ProSoft Technology MVI46-PDPMV1 - Manual (Page 89)

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