Answer Posted / cae
Plc basically contains Inputs and outputs along with CPU. programme written in ladder logic or in any other language like FBD,ST,IL it is stored in PLC memory which deals with CPU. Field sensors are connected to the input card of plc as a reference signal or getting feedback from the field by sensors. so according to the logic plc sends a signal to the output card which correspondingly enables the Electrical output,it may be a motor contactor coil or drive through a relay for safe operation and plc sends the output signal with very low voltage level enough to enrgize the relay coil or contactor coil or an SSR(solid state relay) This is the way how plc gives commands to electrical. and ***Communication plays a vital role for plc operation
| Is This Answer Correct ? | 2 Yes | 0 No |
Post New Answer View All Answers
I WANT BHEL PREVIOUS QUESTION
How can claculate to attain the desired PF in the line ( HOW Much KVAR is required ) Pls Give the formula? Equate Petrochemical 0 1 how to calculate sizing of NGTR (Transformer rating,Loading resistor value and Current rating of resistor) and what is the X/R ratio. Details : 11kV,Capacitance 1.73532 micro farads,40kA for 1sec. 0 1 What will happened. if we feed 3phase supplay to the stater with out insert the rotor. How much current will flow through the stater winnding? Equate Petrochemical 0 1 What is required of exietation to the alternater. 0 1 why star point of HT motor not earthed? Equate Petrochemical 0 1 Why we are getting low voltage in star connection? Equate Petrochemical 0 2 What's ND relay & it's functions? Equate Petrochemical 0 2 How instantanious short circuit current is calculated? its formula? Equate Petrochemical 0 2 What is servo Motor? What's the advantages of this motor over Induction motor? Equate Petrochemical 0 2 What is core CT & it's function? Equate Petrochemical 0 3 what is meant by star/delta voltages as 440/220 in a 3 phase induction motor, and why it should be connected on STAR IN 3 PHASE SUPPLY L & T 0 4 What is required of exietation to the alternater. KNB 1 23 what is the design voltage for 6.6KV 2000 KVAR HT capacitor? Consultancy 0 3 Pls explain about vfd control?Where it is used, Give some example? siemens 1 22 Please explain me abt PQ diagaram in the power sector. 0 9
explain PV modules in solar energy generation.
what is effect of length of air gap on performance of dc motor and generator?
What happens when two positively charged material is placed together?
How to calculate loses in transformer of 160 KVA ?
How to findout raw or ups power? its not indicated in socket,
Enlist four components of electrive drives.
what is the use of the circle diagram
Is there chopping current in resistive circuit
Define corner frequency?
Batteries. What is the difference between Lead and Nickel batteries ?
explain the Trip supervision circuit
As we use capacitior bank in 3ph ckt for improvement of PF, why not we use capacitor in single phase domestric use, at our house their are many inductive equipments,like fan,mixer,tube choke,air conditioner they also draw PF... by using capacitor can they improve PF. if yes--what are advantage and how to connect a capactor in single ph,and which type of capacitor if no- what are disadvantages.
How can we connect additional batteries to three phase ups? What are parameters we have to check when connecting?
