Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 38, Problem 11RQ
What is the purpose of the key switch located on the front of the CPU in many programmable logic controllers?
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Chapter 38 Solutions
Understanding Motor Controls
Ch. 38 - What industry first started using programmable...Ch. 38 - Name two differences between PLCs and common home...Ch. 38 - Name the four basic sections of a programmable...Ch. 38 - Prob. 4RQCh. 38 - What device is used to program a PLC?
Ch. 38 - What device separates the central processing unit...Ch. 38 - What is opto-isolation?
Ch. 38 - Prob. 8RQCh. 38 - Prob. 9RQCh. 38 - Prob. 10RQ
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- Why are normally closed components such as STOP push buttons programmed normally open instead of normally closed when entering a program into the memory of a PLC?arrow_forward1. A mixing vat has an inlet valve, an outlet valve, a mixing motor, and a single level detecting switch (Figure 1). Both valves are opened by solenoids. The level switch closes when the vat is full and stays closed until the vat is empty. Draw a PLC ladder logic diagram and provide the allocation list to do the following: a. When the start button is pushed, the inlet valve opens until the vat is full. b. The mixer motor comes on for 5 min. c. The outlet valve opens until the vat is empty. (closed) Level switch Motor Inlet valve Outlet valve Float Vat Figure 1arrow_forwardWhat are the four basic parts of a SCADA system. How can you classify the Programmable logic controllers? Why solenoid is used in almost all industrial applications?arrow_forward
- 6.arrow_forwardName Section 5-2: Line Diagrams-Signals, Decisions, and Actions In the following application, a temperature switch controls a heating contactor and a flow switch is used to ensure there is enough air flow. If there is not enough air flow, an alarm is sounded. Complete the required information. 1. List all the signal devices in the circuit. 2. List all the action devices in the circuit. 3. List the decision part of the circuit that automatically sounds the alarm if there is a problem. 4. When the heating element is on during normal operation, is the flow switch open or closed? CIRCULATING 2 L1 FAN TEMPERATURE SWITCH TR HEATING ELEMENTS FLOW SWITCH -HOT AIR PADDLE AIR FILTER NORMALLY CLOSED FLOW SWITCH 65 ALARM (SOUNDS IF NO FLOW FOR 15 SECONDS OR MORE) Date HEATING CONTACTOR TR ON-DELAY TIMER SUPPLY AIR COLD AIR (3) TIME SET= 15 SEC © 2014 American Technical Publishers, Inc. All rights reservedarrow_forwardName two differences between PLCs and common home or business computers.arrow_forward
- I want you to draw a ladder logic diagram of a garage door to control it by PLC. In my case we have different inputs and outputs and all of them gotta be used in the diagram. I can perfectly interpret the diagram so no need to explain it, I will just require you to draw it. INPUTS : open push button ( OPB ) - close push button ( CPB ) - open limit switch ( OLS ) - close limit switch ( CLS ) - obstacle detection sensor ( ODS ) - safety sensor ( SS ) - emergency stop push button ( ESPB ) - reset button ( RB ) OUTPUTS : motor starts ( MS ) - motor stops ( MSTP ) - motor forward ( MF ) - motor reverse ( MR ) - Error display ( ER ) OPERATİNG MODES : automatic mode ( AM ) - manual mode ( MM ) NECESSARY TIMERS : T1 ( delay door movement after obstacle detection ) - T2 ( delay door movement after reversing ) Here is my excercise for today. Please I am requiring a good logic diagram taking into consideration all what was mentioned before. so to sum up, I want you to write a logic ladder diagram…arrow_forwardPlease define specialty models and basearrow_forward11). Controllers can be divided into _____________ type, and _____________ type controllers due to their different design methods.arrow_forward
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