ProSoft MVI56-PDPMV1 - Mailbox Message Queuing; Queue Timeouts; Flex Mode Mailbox Communication

Mailbox Messaging MVI56-PDPMV1 ♦ ControlLogix Platform
User Manual PROFIBUS DPV1 Master
Page 130 of 251 ProSoft Technology, Inc.
3.1 Mailbox Message Queuing
The MVI56-PDPMV1 module operates asynchronously on the Mailbox Messages
and as such provides for the queuing of the messages as they are received. The
queue sizes used in the module are as follows:
Queue Type
Queue Size
Max
Description
Output message from processor
126
Number of messages that the MVI56 module
will queue by type of message. Note that status
of the queues can be monitored via the Queue
Message Count values.
Input messages for processor
126
Alarm messages from slaves for
processor
100
3.1.1 Queue Timeouts
The MVI56-PDPMV1 module will only allow a message to stay in a queue for up
to 10 seconds. If the PROFIBUS Master (for output messages) or the processor
(for input and alarm messages) has not successfully received a message within
10 seconds, the module will clear the message out of the queue.
3.2 Flex Mode Mailbox Communication
The processor sends a MSG instruction to the module with a Set Attribute Single
type to request the module to process a mailbox function.