The function block FB_Counter provides up and down counting of events.
The following graphic shows the pin diagram of the function block FB_Counter:
The TwidoEmulationSupport library provides a function block FB_Counter which calls the function block CTUD. The standard CTUD behavior is extended by a preset value handling and Twido-compliant overflow behavior.
For more information on counters refer to the CoDeSys online help in EcoStruxure Machine Expert Standard Library / Counter.
The table describes the input variables of the function block in the TwidoEmulationSupport library:
|
Input |
Data Type |
Description |
|---|---|---|
|
i_xLoad |
BOOL |
Sets the current value to the preset value. |
|
i_xReset |
BOOL |
Resets the input. |
|
i_xCountUp |
BOOL |
Counts up the input. |
|
i_xCountDown |
BOOL |
Counts down the input. |
|
i_iPreset |
INT |
Preset value Default: 32767 |
|
i_etMaxVal |
ET_TimerCounterMaxVal |
Counter and preset maximum value |
The table describes the output variables of the function block in the TwidoEmulationSupport library:
|
Output |
Data Type |
Description |
|---|---|---|
|
q_xUnderflow |
BOOL |
Counts down underflow / empty |
|
q_xDone |
BOOL |
q_iCounterValue = i_iPreset / preset reached / done |
|
q_iCounterValue |
INT |
Current value (0..32767) |
|
q_xOverflow |
BOOL |
Up-count overflow full |
