Siemens SIMATIC S7-1500 Manual page 45

Connecting up
Note
PROFINET interface X3 with a transmission rate of 1000 Mbps
The PROFINET interface X3 supports a maximum transmission rate of 1000 Mbps.
Requirements:
• Devices on the PROFINET segment must support the 1000 Mbps transmission rate.
• The network infrastructure (network cables and outlets) must be category CAT 5e or
higher.
• The "Transmission rate" parameter in the properties of the port (X3) must be set as follows
in STEP 7:
– The "Autonegotiation" check box is selected
– "Automatic" is selected in the drop-down list
PROFIBUS interface X4
The table below shows the terminal assignment of the PROFIBUS interface. The assignment
corresponds to the standard assignment of an RS485 interface.
Table 3- 2
Note
Supply of I/O devices
The CPU 1518-4 PN/DP MFP does not provide a 24 V DC power supply on the PROFIBUS
interface. I/O devices (for example, PC adapter USB 6ES7972-0CB20-0XA0) are only
operational on the interface in conjunction with a plug-in power supply set for external
power supply.
The innovative successor product, PC adapter USB A2, receives the required power supply via
the USB port. This means it does not need a 24 V DC supply voltage and can be operated
without a plug-in power supply set for external power supply.
44
PROFIBUS interface terminal assignment
View
1
2
3
4
5
6
7
8
9
Signal name
- -
- -
RxD/TxD-P Data line B
RTS Request To Send
M5V2 Data reference potential (from station)
P5V2 Supply plus (from station)
- -
RxD/TxD-N Data line A
- -
CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
Equipment Manual, 07/2021, A5E40882737-AB
Designation