Interrupts, Error Messages, Diagnostics And System Alarms; Status And Error Display Of The Cpu - Siemens SIMATIC S7-1500 Manual

Interrupts, error messages, diagnostics and system
alarms
The status and error displays of the CPU 1518‑4 PN/DP are described below.
You will find additional information on "Interrupts" in the STEP​ 7 online help.
You can find additional information on the topics of "Diagnostics" and "System alarms" in the
Diagnostics (http://support.automation.siemens.com/WW/view/en/59192926) function
manual.
5.1

Status and error display of the CPU

LED display
The figure below shows the LED displays of the CPU 1518‑4 PN/DP.
①
②
③
④
⑤
⑥
⑦
⑧
Figure 5-1 LED display of the CPU 1518‑4 PN/DP (without front panel)
CPU 1518-4 PN/DP (6ES7518-4AP00-0AB0)
Equipment Manual, 11/2022, A5E32334527-AE
RUN/STOP LED (yellow/green LED)
ERROR LED (red LED)
MAINT LED (yellow LED)
No function
LINK RX/TX LED for port X1 P1 (yellow/green LED)
LINK RX/TX LED for port X1 P2 (yellow/green LED)
LINK RX/TX LED for port X3 P1 (yellow/green LED)
LINK RX/TX LED for port X2 P1 (yellow/green LED)
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