Establishing Communication With The S7-200 Cpu - Siemens Simatic S7-200 System Manual
Programmable controller
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3.3
Establishing Communication with the S7-200 CPU
You can arrange the S7-200 CPUs in a variety of configurations to support network
communications. You can install the STEP 7-Micro/WIN software on a personal computer
(PC) that has a Windows 3.1x, Windows 95, 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:
A single master device is connected to one or more slave devices. See Figure 3-3.
A single master device is connected to one or more slave devices and one or more
master devices. See Figure 3-4 and Figure 3-5.
A CPU 215 functions as a remote I/O module owned by an S7-300 or S7-400
programmable logic controller or by another PROFIBUS master. See Figure 3-13.
A single master device is connected to one or more slave devices. This master device is
connected by means of 11-bit modems to either one S7-200 CPU functioning as a slave
device or else to a network of S7-200 CPUs functioning as slave devices. See
Figure 3-14.
Connecting Your Computer to the S7-200 CPU Using the PC/PPI Cable
Figure 3-3 shows a typical configuration for connecting your personal computer to your CPU
with the PC/PPI cable. To establish proper communications between the components, follow
these steps:
1.
Set the DIP switches on the PC/PPI cable for the baud rate.
2.
Connect the RS-232 end of the PC/PPI cable labeled PC to the communications port of
your computer, either COM1 or COM2, and tighten the connecting screws.
3.
Connect the other end (RS-485) of the PC/PPI cable to the communications port of the
CPU, and tighten the connecting screws.
For the technical specifications of the PC/PPI cable, see Section A.40; for its order number,
see Appendix G.
DIP switch settings (down = 0, up = 1):
0 1 0 0 = 9600 baud (shown)
0 0 1 0 = 19200 baud
1
0
Figure 3-3
S7-200 Programmable Controller System Manual
C79000-G7076-C230-02
Installing and Using the STEP 7-Micro/WIN Software
RS-232
PC/PPI cable
Communicating with a CPU in PPI Mode
Computer
S7-200 CPU
RS-485
3-7
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