU.

Table 5-3 Meaning of the LEDs

STOP ACTIVE LED

LED lit yellow

ERROR LED

LED flashes red

LED flashes yellow

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 "LED flashing test" is being performed.

There is an Ethernet connection between the PROFINET interface of your PROFINET device and

a communication partner.

Data is currently being received from or sent to a communications partner on Ethernet via the

PROFINET interface of the PROFINET device.

The CPU is switched to "STOP" mode using the STOP button.

•

As long as the STOP ACTIVE LED is lit up, switching the CPU to RUN mode is only possible

using the RUN button.

•

The CPU can then no longer be set to RUN mode via the display operation or via online func

tions. The state of the buttons is retained at power-off. If the CPU does not start up automat

ically after a power-on, you have to keep the STOP button pressed during start-up until the

STOP ACTIVE LED is activated.

•

If an automatic start-up is to be reliably prevented after a power-up, the STOP button has to

be kept pressed during the start-up of the CPU until the STOP ACTIVE LED is activated.

MAINT LED

Startup (CPU booting)

Test of LEDs during startup, inserting a module.

LED flashing test

Meaning

CPU 1511-1 PN (6ES7511-1AL03-0AB0)

Equipment Manual, 11/2022, A5E40869673-AC