First of all, you have to know that ladder logic has contacts that make or break circuits to control coils. Each control coil or contact corresponds to the status of a single bit in the programmable controller’s memory. However, you can use these instructions to check if something is true, because they are conditional instructions. In the IECuino online ladder platform, you can use the blocks to draw your diagram.
NO (Normally Opened) Control Contact
Usually, when we energize the coil or input that controls the open contact, it closes.
(Open contact at rest)
NC (Normally Closed) Control Contact
Generally, when we do not energize the coil or input that controls the NC contact, it closes. (Closed contact at rest)
An output control coil is used to turn a bit on and off. The instruction itself even has a place in the PLC memory. Consequently, the PLC will show the result of the instruction. In general, inactive coil is energized whenever its rung is closed.
(Inactive at rest).
Pulse timers are used to produce a fixed-duration output from some initiating input. When there is an input to In 1 simultaneously there is an output from Out 1 and the timer starts. As a result, the timer contacts open when the predetermined time has elapsed.
Firstly, we have to know that counters are used in many different applications. Some of them count from scratch and have a change in output status upon reaching a predetermined value; on the contrary, others count down from a preset value of zero to provide an exit status change.
However, some counters can operate in up and down counting mode, state of the state of an input pin of up / down counting mode.
Counters are synchronous, but are asynchronous presets. Four data inputs (A – D) allow loading the preset target. The counter decreases or increases synchronously with the low to high transition of the clock. Also, there is the high-speed mode for cascading the meters
The difference between an up and a down counter, of the ports that are connected to the display. For up counters, the non-inverted output, Q, is connected to the display. While for a downstream counter, the inverted output, nQ, is connected to the display.
You can take a look at the IECuino available tools ⚒️ to know more about the online ladder editor.