Up Counter Instruction In PLC

Up Counter Description :

• Count Up Instruction Use to Increment the Value at Output CV.

• Count Up Input Changes from 0 to 1 (Positive Signal Edge) Current Counter Value Increment at Output CV.
• Counter Value Increment Each Time When Positive Signal Edge Is Detected.
• When Counter High Limit Reached, the Signal State at the CU Input no longer effect on the Count up Instruction.
• Current Counter Value is Greater than or Equal to the Value of the PV Parameter the Output Q is set to Signal State 1.
• When the Signal State at Input R Changes from 0 to 1 the Value at CV Output is Reset to Zero. 

Up Counter Parameters :

Parameter	Declaration	Data type	Description
CU	Input	BOOL	Count input
R	Input	BOOL	Reset input
PV	Input	Integers	Value at which the output Q is set.
Q	Output	BOOL	Counter status
CV	Output	Integers, CHAR, WCHAR, DATE	Current counter value

Up Counter Example :

Up Counter

• When the Signal State of the TAG_1 Changes From 0 to 1, the Count Up Instruction is executed at and the Current Counter Value of the CV Value is Incremented by one.
• Counter Value is Incremented until the High Limit of the Specified Data Type (INT= 32768) is Reached.
• When Current Counter Value is Greater than or equal to Zero the value of the PV Value Output Tag_3 Signal State 1.
• In all other cases, the Output TAG_3 has Signal State 0.
• When the Signal State at Input TAG_2 Changes from 0 to 1 the Value at CV Output is Reset to Zero.