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

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

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

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

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

the counter output is switched on.

Accordingly,its normally open contact will close.

which can be used to drive a Y output coil.

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

to reset the counter.

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

The device identifier of a counter is C,

followed by its address.

For example C0, C1, C2 and so on.

A counter is a bit type device.

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

The counter device address format is decimal.

It means that its numeric address is 0 to 9

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

16 bit counters are Up Counters.

There are two types of 16 bit counters.

That is, the normal counter and the retentive counter.

In a normal counter, once