Ten of the total 26 keys are equipped with LEDs. The additional keys simplify numeric input and allow the function keys to be available for application-specific functions. Two variants of the PP15 are offered, depending on the number of I/O points on the device. The first model provides 16 integrated digital inputs and outputs. Its inputs can partly double as counter and encoder inputs. The second variant is equipped with four analog inputs and outputs, in addition to the eight original inputs and outputs. The PP15 can access additional decentralized I/O points or servo drives via a CAN interface.
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