Chat with AIExam 10: Programmable Logic Controllers Plcs and Human-Machine Interfaces Hmis
What are smart relays?
(44) 
VerifiedSmart relays have mini processors built in.These relays can often perform multiple timing functions and may offer the ability to control how outputs act,almost like limited PLC systems.
Which PLC company created the PLC-5,the SLC 500,and the ControlLogix line?
(34) VerifiedA
What are the three steps of a sequential scan cycle for a PLC?
(39) VerifiedThe first step is to check all the inputs.For the binary inputs,if the proper amount of voltage is present,it will put a 1 in box in the memory that correlates to that terminals address.If the input is analog,it will put a group of 1s and 0s into a word's worth boxes with the corresponding address,based on the amount of voltage or current present at the terminal.The next step in the sequential scan sequence is to read the program from top to bottom,left to right.The third part of the scan cycle is to connect or disconnect output connections.If the output is digital in nature or the on/off type,a 1 in the data box for that address instructs the output module to make a connection between the designated terminal screw and the common connection.If the output is analog in nature,a specific voltage or amperage is sent to the terminal screw that matches the data in the word of data for that address.
The __________ light,when solidly lit,indicates the processor is running normally.
(38) What are the basic steps of using cell phones to control machine operation?
(39) What is the difference between a contactor and a motor starter?
(40) Communication,PID,safety,and combination are all examples of ____________ modules.
(37) In which mode does the PLC processor scan the program and manipulate data?
(37) 
Filters
- Essay(0)
- Multiple Choice(0)
- Short Answer(0)
- True False(0)
- Matching(0)