How does electronic control control pressure?

Simply put, the low-cost method is to use the electric contact pressure gauge. When the bending pressure reaches the ideal value (that is, the upper limit pressure set by your electric contact pressure gauge), turn on the time relay and release the feed pressure after the delay arrives.

When the feed pressure is released to the lower limit of the electric contact pressure gauge, the feed process ends and the oil cylinder retreats.

When the upper limit of the electric contact pressure gauge is connected, the intermediate relay is controlled to be connected. Can be self-locking, through the contact of time relay to cut off the work. It can also be self-locked or not by the rear circuit. After this process is completed, it will be cut off by the next process.

This arrangement is also made when the lower limit of the electric contact pressure gauge is connected.

This is good for wiring, not confusion.

The complex point is that pLc is used to control and pressure sensor AD is used to convert the pressure value. This cost is dozens of times higher. You must be able to program and calculate.

In fact, the first method is enough for the technological requirements you mentioned.