Pneumatic Hammer Control Using Two Regulators

I am using the s7 1200 to control two pneumatic regulators. These regulators control air to a pneumatic hammer. The Pneumatic hammer is a double piston double acting pneumatic hammer. In addition to the regulator there is a sick sensor for feedback to tell me the position of the piston. The sensor gives a signal with respect to a zero point and an end point set by me. Both regulators are control by a 4-20mA signal and the sensor output is a 4-20mA signal. To control the hammer I have decided to set up both regulators at a bias pressure of 50PSI (rest). To extend the arm I must send 100PSI to one regulator(R1) and vent the other(R2) or send 0PSI. To retract the arm I must do the opposite i.e. Send 0PSI to R1 and 100PSI to R2. There is also a push button that only when pressed the system should hammer. It is similar to ON/OFF solenoid control. I need help in writing the ladder logic to achieve this. Any tips or advice will be greatly appreciated.

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