Establishing The Rs485 Hardware Communication Connection - Siemens SIMATIC S7 System Manual

Getting started
2.1 Connecting to the CPU
Note
The CPU list will show all of the CPUs regardless of Ethernet network class and subnet.
To make a connection to your CPU, your Communication Interface (for Ethernet, a network
interface card (NIC)) and the CPU must be on the same class of network and on the same
subnet. You can either set up your network interface card to match the default IP address of
the CPU, or you can change the IP address of the CPU to match the network class and
subnet of your network interface card.
See the "Configuring or changing an IP address for a CPU or device in your project" for
information about how to accomplish this.
2.1.1.4

Establishing the RS485 hardware communication connection

The RS485 interfaces establish the physical connections between a programming device
and a CPU.
Follow the steps below to create the hardware connection between a programming device
and a CPU:
1. Install the CPU.
2. Plug the USB/PPI cable into the RS485 port on the bottom left of the CPU as shown
below.
3. Connect the USB/PPI cable to the programming device.
①
36
RS485 port
System Manual, V2.3, 07/2017, A5E03822230-AF
S7-200 SMART