Alarm, error and system messages
4.1 Status and error display of the CPU
CPU 1518HF-4 PN (6ES7518-4JP00-0AB0)
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Equipment Manual, 05/2021, A5E49868646-AA
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, X4 and X5 interfaces has a LINK RX/TX LED. The table below
shows the various LED patterns of the CPU 1518HF-4 PN ports.
Table 4- 2
Meaning of LINK RX/TX LED
LINK TX/RX LED
Meaning
Off
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.
Flashes green
The CPU performs an LED flash test.
Illuminated green
There is a connection between the interface of the device and a communication partner.
The redundancy connections are OK.
LED flashes
yellow/green
Data is currently being received or sent by a communication partner via the interface of the
device.
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.
Содержание CPU 1518HF-4 PN
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