ProSoft Technology MVI56-104S - Manual (Page 56)

MVI56-104S ♦ ControlLogix Platform Ladder Logic
IEC 60870-5-104 Server Communication Module User Manual
Page 56 of 188
ProSoft Technology, Inc.
November 18, 2009
3.1 User-defined Data Types
3.1.1 Module Data Object (ModuleDef870)
To hold and organize all data related to the MVI56-104S module, data is stored
in Controller Tags and Tag Arrays based on standard data types as well as
special User-defined Data Types (UDTs).
The ModuleDef870 data object is the top-level UDT that organizes all data
related to the module into one overall data structure.
Tag Name Data Type Description
IEC870S.InStat InStat870 Status information updated and passed in each
input image read block
ReadData INT[600] Data read from module
IEC870S.WriteData INT[600] Data to write to module
IEC870S.Control Control870 Special function blocks
IEC870S.BP Backplane870 Data to sequence and control backplane data block
transfer logic
IEC870S.Util Util870 Variables used for convenience purposes
The next few sections will provide a more detailed breakdown of the mid-level
and lower-level UDTs used to build the Module Data Object.
User Data Objects
These objects are simple controller tag arrays, composed of 600, 16-bit signed
integer (INT) data words (each array element is one 16-bit word). These arrays
hold data to be transferred between the processor and the MVI56-104S module.
Data is transferred between the processor and the module as "pages" of up to
200 words (array elements) of user data per transfer.
Name Data Type Description
ReadData INT[600] Data read from module
WriteData INT[600] Data to write to module
The ReadData array size should be set to match the value entered in the Read
Register Count parameter of the IEC8704S.CFG file. For ease of use, this array
should be dimensioned as an even increment of 200 words. This data is paged,
200 words at a time, from the module to the processor. The ReadData task
places the data received into the proper position in the ReadData array. Use this
incoming data for status and control in the ladder logic of the processor.
The WriteData array size should be set to match the value entered in the Write
Register Count parameter of the IEC8704S.CFG file. For ease of use, this array
should be dimensioned as even increments of 200 words. This data is paged,
200 words at a time, from the processor to the module. The WriteData task
places the values in the WriteData array into the output image for transfer to the
module. This data is passed from the processor to the module for use as status
and control information by other nodes on the network.