S5-115F Manual
System Startup
Central Processing Unit
The following operator functions are possible on the front panel of the CPU:
•
Plug in a memory submodule
•
Connect a programmer (PG)
•
Connect SINEC L1
•
Select the operating mode
•
Perform an Overall Reset
LEDs indicate the current CPU operating mode. A slot in the CPU front panel contains a plastic card
with the most important operating instructions for the PS and CPU. Figure 4-2 shows the front of
the CPU.
Receptacle for memory submodule
Control
panel
Instruction
card
Connectors for PG or SINEC L1 LAN
Fault
LEDs
QVZ:
Time-out
ZYK:
Scan time exceeded
BASP: Command output disable
RN
ST
RN
ST
OR
QVZ
ZYK
BASP
115F
CPU
942
Figure 4-2. Front View of the CPU
EWA 4NEB 811 6148-02
4-3