TRADE FUNCTION : TOTAL ELAPSED TIME TIMER
1. Symbol for the Function in the Tool Bar
2. Symbol for the Function in the Edit / Simulation / Monitoring Page
3. Configuration Windows
3.1. Parameters
4. Description of the Variables for the Function
4.1. Inputs
Default value if not connected : 0
- Control input, Run / Stop control signal for elapsed time
- Reset, Total Elapsed Time Timer is reset to zero
4.2. Outputs
Default value : 0
- Output, Total Elapsed Time output
- Instruction Value, instruction value beyond which the output changes state
- Current Value, current elapsed time count
- Do not use,Output not fonctional for the user (used to store the control input)
4.3. Parameters
- Instruction Value, (see above)
- Unit of Time, choice of 3 time units, 0.1 sec, 1 sec, 1 min
- Mode, operating mode for the timer function
- Memory Function, specifies the behaviour of the timer in the event of loss of the main power supply
5. Operating Modes
- At Mode:
At power up, the output is OFF, the time count is incremented as long as the control input remains inactive. When the count reaches T value, the output changes state (ON). When the RESET input is activated or in the event of a loss of main power, the output switches back to OFF and the time delay T is reinitialised. The manner in which the unit reacts following a main power loss is configured using the "Memory Function" box. When the box is not ticked, a power loss has the same effect as the rising edge for a Reset. When it is ticked, the output recover the value in force before the power loss.
- Ht Mode:
At power up, the output is ON, the time count is incremented as long as the control input remains inactive. When the count reaches the T value, the output changes state (OFF). When the RESET input is activated, or in the event of a loss of main power, the output switches back to ON and the time count value is reset to zero. " Memory Function ": when this box is not ticked, a power loss has the same effect as the rising edge for a Reset. When it is ticked, the outputs recover the value in force before the power loss.
- T Mode :
At power up, the output is OFF, the time count is incremented as long as the control signal remains active. When the count reaches the T value, the output changes state (ON). When the RESET input is activated, or in the event of a loss of main power, the output switches back to OFF and the time count value is reset to zero. " Memory Function ": when this box is not ticked, a power loss has the same effect as a rising edge for a Reset. When it is ticked, the outputs recover the value in force before the power loss.
- Mode Tt:
At power up the output is OFF, a pulse on the control input causes the output to change state (ON) and starts the time delay running. The output changes back to OFF at the end of the time delay (T) or when a second pulse is received on the control input. " Memory Function ": when this box is not ticked, a power loss has the same effect as a pulse on Reset. When it is ticked, the outputs recover the value in force before the power loss and the count continues.
6. Reset
In all modes, the Reset input is capable of inhibiting the function. As long as this input remains activate, the outputs are reinitialised and the time count is initialised. In At, Ht and T modes, the time count is incremented again as soon as Reset is deactivated and depending on the state of the Control input. In Tt mode, the time count is only incremented again once a new pulse is received on the Control input.
7. Function Performance Characteristics
In normal use, the time accuracy of the function is : 1 millisecond. In the event of loss of main power, this accuracy is reduced to the time unit selected by the user for the time delay. If several mains power losses are cumulated, the loss in elapsed time may reach up to several times the unit selected for the time delay.