Specifications

Setting Up Communications Hardware and Network Communications
7-2
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
7.1 What Are My Communication Choices?
You can arrange the S7-200 CPUs in a variety of configurations to support network
communications. You can install the STEP 7-Micro/WIN 32 software on a personal
computer (PC) that has a Windows 95, Windows 98, or Windows NT operating
system, or you can install it on a SIMATIC programming device (such as a
PG 740). You can use the PC or the programming device as a master device in
any of the following communications configurations:
 Single Master: A single master device is connected to one or more slave
devices. See Figure 7-1.
 Multiple Master: A single master device is connected to one or more slave
devices and one or more master devices. See Figure 7-2.
 For 11-bit modem users: A single master device is connected to one or more
slave devices. This master device is connected by means of 11-bit modems
either to one S7-200 CPU functioning as a slave device or to a network of
S7-200 CPUs functioning as slave devices.
 For 10-bit modem users: A single master device is connected to only one
S7-200 CPU functioning as a slave device by means of a10-bit modem.
Figure 7-1 and Figure 7-2 show a configuration with a personal computer
connected to several S7-200 CPUs. STEP 7-Micro/WIN 32 is designed to
communicate with one S7-200 CPU at a time; however, you can access any CPU
on the network. The CPUs could be either slave or master devices. The TD 200 is
a master device. For detailed information on network communications, see
Section 7.5.
RS-232
RS-485
PC/PPI
Cable
Station 0
S7-200 CPU
Station 2
S7-200 CPU
Station 3
S7-200 CPU
Station 4
Network Connector
Figure 7-1 Using a PC/PPI Cable for Communicating with Several S7-200 CPUs