ProSoft Technology MVI56-PDPMV1 - Manual (Page 146)

Mailbox Messaging MVI56-PDPMV1 ♦ ControlLogix Platform
User Manual PROFIBUS DPV1 Master
Page 146 of 255 ProSoft Technology, Inc.
March 22, 2011
3.3.2 Output Mailbox: Legacy Mode
The following block requests a mailbox message from the module.
Block Format for Mailbox Out Message Request (Output Image)
Word Offset
Start Word Offset
End Description
0 0 Block number 100 to 109
1 144 Mailbox output message for module
145 247 Reserved for future use
Block Format for Mailbox Out Message Response (Input Image)
After the module receives the mailbox request, it immediately sends a data block
as confirmation that the block was received.
Word Offset
Start Word Offset
End Description
0 0 Block number 100 to 109
1 1 Status of out mailbox request:
0 = request successfully added to mailbox queue.
1 = queue allocation error
2 = queue is full
2 247 Reserved for future use
248 248 Index of output image to receive (1 to 4 for data, 0 or -1 if no data)
249 249 Block number 100 to 109
3.3.3 Receiving Mailbox Message Responses from the Module:
Legacy Mode
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
MVI56 module to the processor. The response is returned from the MVI56-
PDPMV1 via the PROFIBUS Input data block.
Remembering the PROFIBUS Input Data Memory Map:
Word 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