Friday, June 12, 2009

Normally Open and Normally Close from Input Equipments PLC





Picture for Normally Open (NO) and Normally Close (NC) Switch :

PLC

Picture for Normally Open (NO) and Normally Close (NC) Limit Switch :

PLC

Definition Contact Normally Open (NO) :
For Switch or Limit Switch Without Lamp :
If Switch In Depressed then signal into PLC is ON ( 1).
If Switch is Not In Depressed then signal into PLC is OFF ( 0).

For Limit Switch With Lamp :
If Lamp Light Then signal into PLC is ON ( 1).
If Lamp Not Light Then signal into PLC is OFF ( 0).


Definition Contact Normally Closed (NC) :
For Switch or Limit Switch Without Lamp :
If Switch In Depressed then signal into PLC is OFF ( 0).
If Switch is Not In Depressed then signal into PLC is ON ( 1).

For Limit Switch With Lamp :
If Lamp Light Then signal into PLC is OFF ( 0).
If Lamp Not Light Then signal into PLC is ON ( 1).



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