A Counter is a device that counts the number of objects or the number of operations. It is called a Counter because it counts the number of ON/OFF signals input from an input device, such as a switch or sensor.
It is fairly simple for people to count ten or twenty objects, but larger numbers make counting increasingly difficult. Counters outperform people when it comes to counting accurately
Counters are classified into two groups according to whether they produce an output or not.
A Preset Counter counts until the present value reaches a preset value, and then it activates a control output to operate an output device.
The term preset in Preset Counter means that you can set a value in advance.
A Total Counter does not output a control signal. It only displays the present value.
A Total Counter is often used when you only have to display a production count, for example.
A timer is a control device that outputs a signal at a preset time after an input signal is received.
The operating mode determines the output method that is used when the set time has reached.
There are different operating modes like as ON-DELAY, FLICKER, OFF-DELAY, INTERVAL and etc…
With ON-delay operation, the Timer receives an input and then an output signal is output by switching the Timer contacts after a set time delay.
This name is used because there is a delay between when the input signal is received (i.e., turns ON) and when the output signal is output.
ON-delay operation is the operating mode most often used for automated machines.
With OFF-delay operation, the output turns ON at the same time as the input and then the output turns OFF when the Timer contacts switch after the set time has expired. The set
time is calculated from when the input turns OFF.
This name is used because there is a delay between when the input turns OFF and when the output turns OFF.
With flicker operation, an output repeatedly turns ON and OFF at the set time after an input is received.
With interval operation, the output turns ON at the same timeas the input and the output turns OFF after a set time.