Siemens SIMATIC S7-155R/H Equipment Manual page 28

Block diagram
The following figure shows the block diagram of CPU 1518HF-4 PN.
① SIMATIC memory card (X50)
② Display
③ Mode selector RUN/STOP/MRES
④ Electronics
⑤ PROFINET 2-port switch
⑥ Synchronization interface
⑦ Backplane bus connection
(connection to backplane bus not
configurable)
⑧ Internal supply voltage
⑨ Supply of the 24 V DC supply voltage (X80)
PN X1 P1 R PROFINET interface X1 port 1
PN X1 P2 R PROFINET interface X1 port 2
Figure 3-4 Block diagram of CPU 1518HF-4 PN
CPU 1518HF-4 PN (6ES7518-4JP00-0AB0)
Equipment Manual, 05/2021, A5E49868646-AA
PN X2 P1 PROFINET interface X2 port 1
PN X3 P1 PROFINET interface X3 Port 1
HSYNC X4 P1 H-Sync interface X4 port 1
HSYNC X5 P1 H-Sync interface X5 port 1
L+ 24 V DC supply voltage
M Ground
R/S RUN/STOP LED (yellow/green)
ER ERROR LED (red)
MT MAINT LED (yellow)
X1 P1, X1 P2, X2 P1, LED Link TX/RX
X3 P1, X4 P1, X5 P1
Connecting
3.1 Terminal assignment
27