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134 Rockwell Automation Publication 1756-UM533C-EN-P - February 2011
Chapter 8 Getting HART Data By Using CIP MSG
HART Pass-through CIP
Message Layout Details
See the following tables for pass-through information.
Pass-through Init (Service Code= 16#4E)
These tables show the request and reply packet structures for the Pass-through
Init service.
Pass-through Query (Service Code= 16#4F)
These tables show the request and reply packet structures for the Pass-through
Query service.
Table 40 - Request Packet
Offset Field Data Type Definition
0 HART Command USINT HART Command Number
(1) (2)
1 HART Data Size USINT Number of Data Bytes for Selected HART Command
(1)(2)
2…256 HART Data bytes As many bytes as in HART Data Size HART Command Data
(1)
Request Size = 2…257 bytes
(1) See Appendix C on page 193 for more information.
(2) If this field is displayed as SINT in RSLogix 5000 software, values > 127 appear negative.
Table 41 - Reply Packet
Offset Field Data Type Definition
0 Status USINT Command Status
32 = Busy - try again later
33 = Initiated - command started - send Query to get the reply
35 = Dead - Device not online
1 HART Command USINT Echo of HART Command
(1)
2 Handle USINT Handle Used in Query Operation
(1)
3 Queue Space
Remaining
USINT Number of Queues Still Available for This Channel
(1)
If status (bit 0) is 35, refer to Table 44 for the error code description.
Reply Size = 4 bytes
(1) If this field is displayed as SINT in RSLogix 5000 software, values > 127 appear negative.
Table 42 - Request Packet
Offset Field Data Type Definition
0 Handle USINT Handle for Query (from Handle Field above)
(1)
Request Size = 1 byte
(1) If this field is displayed as SINT in RSLogix 5000 software, values > 127 appear negative.