The following graphic shows the pin diagram of the function block FB_Timer:
The function block %TM in EcoStruxure Machine Expert - Basic can configure 3 types of timers:
oTON (Timer On-Delay): this type of timer is used to control on-delay actions.
oTOF (Timer Off-Delay): this type of timer is used to control off-delay actions.
oTP (Timer-Pulse): this type of timer is used to create a pulse of a precise duration.
For more information refer to the CoDeSys online help in EcoStruxure Machine Expert: CoDesSys-Libraries/Standard Library/Timer.
NOTE: When changing the timer type online while i_xEnable is TRUE, the formerly selected timer type is reset and the new timer type starts. FB outputs behave according the newly selected timer.
The TwidoEmulationSupport library provides a function FB_Timer, which calls the timer type TON, TOF or TP depending on the input i_etTimerType. The given TimeBase is used for calculating the preset time.
The table describes the input variables of the function block in the TwidoEmulationSupport library:
|
Input |
Data type |
Description |
|---|---|---|
|
i_xEnable |
BOOL |
Rising edge starts counting up q_iCurrentValue. |
|
i_iPreset |
INT |
Initial value of the preset value (0..32767) |
|
i_etTimerType |
ET_TimerType |
Indicates the timer type: TON, TOF, or TP |
|
i_etTimeBase |
ET_TimerTimeBases |
Time base of 1 ms, 10 ms, 100 ms, 1 s, 1 min Default: 1 min |
|
i_etMaxVal |
ET_TimerCounterMaxVal |
Maximum value |
|
i_xRetentive |
BOOL |
Behavior of the timer: oTRUE: timer keeps value of the output q_iCurrentValue when disabled, and continues counting from previous value when enabled again oFALSE: timer resets the output q_iCurrentValue after disable |
The data type for the input variable i_etTimerType is:
TYPE ET_TimeType:
(
TON := 1, // On-delay Timer
TOF := 2, // Off-delay Timer
TP := 3, // Pulse Timer
) INT;
END_TYPE
NOTE: If an invalid value is given to i_etTimerType, then q_xOutput stays at FALSE and q_iCurrentValue stays at 0.
The data type for the input variable i_etTimeBase is:
TYPE ET_TimerTimeBases:
(
tb1MS := 1, // 1 millisecond time base
tb10MS := 2, // 10 millisecond time base
tb100MS := 3, // 100 millisecond time base
tb1S := 4, // 10 second time base
tb1M := 5, // 1 minute time base
) INT;
ET_TYPE
The data type for the input variable i_etMaxVal is:
TYPE ET_TimerCounterMaxVal:
(
Val9999 := 0, // Value 9999
Val32767 := 1 // Value 3267
) INT
END_TYPE
The table describes the output variables of the function block in the TwidoEmulationSupport library:
|
Output |
Data type |
Description |
|---|---|---|
|
q_xOutput |
BOOL |
Timer output |
|
q_iCurrentValue |
INT |
Elapsed time |
