Siemens SIMATIC S7-200 System Manual page 230

S7-200 Programmable Controller System Manual
Sample Network Configurations Using Only S7-200 Devices
Single-Master PPI Networks
For a simple single-master network, the
programming station and the S7-200 CPU are
connected by either a PPI Multi-Master cable or by
a communications processor (CP) card installed in
the programming station.
In the sample network at the top of Figure 7-10, the
programming station (STEP 7--Micro/WIN) is the
network master. In the sample network at the
bottom of Figure 7-10, a human-machine interface
(HMI) device (such as a TD 200, TP, or OP) is the
network master.
In both sample networks, the S7-200 CPU is a slave
that responds to requests from the master.
For a single-master PPI network, configure STEP 7--Micro/WIN to use PPI protocol. Uncheck the
Multiple Master Network and the PPI Advanced check boxes, if available.
Multi-Master PPI Networks
Figure 7-11 shows a sample network of multiple
masters with one slave. The programming station
(STEP 7--Micro/WIN) uses either a CP card or a PPI
Multi-Master cable. STEP 7--Micro/WIN and the HMI
device share the network.
Both STEP 7--Micro/WIN and the HMI device are
masters and must have separate network
addresses. When the PPI Multi-Master cable is
being used, the cable is a master and uses the being used, the cable is a master and uses the
network address supplied by STEP 7--Micro/WIN.
The S7-200 CPU is a slave.
Figure 7-12 shows a PPI network with multiple
masters communicating with multiple slaves. In this
example, both STEP 7--Micro/WIN and the HMI can
request data from any S7-200 CPU slave.
STEP 7--Micro/WIN and the HMI device share the
network.
All devices (masters and slaves) have different
network addresses. When the PPI Multi-Master
cable is being used, the cable is a master and uses
the network address supplied by the network address supplied by
STEP 7--Micro/WIN. The S7-200 CPUs are slaves.
For a network with multiple masters and one or more slaves, configure STEP 7--Micro/WIN to use
PPI protocol and check the Multiple Master Network and the PPI Advanced check boxes if they
are available. If you are using a PPI Multi-Master cable, the Multiple Master Network and PPI
Advanced check boxes are ignored.
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STEP 7- -Micro/WIN
HMI (such as a TD 200)
Figure 7-10 Single-Master PPI Network
STEP 7- -Micro/WIN
Figure 7-11 Multiple Masters with One Slave
STEP 7- -Micro/WIN
HMI
Figure 7-12 Multiple Masters and Slaves
S7-200
S7-200
S7-200
HMI
S7-200
S7-200