ProSoft Technology 5205-DFNT-PDPS - Manual (Page 20)

PDPS ♦ ProLinx Gateway Functional Overview
PROFIBUS DP Slave
Page 20 of 61 ProSoft Technology, Inc.
December 31, 2008
2.5.1 Mailbox From PLC to Gateway
Start Byte End Byte Description
0 0 Block number of data in block
1 1 Block number of data requested
2 198 Data for block
199 199 Block number of data in block
2.5.2 Mailbox From Gateway to PLC
Start Byte End Byte Description
0 0 Block number of data in block
1 1 Block number last requested by PLC
2 198 Data for block
199 199 Block number of data in block
2.5.3 Example Raw Database Exchange
Start Byte End Byte Description
0 0 150 (Raw data write)
1 1 160 (Raw data read)
2 3 Start register in database for write
4 5 Number of registers to write (1 to 94)
6 7 Start register in database for read
8 9 Number of registers to read (1 to 96)
10 197 Words to write to the database
198 198 Reserved
199 199 150 (Raw data write)
2.5.4 Example Response Block From GW
Start Byte End Byte Description
0 0 160 (Raw data read)
1 1 150 (Raw data write)
2 3 Start register in database for read
4 5 Number of registers to read (1 to 96)
6 197 Words read from the database
198 198 Reserved
199 199 160 (Raw data read)