Unit 5 Lab Assignment

Name

Institutional Affiliation

Date

Part I

These are the instructions that will modify the program to ensure that Pump 2 does not run while Pump 1 is running.

Step1

Add “Normally Closed Contact” of “Magnetic Contractor” designated to “Pump 1” in series of “Pump 2” Supply.

Or Step 2

Add “Normally Closed Contact” of “Magnetic Contractor” designated to “Pump 2” in series of “Pump 1” Supply.

Part II

The problem

The PLC program shows as follows:

To consider the program shown in figure 13.3 is supposed to excute to sequentially turn PL1 off for 5 seconds and for 10 seconds when input A is closed.

Input A-1:1/0, PL1-0:2/0, Internal Relay-B3:1/0 andTimers-T4:2 & T4:3 are the given data as the circuit to operate as program is the ladder logic description.

By examining the above information, it is that when the input A is closed then PL1gets off at all the time. But it won’t be off during the short pulse of time in order to subset the timer T4:3. The operation of programmed circuit is explained as follows;

In order to make the program work properly, it is good to change the address of the conditional contact B3:1/0 which is responsible for controlling T4:3/DN. Therefore, when input switch A is closed subsequently PL1 get turned off for 5 seconds and then turn on for 10 seconds. Thus, the program will operate properly and efficiently.

Reference

Guo, L., & Pecen, R. (2009). Design projects in a programmable logic controller (PLC) course in electrical engineering technology. The Technology Interface Journal/Fall, 10(1)