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3 ladder logic – ProSoft Technology MVI56-104S User Manual

Page 55

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Ladder Logic

MVI56-104S ♦ ControlLogix Platform

User Manual

IEC 60870-5-104 Server Communication Module


ProSoft Technology, Inc.

Page 55 of 188

November 18, 2009

3 Ladder

Logic

In This Chapter

User-defined Data Types ................................................................... 56

Normal Data Transfer ........................................................................ 65

Special Function Blocks ..................................................................... 67

Ladder logic is required for application of the MVI56-104S module. Tasks that
must be handled by the ladder logic are module data transfer, special block
handling, and status data receipt. Additionally, a power-up handler may be
needed to handle the initialization of the module’s data and to clear any
processor fault conditions.

The sample ladder logic, on the ProSoft Solutions CD-ROM, is extensively
commented, to provide information on the purpose and function of each rung. For
most applications, the sample ladder will work without modification.

All data related to the MVI56-104S is stored in a user-defined data type. At least
one instance of each data type is required before the module can be used. This
is done by declaring a controller tag variable or variable array of the data type in
the Controller Tags Edit Tags dialog box (this will be done automatically if you
use the Add-On Instruction Rung Import file or use a copy of the provided ladder
logic sample).


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