ProSoft Technology MVI46-PDPMV1 - Manual (Page 120)

Reference MVI46-PDPMV1 ♦ SLC Platform
User Manual PROFIBUS DPV1 Master
Page 120 of 160 ProSoft Technology, Inc.
March 25, 2011
Mailbox Communication
Mailbox requests are built and sent through ladder logic according to the data
listed in the BLD_MB routine.
The module immediately responds with a confirmation message consisting of the
Mailbox Out Message Response to the processor.
After the mailbox request is processed by the module, it sends the Mailbox In
Message to the processor. Note that the ladder should refer to the command
data to copy the mailbox response to the correct data file. For example:
command = 02 => Set Operating Mode Response 1
Input Data
This section contains the PROFIBUS Cyclic Input data received from the slave or
slaves.
M0 Output Image
Output Data Area Map (M0 File)
M0 Word Offset Description
0 Last in mailbox control index
1 Last alarm control index
2 to 3 PROFIBUS CRC32
4 to 5 Module CRC32
6 to 149 Out Mailbox Acyclic Data
150 to n PROFIBUS Cyclic Output Data
6.2.3 PROFIBUS DP Architecture
The PROFIBUS DPV1 network supports multiple Master systems with several
slaves.
The following table shows the most important features of PROFIBUS DPV1:
Standard EIN 501 70
DIN 19245
Transmission equipment (Physical) EIA RS-485
IEC 1158-2 (through link or coupler)
Fiber Optic Cable (not available)
Transfer procedure Half-duplex
Bus topology Linear bus with active bus termination
Bus cable type Shielded twisted pair conductors
Connector 9-pin D-Sub
Number of nodes on the bus Max: 32 with no repeaters
Max: 125 with 3 repeaters in 4 segments