Siemens SIMATIC S7-200 System Manual page 232

S7-200 Programmable Controller System Manual
Networks with Baud Rates Above 187.5 kbaud
For baud rates above 187.5 kbaud, the S7-200 CPU must use an EM 277 module for connecting
to the network. See Figure 7-16. STEP 7--Micro/WIN must be connected by a communications
processor (CP) card.
In this configuration, the S7-300 can communicate
with the S7-200s, using the XPUT and XGET
instructions, and the HMI can monitor either the
S7-200s or the S7-300.
The EM 277 is always a slave device.
STEP 7--Micro/WIN can program or monitor either
S7-200 CPU through the attached EM 277. To
communicate with an EM 277 above 187.5 kbaud,
configure STEP 7--Micro/WIN to use MPI protocol
with a CP card. The maximum baud rate for the PPI
Multi-Master cables is 187.5 kbaud.
Sample PROFIBUS-DP Network Configurations
Networks with S7-315- -2 DP as PROFIBUS Master and EM 277 as PROFIBUS
Slave
Figure 7-17 shows a sample PROFIBUS network
that uses an S7-315--2 DP as the PROFIBUS
master. An EM 277 module is a PROFIBUS slave.
The S7-315--2 DP can read data from or write data
to the EM 277, from 1 byte up to 128 bytes. The
S7-315--2 DP reads or writes V memory locations in
the S7-200.
This network supports baud rates from 9600 baud
to 12 Mbaud. to 12 Mbaud.
Networks with STEP 7- -Micro/WIN and HMI
Figure 7-18 shows a sample network with an
S7-315--2 DP as the PROFIBUS master and
EM 277 as a PROFIBUS slave. In this configuration,
the HMI monitors the S7-200 through the EM 277.
STEP 7--Micro/WIN programs the S7-200 through
the EM 277.
This network supports baud rates from 9600 baud
to 12 Mbaud. STEP 7--Micro/WIN requires a CP
card for baud rates above 187.5 kbaud.
218
S7-300
STEP 7- -Micro/WIN
S7-200 EM 277
Figure 7-16 Baud Rates Above 187.5 Kbaud
S7-315-2 DP
PROFIBUS-DP
ET 200 ET 200
Figure 7-17 Network with S7-315- -2 DP
S7-315- -2 DP
PROFIBUS-DP
ET 200
STEP 7- -Micro/WIN
Figure 7-18 PROFIBUS Network
HMI
S7-200 EM 277
S7-200 EM 277
HMI
S7-200 EM 277