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S5-115U Manual
The CPU controls are arranged in a panel. Figure 2-8 shows the control panel of the different
CPUs.
Mode selector STOP/RUN
RUN LED
STOP LED
Meaning of the LEDs
Two LEDs on the control panel of the CPU indicate the status of the CPU ( and in Figure 2-8).
Table 2-3 lists the possible indications.
A flashing or flickering red LED indicates PLC malfunctions (see Chapter 5).
Red
LED
EWA 4NEB 811 6130-02b
Figure 2-8. Control Panel of the Different CPUs
Table 2-3. Operating Mode LEDs
Green
LED
CPU is in cold restart routine or in RESTART mode
Technical Description
RN
ST
RN
ST
QVZ
ZYK
BASP
NR
RE
OR
Switch for the following RESTART settings:
•
nonretentive presetting (NR)
retentive presetting (RE)
•
overall reset (OR)
Error LEDs (QVZ, ZYK)
BASP (output disable); outputs of the
output modules are not enabled
Meaning
STOP mode
RUN mode
Program check running
2-13
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