Ladder - Using Counters

XG5000 has various counter function blocks. Below is a table giving a description of each counter function block.

Counter Function Block Name Description
CTD_DINT Down counter function block that decreases to min of DINT (-2,147,483,648)
CTD_INT Down counter function block that decreases to min of INT (-32,768)
CTD_LINT Down counter function block that decreases to min of LINT (-9,223,372,036,854,775,808)
CTD_UDINT Down counter function block that decreases to min of UDINT 0)
CTD_UINT Down counter function block that decreases to min of UINT (0)
CTD_ULINT Down counter function block that decreases to min of ULINT (0)
CTR Ring counter function block.
CTU_DINT Up counter function block that increases to max of DINT (2,147,483,647)
CTU_INT Up counter function block that increases to max of INT (32,767)
CTU_LINT Up counter function block that increases to max of LINT (9,223,372,036,854,775,807)
CTU_UDINT Up counter function block that increases to max of UDINT (4,294,967,295)
CTU_UINT Up counter function block that increases to max of UINT (65,535)
CTU_ULINT Up counter function block that increases to max of ULINT (2^64-1)
CTUD_DINT Up/Down counter function block that increases/decreases to range of DINT (-2,147,483,648 ~ 2,147,483,647)
CTUD_INT Up/Down counter function block that increases/decreases to range of INT (-32,768 ~ 32,767)
CTUD_LINT Up/Down counter function block that increases/decreases to range of LINT (-9,223,372,036,854,775,808 ~ 9,223,372,036,854,775,807)
CTUD_UDINT Up/Down counter function block that increases/decreases to range of UDINT (0 ~ 4,294,967,295)
CTUD_UINT Up/Down counter function block that increases/decreases to range of UINT (0 ~ 65,535)
CTUD_ULINT Up/Down counter function block that increases/decreases to range of ULINT (0 ~ 2^64-1)

Help Files for Counter function blocks can be found easily from the Function/Function Block insert screen.

Step Action
1 Insert a function/function block from the Scan Program.
2 Choose Counter category.
3 Select the Counter function block to view help on.
4

Press Help button.
5

Review the Counter Function Block Help file.

XG5000 treats counters as a function block. A counter function block requires an instance variable to be used.

The outputs of a counter can be used without creating separate variables. This is done by ‘counter_instance_name.output_name’.

For example: Counter1.Q

 

 

 

 

 

 

 

LP303