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y log+ ()

x = atan y ---------------------y---

y 1+

1. A switch will increment a counter on when engaged. This counter can be reset by a second switch. The value in the counter should be multiplied by 5, and then displayed as a binary output using (O:000)
2. Create a ladder logic program that will start when input A is turned on and calculate the series below. The value of n will start at 0 and with each scan of the ladder logic n will increase by 2 until n=20. While the sequence is being incremented, any change in A will be ignored.

n

x =2(log ()1– ) A= B3/10 n= N7:0 x= F8:15

5. The following program uses indirect addressing. Indicate what the new values in memory will be when button A is pushed after the first and second instructions.

A ADD Source A 1 Source B N7:0 Dest. N7:[N7:1]

A

addr

before

after 1st

after 2nd

1

N7:1

2

N7:2

3

plc basic functions -15.27

6. A thumbwheel input card acquires a four digit BCD count. A sensor detects parts dropping down a chute. When the count matches the BCD value the chute is closed, and a light is turned on until a reset button is pushed. A start button must be pushed to start the part feeding.

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