Instruction Status
You can check the error status with the system variable #L_ExIOSpParmErr (special I/O parameter error).
31.5.1.3 Special I/O System Variables
Enabling condition
While the instruction is in operation and when the parameter has been changed.
If no error has occurred (refer to the following notes).
Disabling condition
While the instruction is in operation and when the parameter has been changed, the parameter change completion flag turns off.
*When disabled, the operand D1 is cleared to 0.
Notes
While executing the instruction, any parameter changes are monitored. If it is being changed, an error occurs and no process will be performed.
When there is something wrong with the parameter change, an error occurs.
When the operand D1 cannot be recognized in the instruction, an error occurs.
When executing the instruction using the pulse (for example, PT instruction), you need to turn the instruction OFF and then turn it ON to execute it again.
When the instruction is executed, it will be in operation.
If the instruction is in operation, the instruction will be executed continuously regardless of the enabling/disabling condition.
If you are using the LT4000 series, and would like to use 2 synchronize outputs for High Speed Counters (2 phase), you must add one HSCX instruction for each output. In this case, the preload value of the HSCX instruction for CH2 will be invalid.