
Mailbox Messaging MVI69-PDPMV1 ♦ CompactLogix or MicroLogix Platform
User Manual PROFIBUS DPV1 Master
Page 116 of 225 ProSoft Technology, Inc.
July 8, 2011
4.4.12 Mailbox Message: Class 2 Acyclic Data Read
This command issues a Class 2 DPV1 acyclic read request to a slave. Prior to
issuing this command, a connection to the slave must have been established,
see Initiate Class 2 Connection (page 110).
Parameter Description
Command Initiator Application
Command Name FB_APPL_MSAC2_READ
Command Number 0027h
Fragmented No
Command and Response Layout: Class 2 Acyclic Read
Command Response
Message ID
(ID)
(ID)
Message information 4002h
0002h
Command 0027h
0027h Class 2 Acyclic Read
Data size 0000h
(data size) Number of data bytes (n)
Frame count 0001h
0001h
Frame number 0001h
0001h
Offset high 0000h
0000h
Offset low 0000h
0000h
Extended word 1 C_REF C_REF
Extended word 2 Slot Index Slot Index
Extended word 3 Length -
Length -
Extended word 4 -
-
Extended word 5 -
Error
Decode
Extended word 6 -
Error Code 1
Error Code 2
Extended word 7 -
Extended Fault information
Extended word 8 -
Fault Information
Read Data 1 Response Data byte 1
Read Data 2 Response Data byte 2
Read Data 3 Response Data byte 3
... ...
Read Data n Response Data byte n
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