Siemens Simatic S7-200 System Manual page 38

Installing and Using the STEP 7-Micro/WIN Software
Figure 3-4 shows a configuration with a personal computer connected to several S7-200
CPU modules. STEP 7-Micro/WIN is designed to communicate with one S7-200 CPU at a
time; however, you can access any CPU on the network. The CPU modules in Figure 3-4
could be either slave or master devices. The TD 200 is a master device. For detailed
information on network communications, see Chapter 9.
Note
Only STEP 7-Micro/WIN 16 with a Windows 3.1 operating system and
STEP 7-Micro/WIN 32 support multiple masters through the PC/PPI cable;
STEP 7-Micro/DOS does not.
Station 0
Figure 3-4
Connecting Your Computer to the S7-200 CPU Using the MPI or CP Card
You can use STEP 7-Micro/WIN with a multipoint interface (MPI) or communications
processor (CP) card. Either card provides a single RS-485 port for connection to the network
using an MPI cable. STEP 7-Micro/WIN 32 (the 32-bit version) supports the MPI parameter
set for an MPI network; STEP 7-Micro/WIN 16 (the 16-bit version) does not. After
establishing MPI communications, you can connect STEP 7-Micro/WIN on a network that
contains other master devices. Each master must have a unique address. Figure 3-5 shows
a sample network with master and slave devices. For detailed information on network
communications, see Chapter 9. For information on the MPI card and the various CP cards
that are available, see Section 9.4. Appendix G lists their order numbers.
Note
If you are using the PPI parameter set, STEP 7-Micro/WIN does not support two different
applications running on the same MPI or CP card at the same time. Close the other
application before connecting STEP 7-Micro/WIN to the network through the MPI or CP
card.
3-8
S7-200 CPU
Station 2
RS-232
RS-485
PC/PPI Cable
Using a PC/PPI Cable for Communicating with Several S7-200 CPU Modules
S7-200 CPU S7-200 CPU
Station 3 Station 4
TD 200
S7-200 Programmable Controller System Manual
C79000-G7076-C230-02