Allen-Bradley POINT I/O PROFIBUS 1734-APB, Руководство пользователя, Страница: 52 / 88

Publication 1734-UM005B-EN-P - June 2001
4-14 Communication and I/O Table Mapping
A maximum of 10 channel related diagnostic messages are possible. If
you exceed the limit, the diagnostic overflow bit in station status 3 will
be set.
Note: If the diagnostic buffer is full and the adapter receives an
additional error message, this new message will be queued in the
adapter internally and passed on to the master as soon as space is
available in the diagnostic buffer (i.e. when older messages are
deleted).
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Byte 15 1 0 Slot number of the module that reports diagnostics (1-63)
Byte 16
Channel Direction
01 - Input
10 - Output
11 - Input/Output Type of channel that reports diagnostics
Byte 17 Channel Type:
001 = Bit
010 - 2 bits
011 - 4 bits
100 - Byte
101 - Word
110 - Double word Error codes (see Appendix B)
Byte 18-20 2nd channel specific message (same assignments as bytes 15-17)
Byte 42-44 10th channel specific message (same assignments as bytes 15-17)