Allen-Bradley 1444-AOFX00-04RB, Руководство пользователя, Страница: 403 / 550

Rockwell Automation Publication 1444-UM001D-EN-P - June 2018 403
CIP Objects Appendix A
Channel Select
The Dynamix 1444, as part of an 0x4F service response, return the following.
Bit 0 1 2 3 4 5 6 7
Channel 0 1 2 3 Reserved
Table 130 - 0x4F Service Responses
Byte Offset
Within
Structure Structure Member Data
Type Description
0 SessionInstance USINT The host copies the SessionInstance returned here into each
subsequent CM Record Request.
Up to 3 instances are supported.
1 DynamicChannel USINT Indicates the dynamic channel for this record. Channels 0…3
are valid channels.
2 Completed Records UINT Incremented each time that another complete record has been
transferred.
There are often several packets per completed record.
4 RecordSize UDINT For a given session, the RecordSize returned here is fixed.
8 PacketCountDown DWORD The host copies the PacketCountDown returned here into each
subsequent Record Request. When the PacketCountDown
reaches 0, the session is complete and the final value in
CompletedRecords is all that is transferred.
12 Status DINT Any of the following can be returned:
• eUnrecognizedSession (1)
• e maxSessionsReached (2)
• ePacketCountOutOfSequence (3)
• eInvalidBufferSelect(4)
• eNoDataAvailable (5)
• eGeneralError (6)
• eLiveMeasurementInProgress (13)
For all successful requests, eSUCCESS (0) is returned. Any other
value ends the session.
16 Data Array DWORD
[50] Each record is an array of DWORDs of size RecordSize. This array
of records can be large. It is the calling applications
responsibility to handle these records appropriately. The
DWORD type is just a placeholder for the actual types in the
data structure that maps to this RecordArray. See the next
section for details.