Receiving Mailbox Message Responses From The Module - ProSoft Technology inRax MVI69-PDPMV1 User Manual

Mailbox Messaging
User Manual
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
MVI69 module to the processor. The response is returned from the MVI69-
PDPMV1 via the PROFIBUS Input data block.
Remembering the PROFIBUS Input Data Memory Map:
Byte Offset
0 to 72
73
74
75
76
77
78
79 to 222
223 to n
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 MVI69 module
Byte Offset
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
-
222
Page 84 of 225
Name Description
Configuration, Status and Control data
Number of Messages in the In Mailbox Queue
Number of Messages in the Out Mailbox Queue
Number of Messages in the Alarm Queue
Last Out Mailbox Message ID processed from Output
Image
Current In Mailbox Control Index
Current Alarm Control Index
Incoming Mailbox Message data
PROFIBUS Input Data
Type Description
Message ID Message ID value will match value used to generate the
outgoing mailbox message
Message Info See individual commands for data values to be entered in
each of these register locations
Command
Data Size
Frame Count
Frame Number
Offset high
Offset Low
Extended Word 1
Extended Word 2
Extended Word 3
Extended Word 4
Extended Word 5
Extended Word 6
Extended Word 7
Extended Word 8
See individual
commands
MVI69-PDPMV1 ♦ CompactLogix or MicroLogix Platform
PROFIBUS DPV1 Master
ProSoft Technology, Inc.
July 8, 2011