ProSoft Technology MVI56E-MNETC - Manual (Page 124)

Guide to the MVI56E-MNETC User Manual MVI56E-MNETC ♦ ControlLogix Platform
User Manual Modbus TCP/IP Client Enhanced Communication Module
Page 124 of 183 ProSoft Technology, Inc.
February 3, 2013
Word Offset Server Status
16 Total number of MBAP command list requests
17 Total number of MBAP command list responses
18 Total number of MBAP command list errors sent
19 Total number of MBAP command list errors received
Status information transferred in the Server Status block can be viewed in the
MNETC.STATUS controller tag in the ladder logic. For more information, see
Status Data Definition (page 102).
Controller Tags
To issue a Server Status block request, enter the appropriate values in the
following members of the MNETC.STATUS controller tag in the ladder logic.
Controller Tag Data Type Description
ServerStatsTrigger BOOL Set the value of this tag to 1 to trigger the Server
Status block request.
Status information transferred in the Server Status block can be viewed in the
MNETC.STATUS controller tag in the ladder logic. For more information, see
Status Data Definition (page 102).
Event Command Blocks with Sequence Number (4000 to 4029, 4100 to 4129,
and 4200)
Event Command block with Sequence Number (4000 to 4029)
Note: To use the Event Sequence Command Block for polling operations, you
need to configure at least one command in the client even if the command is
disabled.
During routine operation, the module continuously cycles through the user-
defined MNET Client x Command List (page 51) for each Client, examining
commands in the order they are listed, and sending enabled commands on the
network. However, the module also has a special command priority queue, which
is an internal buffer that holds commands from special function blocks until they
can be sent on the network.
When one or more commands appear in the command priority queue:
1 The routine polling process is temporarily interrupted.
2 The commands in the command priority queue are executed until the queue
is empty.