464 Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Chapter 11 Program Control Instructions (JMP, LBL, JSR, RET, SBR, JXR, TND, MCR, UID, UIE, AFI, NOP, EOT, SFP, SFR, EVENT)
Description: Use the Jump to External Routine (JXR) instruction to call the external routine
from a ladder routine in your project. The JXR instruction supports multiple
parameters so you can pass values between the ladder routine and the external
routine.
The JXR instruction is similar to the Jump to Subroutine (JSR) instruction. The
JXR instruction initiates the execution of the specified external routine:
· The external routine executes one time.
· After the external routine executes, logic execution returns to the routine that
contains the JXR instruction.
Arithmetic Status Flags: Arithmetic status flags are not affected.
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.
For more information on using the JXR instruction and creating
external routines, see the SoftLogix5800 System User Manual,
publication 1789-UM002
.
A major fault will occur 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.
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