ProSoft Technology MVI69-PDPMV1 - Manual (Page 116)

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