Siemens SIMATIC S7-200 System Manual page 231

Complex PPI Networks
Figure 7-13 shows a sample network that uses
multiple masters with peer-to-peer communications.
STEP 7--Micro/WIN and the HMI device read and
write over the network to the S7-200 CPUs, and the
S7-200 CPUs use the Network Read and Network
Write instructions to read and write to each other
(peer-to-peer communications).
Figure 7-14 shows another, example of a complex
PPI network that uses multiple masters with
peer-to-peer communications. In this example, each
HMI monitors one S7-200 CPU.
The S7-200 CPUs use the NETR and NETW
instructions to read and write to each other
(peer-to-peer communications).
For complex PPI networks configure STEP
7--Micro/WIN to use PPI protocol and check the
Multiple Master Network and the PPI Advanced
check boxes if available. If you are using a PPI check boxes if available If you are using a PPI
Multi-Master cable, the Multiple Master Network and
PPI Advanced check boxes are ignored.
Sample Network Configurations Using S7-200, S7-300, and S7-400
Devices
Networks with Baud Rates Up to 187.5 kbaud
In the sample network shown in Figure 7-15, the
S7-300 uses the XPUT and XGET instructions to
communicate with an S7-200 CPU. The S7-300
cannot communicate with an S7-200 CPU in master
mode.
To communicate with the S7 CPUs, configure
STEP 7--Micro/WIN to use PPI protocol and check
the Multiple Master Network and the PPI Advanced
check boxes if available. If you are using a PPI
Multi-Master cable, the Multiple Master Network and
PPI Advanced check boxes are ignored.
Communicating over a Network
STEP 7- -Micro/WIN
HMI
Figure 7-13 Peer-to-Peer Communications
HMI
STEP 7- -Micro/WIN
S7-200
Figure 7-14 HMI Devices and Peer-to-Peer
S7-300
STEP 7- -Micro/WIN
S7-200
Figure 7-15 Baud Rates Up to 187.5 Kbaud
Chapter 7
S7-200
S7-200
HMI
S7-200
HMI
S7-200
217