ProSoft Technology MVI56-103M - Manual (Page 62)

Ladder Logic MVI56-103M ♦ ControlLogix Platform
User Manual IEC 60870-5-103 Master Communication Module
Page 62 of 152 ProSoft Technology, Inc.
February 22, 2013
3.3 Event Message Data Object
The module can be configured to pass event messages received from the
controlled devices to the processor. The module sends this information to the
processor in read blocks with identification codes of 9903. The example ladder
logic has a data structure that conforms to the data structure sent for each
element by the module. The following table describes the structure of this object.
Name Data Type Description
SessSect INT
ASDU INT
FuncPnt INT
FaultNum INT
mSec INT
HrMin INT
VDst INT
RelTime INT
val DINT
The example ladder logic defines a 20-element array of the I103Mevent objects
to hold the data received in a single 9903 block. Ladder logic to handle a 9903
block is shown in the following figure:
This simple logic does not use the message count parameter in the block and will
not work for most applications. It is only provided as an example to display how
to move the 9903 data to a user controller tag. If the message pass-through
feature is utilized, more logic is required to store the messages received. This
feature is most commonly utilized to pass events from the controlled device to an
event logger connected to the processor.