Rockwell Automation 1756-OF8H ControlLogix HART Analog I/O Modules - Manual (Page 136)

136 Rockwell Automation Publication 1756-UM533C-EN-P - February 2011
Chapter 8 Getting HART Data By Using CIP MSG
Flush Queue (Service Code= 16#50)
These tables show the request and reply packet structures for the Flush Queue
service.
Note that Flush Queue can be sent to have the 1756-IF8H or 1756-OF8H
module discard any pending HART replies awaiting a query command. These
replies are automatically discarded after a period of time, which is configurable on
the Configuration tab of the Module Properties dialog box. This value is usually
15 seconds. Unless you need to discard the replies faster than 15 seconds, you
won't need to use this Flush Queue command.
HART Pass-through
Message Ladder Logic
Example This is an example of sending HART command 9, which reads Device Variables
from the HART field device. You send a list of the Device Variable codes you
want, and the field device responds with its values, units, classification, and status.
The information in HART command 9 can be obtained more easily by using
service 4B, but this example gives you an idea of how to send any pass-through
message command you want.
Table 45 - Request Packet
Offset Field Data Type Definition
No request data
Request size = 0 bytes
Table 46 - Reply Packet
Offset Field Data Type Definition