Instructions: be programmed directly using RSLogix. You must create a new progra
ID: 1811778 • Letter: I
Question
Instructions:
be programmed directly using RSLogix. You must create a new program file for each problem and setup the proper controller type. Identify each problem with a program file using the following format: E3_x_FML.RSS. Where x is the problem number and FML are your first, middle, and last name initials. Enter the ladder logic on the corresponding window. All symbols must be specified and a description must be added stating the type of device with its normal state (NO, NC). Upload the three (3) .RSS files and submit them through.
Problem 3:
Design a PLC ladder logic program to control the operation of an alarm system using the following sequence:
- An ALARM must be energized and stay energized (latched) when a limit SWITCH is activated once or when a motion SENSOR is activated three (3) times within a space of 30 seconds.
- The ALARM can only be de-energized (unlatched) by pushing a hidden normally-open momentary-contact BUTTON.
- Hint: latch the timer with a sensor activation and use a count-up instruction to count the number of sensor activations. Reset the count and unlatch the timer if the timer is done.
- Program SWITCH, SENSOR, and BUTTON using bits 0, 1, and 2 of the input module respectively.
- Program ALARM using bit 0 of the output module.
Explanation / Answer
Start by attributing addresses to your inputs and your output contacts for the horns; retain internal coils for each activation condition: "2 inputs active", "3 inputs active", "4 inputs active"...
Begin your program by writing one network to test the "4 inputs active" condition, and activate the specified coil.This should cause no problem, simply AND the 4 input signals...
Next do the same for the "3 inputs active" coil. Except that you must make sure that only three inpust are active at the same time (or else the "4 input active" condition will activate the "3 inputs active" coil at the same time, and they must be mutually exclusive).
So you must write logic that could look like this:
(Input1 AND Input2 AND Input3 ANDNOT Input4)
OR
(Input1 AND Input2 ANDNOT Input3 AND Input4)
OR
(Input1 ANDNOT Input2 AND Input3 AND Input4)
OR
(NOTInput1 AND Input2 AND Input3 AND Input4)
Then "3 inputs active" coil is active
Write similar logic for the "2 inputs active" coil, ant note there are more combinations to be checked...
Now that you have 3 mutually exclusive coils (they will not be active at the same time), create 3 rungs activating the required horn on each specific condition, as required.
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