MVI46-PDPMV1 ♦ SLC Platform
Mailbox Messaging
PROFIBUS DPV1 Master
User Manual
ProSoft Technology, Inc.
Page 89 of 160
March 25, 2011
4.3
Receiving Mailbox Message Responses from the Module
After a mailbox message has been sent, a response from the command, usually
containing the requested data or the status of the command, is returned from the
MVI46 module to the processor. The response is returned from the MVI46-
PDPMV1 via the M1 file.
Remembering the PROFIBUS Input Data Memory Map:
Byte Offset
Name
Description
0 to 72
Configuration, Status and Control data
73
Number of Messages in the In Mailbox Queue
74
Number of Messages in the Out Mailbox Queue
75
Number of Messages in the Alarm Queue
76
Last Out Mailbox Message ID processed from Output
Image
77
Current In Mailbox Control Index
78
Current Alarm Control Index
79 to 222
Incoming Mailbox Message data
223 to n
PROFIBUS Input Data
The important section relevant to the Mailbox Messaging discussion is the
Incoming Mailbox Data section (Byte Offsets 79 to 222). Within this section of
data, the following structure exists:
Mailbox Message Structure: From MVI46 module
Byte Offset
Type
Description
79
Message ID
Message ID value will match value used to generate the
outgoing mailbox message
80
Message Info
See individual commands for data values to be entered in
each of these register locations
81
Command
82
Data Size
83
Frame Count
84
Frame Number
85
Offset High
86
Offset Low
87
Extended Word 1
88
Extended Word 2
89
Extended Word 3
90
Extended Word 4
91
Extended Word 5
92
Extended Word 6
93
Extended Word 7
94
Extended Word 8
-
See individual
commands
222
