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

Interrupts, error messages, diagnostics and system
alarms
The status and error displays of the CPU 1516T-3 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 (https://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 1516T‑3 PN/DP.
①
②
③
④
⑤
⑥
Figure 5-1 LED display of the CPU 1516T-3 PN/DP (without front panel)
Meaning of the RUN/STOP, ERROR and MAINT LEDs
The CPU 1516T-3 PN/DP has three LEDs to signal the current operating status and diagnostics
status. The following table shows the meaning of the various combinations of colors for the
RUN/STOP, ERROR and MAINT LEDs.
Table 5-1 Meaning of the LEDs
RUN/STOP LED
LED off
34
RUN/STOP LED (yellow/green LED)
ERROR LED (red LED)
MAINT LED (yellow LED)
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 X2 P1 (yellow/green LED)
ERROR LED
LED off
MAINT LED
Missing or insufficient power supply on the CPU.
LED off
Meaning
CPU 1516T-3 PN/DP (6ES7516-3TN00-0AB0)
Equipment Manual, 11/2022, A5E40898375-AC
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