Question: In the manual operation of a sheet metal stamping press, a two-button safety interlock sys-tem is often used to prevent the operator from inadvertently actuating the press while his hand is in the die. Both buttons must be depressed to actuate the stamping cycle. In this sys-tem, one press button is located on one side of the press while the other button is located on the opposite side. During the work cycle, the operator inserts the part into the die and de-presses both push-buttons, using both hands.

(a) Write the truth table for this interlock sys-tem

(b) Write the Boolean logic expression for the system.

(c) Construct the logic network diagram for the system.

(d) Construct the ladder logic diagram for the system.