114 Rockwell Automation Publication 1789-UM002K-EN-P - January 2015
Chapter 6 Execute External Routines
Fault Conditions
This table describes major fault conditions.
Execution
The JXR can be synchronous or asynchronous depending on the implementation
of the DLL. The code in the DLL also determines how to respond to scan status,
rung-condition-in status, and rung-condition-out status.
Type Checking
This table describes the type checking that occurs between the Logix Designer
application and the external routine for the parameters that they pass.
For more details on creating a DLL by using Visual Studio, see Create a Visual
Studio Project on page 117.
A major fault occurs if Fault type Fault code
• An exception occurs in the external routine DLL.
• The DLL could not be loaded.
• The entry point was not found in the DLL.
488
Data Type C++ Type Passing Method Type Checking Arrays
BOOL Bool By reference
By value
Strong type checking By reference
Array sizes are not checked, but the size
information is passed through the control
structure
INT Short
DINT Long
Int
SINT Char
REAL Float
User-defined structure Structure By reference Weak type checking
The check determines whether a structure is
being passed to a structure parameter. Data types
and sizes are not checked.
By reference
Array sizes are not checked, but the size
information is passed through the control
structure
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