Mitsubishi Electric MELDAS C6 Programming Manual page 81

(3) Cautions for when using the same counter at two or more positions.
The counter programmed last will be valid even if the counter is set in the subprogram which is
not ladder-processed according to the branch as shown in the following circuit.
M100
M100
P100 M1100
C20
P110 M1100
C20
In the circuit above, when M100 is ON, the subprogram of P110 will not be processed. However,
the value of K30 programmed in the subprogram of P110 will be valid as the C20 counter value.
Therefore, when the circuit above is executed, the counter setting value will be the value of K30,
in other words, Y10 device will be ON after 30 counts although the subprogram of P100
processed.
To make a correct operation, program the circuit as shown in the next page.
5. Explanation of Devices
5.3 Detailed Explanation of Devices
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CALL P100
CALL P110
FEND
NOPLF
C20 K50
Y10
RET
NOPLF
C20 K30
Y10
RET
NOPLF