Cpu Communication Connections - Siemens SIMATIC S7 System Manual

Communication

8.1 CPU communication connections

8.1 CPU communication connections
The CPU supports the following maximum number of simultaneous, asynchronous
communication connections:
● Ethernet programming port:
– Open User Communication (OUC) connections: Eight active (client) connections and
– HMI/OPC connections: Eight dedicated HMI/OPC server connections.
– PG connections: One programming device (PG) connection.
– Peer-to-peer (GET/PUT) connections: Eight active (client) connections and eight
Note
You can program an S7-200 SMART CPU through the Ethernet port if your CPU model
supports it. Only one PG can monitor one CPU at a time.
Note
The S7-200 SMART CPU uses the GET and PUT instructions for CPU-to-CPU
communications.
Note
The CPU models CPU CR20s, CPU CR30s, CPU CR40s, and CPU CR60s have no
Ethernet port and do not support any functions related to the use of Ethernet
communications.
● Integrated RS485 port (Port 0): Four connections to support HMI devices and one
connection reserved for programming with STEP 7-Micro/WIN SMART.
Note
You can make the following RS485 communication connections:
• Use a USB-PPI cable to program all CPU models through any serial port, including the
• Use the RS485 and RS232 ports for HMI access (Data read/write) and Freeport
● PROFIBUS port: Each EM DP01 PROFIBUS DP module can support six connections.
● CM01 Signal Board (SB) RS232/RS485 port (Port 1): Four connections to support HMI
devices.
Note
The CPU models CPU CR20s, CPU CR30s, CPU CR40s, and CPU CR60s do not
support the use of expansion modules or signal boards.
396
eight passive (server) connections to support S7-200 SMART CPUs or other Ethernet
devices.
passive (server) connections to support S7-200 SMART CPUs or network devices.
RS485 port, the signal board port, and the DP01 PROFIBUS port.
communications.
System Manual, V2.3, 07/2017, A5E03822230-AF
S7-200 SMART