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Welcome to part 7 of Mitsubishi PLC GX Works 
2 tutorial.

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Our topic for this tutorial is about the 
16-bit Up Counter.

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Counters count the signal pulses that are 
applied to their inputs.

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For example these signal pulseswill be counted 
up by an Up Counter.

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When the counter value reaches the setpoint 
value for example 10,

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the counter output is switched on.

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Accordingly,its normally open contact will 
close.

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which can be used to drive a Y output coil.

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For the counter value to return to zero,an 
input device is needed

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to reset the counter.

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A reset [RST] instruction is required in 
the program.

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The device identifier of a counter is C,

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followed by its address.

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For example C0, C1, C2 and so on.

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A counter is a bit type device.

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Therefore its possible output is 0 or 1, 
or On and Off.

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The counter device address format is decimal.

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It means that its numeric address is 0 to 
9

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This is not the same with input contacts 
and output coils where the address is in 
octal system.

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16 bit counters are Up Counters.

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There are two types of 16 bit counters.

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That is, the normal counter and the retentive 
counter.

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In a normal counter, once