EC1. Please complete the following (2 points) a. What value(s) stored in N7:2 of
ID: 2291226 • Letter: E
Question
EC1. Please complete the following (2 points) a. What value(s) stored in N7:2 of Figure below b. would make this instruction true? r LIM LIMIT TEST Low limit Test High limit 200 N7:2 100 EC2. (2 points) Assume that the NC stop button is replaced with an NO stop button and that the pro- gram is changed so it operates as before. Should the field wire connected to one end of the stop but ton break off: Ladder logic program Inputs Ouput L2 L1 Stop Start M OL alo so -o o-Start Starter Starter A. the motor would stop automatically. B. pressing the stop button would stop the motor. C. pressing both the start and stop buttons would stop the motor. D. none of these.Explanation / Answer
solution:
Ec 1.a) N7:2 is an integer type data format , one can assign any value in the range from (-32768 to 32767 ) or (0 to 65535 )
Ec1. b) The figure represents a limit function and the block output will be true , if it satisfies the below condition.
condition : low limit < test value < high limit
i.e. the test value should be more than the low limit and less than the high limit, to get instruction true .
condition : 200 < N7:2 < 100 As there is no such integer is present that is more than 200 and less than 100, the condition does not satifies for any given value in N7:2. So instruction will never become true with this condition.
Ec 2) If the stop button is NC, then the above circuit behaves as a latch circuit.
As all the switches are pushbutton switches, when the switch is pushed, it will change its state and whenever switch released immediatly it will comeback to its default state.
So , when you press and release the start button in latch circuit, motor will remain in ON state because of the contact of motor in parallel with the start button. Motor will remain in ON state till you break the connection of motor to main signal. The only possibility is to open the NC button. So , when you press the stop button , the motor will get off.
In the above circuit , the NC stop button replaced with NO, so if u press both start and stop then maotor start , but when you release , the motor will get off automatically , because of no signal continuity.
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