Plc Interview Questions

1. Draw system system archit architecture ecture showing showing PLC, SCADA/ SCADA/MMI, MMI, network networking ing devices devices communication rotoco! detai!s !ike IP address etc. ". Draw detai!ed detai!ed #!ock #!ock diagram diagram o$ any $ie!d $ie!d arameter arameter !ike !ike tem, tem, ressure ressure reading reading coming coming to PLC can #e shown on SCADA/MMI. %. &'!ai &'!ain n " wire wire ( ) wire wire wiring wiring conce concet. t. ). Draw #!ock #!ock diagram diagram o$ c!ose c!ose !oo !oo contro!. contro!. Di$$ Di$$erence erence oen oen and c!ose. c!ose. *. Draw Draw server server c!ient c!ient archi architec tectur turee with e'am e'am!e. !e. +. ame ame di$$er di$$erent ent tye tyess o$ timer timerss used used in PLC. PLC. -. Su#rout Su#routine ine,, inst instruc ructio tion n tye tyes, s, . &'! &'!ai ain n PID ID 0. PID Cascad Cascadee mode, mode, rima rimary ry seco seconda ndary ry 1. 2am, $eed $orward $orward 11. ame communication rotoco!s and #asic arameters re3uired to esta#!ish esta#!ish communication #etween two nodes. 1". 4hat is di$$erence di$$erence #etween signa! signa! ground and ower ground 1%. &'!ain &'!ain redundancy o$ contro!!er contro!!er.. 1). Master Master s!ave concet concet in Mod#us 1*. Mod#us addressing addressing 1+. 4hat is is C2C Parity Parity 1-. 5hermocou!e 5hermocou!e 625D 625D di$$erence di$$erence 1. 2oom tem resistan resistance ce $or 25D. 25D. 10. IP Address Address c!asses. c!asses. ". Scan time time o$ PLC. PLC. "1. 4hy )7" )7" ma not 7" ma ma

"". 8um !ess trans$er  1) What are the types of Automation? 2) What is the structure of industrial automation? 3) What are process variables? 4) What is cascade amplier? 5) Describe about !" operation?

1. 4hat is system Architecture ". 4hy we using ).7"mA %. 4hat is ca!i#ration ). 4hat is Sa$ety systems, !ike &SD/SIS/9:S  *. 4hat is ;A25 / 9ie!d#us  +. 4hat is Mod#us / Seria! communication