Rear View Of The Cpu; Operating Mode Buttons - Siemens SIMATIC S7-1500 Manual

3.5.3

Rear view of the CPU

The following figure shows the connection elements on the rear of the CPU 1516-3 PN/DP.
①
②
③
④
Figure 3-6 View of the CPU 1516-3 PN/DP - rear
3.6

Operating mode buttons

You use the operating mode buttons to:
• Request a change to a specific operating state
• Disable or enable the change to a specific operating state
(if the operating mode button STOP is active, for example, you cannot switch the CPU to
RUN via a communication task configured in the TIA Portal or via the display)
The following table shows the meaning of the corresponding operation of the operating
mode buttons.
Table 3-6 Meaning of the operating mode buttons
Operation of the operating mode but­
tons
RUN
STOP
1. Press the operating mode button
STOP.
Result: The RUN/STOP LED lights up
yellow.
CPU 1516-3 PN/DP (6ES7516-3AP03-0AB0)
Equipment Manual, 11/2023, A5E46418484-AD
Shield contact surfaces
Plug-in connection for power supply
Plug-in connection for backplane bus
Fixing screws
Meaning
RUN mode
STOP mode
Manual memory reset
(with SIMATIC memory card
inserted)
or
Reset to factory settings
(without inserted SIMATIC
memory card)
3.6 Operating mode buttons
Explanation
The CPU has permission to go to RUN.
The CPU does not have permission to go to RUN.
The CPU is executing a memory reset.
or
The CPU is being reset to factory settings.
You can find additional information in the
S7-1500/ET 200MP system manual
Product overview
31