Features:
A PLUS control's main purpose is to operate outputs in a manner that simulates cam switches. The drawing to the right illustrates the operation of a cam switch. Its function is to switch the load on and off at the same rotary positions of the cam shaft during each revolution of that cam shaft. The rotating cam shaft is driven by a machine at a 1:1 ratio, so that the on / off positions of the cam switch always match specific positions in the machine cycle. However, cam limit switches have the following disadvantages: unreliable (wear), hard to adjust (machine must be stopped during adjustment), and they cannot run at high speeds because of contact bounce and excessive mechanical wear. PLUS controls overcome these basic cam switch problems. They have no moving wear parts, they are easy to adjust from the keyboard with the machine running or stopped, and they can operate at speeds up to 3000 RPM. They also add many capabilities far beyond simple cam switch logic
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