Mitsubishi MELSEC-F FX-TRN-BEG-E, User Manual

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FX-TRN-BEG-E C: Easy Does It! 3
B-33
3.4.3 Points of training and control specifications
1) Basic operation of the counter
The counter in the PLC is expressed with the device number and the set value.
Set value : Expressed in decimal. K precedes the value.
Present value : Increments from 0 until it reaches the set value. (To monitor select "Online"
→
"Monitor” in the ladder menu.)
Reset : Returns the current value of the counter to 0, and sets OFF the contact of
the counter (RST instruction).
• For each count input received (*A), the current value of the counter is incremented by 1.
When the current value reaches the set value, the contact of the counter turns ON (*B).
• After the counter reaches the set value, the current value is not changed even if the
count input (*C) is set ON and OFF, and the counter contact remains ON (*B).
• When the counter reset instruction (RST) is set ON, the current value of the counter
becomes 0 (*D) and the contact turns OFF. While the RST instruction is ON, any count
input is not counted (*E).
• When the RST instruction is set OFF, count inputs are counted. However, if the RST
instruction is set ON before the current value of the counter reaches the set value, the
current value is reset to 0 and thus the counter contact does not turn ON (*F).
Count input
C0
C0
Y003
K5
2
Set value
Current value
Reset input
C0 RST
Counter reset instruction
Counter contact
Count input
OFF
ON
0
1
2
3
4
5
OFF
ON
0 0
1
2
OFF
ON
*F
*D
*B
*A
*C *E
C0
Current value
C0 contact
(Y003)
Reset input