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MELSEC-Q
4 SEQUENCE PROGRAM CONFIGURATION AND EXECUTION
CONDITIONS
(e) When the interrupt program/fixed scan execution type program is executed
at a measuring time such as the scan time or execution time, the values of
the interrupt program/fix scan execution type program are added to the
measured time.
Thus, if the interrupt program/ fixed scan execution type program is
executed, the values stored in the following special registers and
GX Developer monitor values will become longer than when the interrupt
program/ fixed scan execution type program is not executed.
1) Special registers
• SD520, SD521: Current scan time
• SD522, SD523: Initial scan time
• SD524, SD525: Minimum scan time
• SD526, SD527: Maximum scan time
• SD528, SD529: Current scan time for low speed
• SD532, SD533: Minimum scan time for low speed
• SD534, SD535: Maximum scan time for low speed
• SD540, SD541: END processing time
• SD542, SD543: Constant scan wait time
• SD544, SD545: Cumulative execution time for low speed execution
type programs
• SD546, SD547: Low speed execution time
• SD548, SD549: Scan program execution time
• SD551, SD552: Service interval time
2) GX Developer monitor values
• Execution time measurement
• Scan time measurement
• Constant scan
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