5. Two double-acting cylinders composed into a system as shown in Figure 4 a), such that if both cylinders are extended,

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: 5 Two Double Acting Cylinders Composed Into A System As Shown In Figure 4 A Such That If Both Cylinders Are Extended 1 (70.62 KiB) Viewed 46 times

a) System of two pneumatic cylinders. b) Interface of its
controller function block.
i) Develop controller of the system as a Moore state machine.
[6p]
ii) Implement the state machine as an ECC of the basic function
block, whose interface is
shown in Figure 4, b). [4p]
5. Two double-acting cylinders composed into a system as shown in Figure 4 a), such that if both cylinders are extended, they can collide in the middle. The desired behavior of the system: upon pressing of button START1, the horizontal cylinder shall make one trip to its end position and then return back. Upon pressing of button START2, the vertical cylinder shall make one trip to its end position and then return back. In the initial state both cylinders are retracted and both buttons are enabled, indicated by the lamps lighting behind them. During the trip, both buttons shall be disabled, indicated by the absence of light behind the both. To avoid the collision, if one cylinder is moving, the other shall remain still. List of the system's variables is as follows: Controller inputs Controller outputs Name Description Name Description HOME1 Left position of cylinder 1 FWD1 Open push valve of cylinder 1 END1 Right position of cylinder 1 RET1 Open pop valve of cylinder 1 HOME2 Left position of cylinder 2 FWD2Open push valve of cylinder 2 END2 Right position of cylinder 2 RET2 Open pop valve of cylinder 1 START1 Button to start cylinder 1 LED1 Lamp behind the START1 button START2 Button to start cylinder 2 LED2 Lamp behind the START2 button Table 1: List of inputs and outputs. FWD2 HOME RET2 EVENT INIT INITO O EVENT EVENT - REG CNF Q EVENT O Two CICTL Emôi CH HOME FWD10- BOOL BOOL -06 END1 RETR10- BOOL BOOL 00START1 LEDI 00- BOOL BOC HONE FWD2 00 BOOL BOOL - END RETR2 0 BOOL BOOL -06 START2 LED2 DHE BOOL END2 FWD1 RETT X STEET LED2 HOME 1 ENDI STARTI FN1 a) b) Figure 4: a) System of two pneumatic cylinders. b) Interface of its controller function block. (6p) i) Develop controller of the system as a Moore state machine. ii) Implement the state machine as an ECC of the basic function block, whose interface is shown in Figure 4, b). [4]