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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
5-36 A5E00105492-03
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The PROFIBUS-DP interface is mainly used to connect distributed I/O.
PROFIBUS DP allows you to create large, extended subnets, for example.
The PROFIBUS DP interface can be configured as either master or slave, and
offers a transmission speed of up to 12 Mbps.
The CPU sends its bus parameters (e.g. the baud rate) to the PROFIBUS DP
interface (if it is used as the master). A programming device, for example, can then
automatically retrieve the correct parameters and connect to a PROFIBUS subnet.
In your configuration, you can disable this bus parameter broadcast.
CPU 317-2 DP has two DP interfaces: The first interface is an MPI/DP interface
that you can reconfigure as a PROFIBUS interface in STEP 7.
Table 5-16 Possible interface operating modes for CPU 317-2 DP
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• MPI
• DP master
• DP slave
1)
• Not assigned
• DP master
• DP slave
1
1)
Excluded: DP slave at both interfaces simultaneously
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If you have disabled the Commissionin
/ Test mode check box in the DP interface
properties in STEP 7, the baud rate you have set will be ignored, and the master's
baud rate will be used automatically, The routing function is then no longer
possible over this interface.
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For information on the new DPV1 functionality, see the section with the same
name in the &38'DWD5HIHUHQFH0DQXDO&38[&DQG&38[.
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You can use the PtP (Point to Point) interface on your CPU to connect external
devices such as a barcode reader, printer, etc. to a serial port. Baud rates of up to
19.2 Kbps for full duplex (RS 422) and up to 38.4 Kbps for half duplex (RS 485) are
possible.
The following PtP communication drivers are installed in the CPUs:
• ASCII driver
• 3964(R) Protocol
• RK 512 (only CPU 314C-2 PtP)
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