Rear View Of The Cpu; Mode Selector Switch - Siemens SIMATIC S7-1500 Manual

2.5.3

Rear view of the CPU

The following figure shows the connection elements on the rear of the
CPU 1518-4 PN/DP MFP.
①
②
③
Figure 2-7
2.6

Mode selector switch

You use the mode selector to:
• Request a change to a specific operating state
• Disable or enable the change to a specific operating state
(if, for example, the mode selector is set to STOP, 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 position of the switch and the corresponding meaning.
Table 2- 6 Mode switch settings
Position Meaning
RUN RUN mode
STOP STOP mode
MRES Memory reset
CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
Equipment Manual, 07/2021, A5E40882737-AB
Shield contact surfaces
Backplane bus connector
Fixing screws
View of the CPU 1518-4 PN/DP MFP – rear
Explanation
The CPU has permission to go to RUN.
The CPU does not have permission to go to RUN.
Position for CPU memory reset.
Product overview
2.6 Mode selector switch
41