Timer Timer 7 Timer Timer mode of operation: The following modes of timer operation can be selected:
Cumulative measurement following the pulse-width measuring principle (Cumulative measurement as long as input A is active) Cumulative measurement following the cycle-duration principle (Cumulative measurement from rising edge Input A to falling edge of Input A) Cumulative measurement A=Run, B=Stop (cumulative measurement from rising edge Input A to rising edge Input B) Single-pulse measurement following the pulse-width measurement prin ciple (Measure as long as Input A is active) Single-pulse measurement following the cycle-duration principle (Measu rement from rising edge Input A to rising edge of Input A) Single-pulse measurement A=Run, B=Stop (Cumulative measurement from rising edge Input A to rising edge Input B) 7.1 Timer Description (Supplementing the General Description in Chapter 4) Function:
The timer counts seconds, minutes or hours. Depending on the resolution (see below) the smallest units to be recorded are 0,1 ms. Combined with the prescaler (see below), quantities can be measured as a function of time. Time formats: 4 time formats are available: Seconds, minutes, hours and HH:MM:SS Manual Start / Stop via keyboard: The Start / Stop function can be programmed via the keyboard. Start: Press the UP button for 0.5s Stop: Press the DOWN button. Resolution: By shifting the decimal place, a resolution of up to 4 decimal places can be programmed; the smallest resolution is 0,1 ms. The time format “seconds with four decimal places” shows 0.1 milliseconds.
The time format “seconds with three decimal places” shows milliseconds. The time format “minutes with two decimal places” shows 1/100 minutes Output signals –Function: A coincidence signal: The timer operates in the “coincidence” mode, i.e. the output signals are enabled for the programmed period of time after reaching the selected preset value B trail signal: P 2 and P 0 operate in the “coincidence” mode, i.e. the output signals are enabled for the programmed period of time when reaching the se lected preset value. P 1 is a trail preset and not absolute to 0, but relative to P 2. If the setting is F8=1, the following will apply: Signal 1 is returned at P 2 – P 1 Example:
P 2=1000, P 1=200, Signal 1 at 800; If P1 is negative: P 2=1000, P 1=(-200), Signal 1 at 1200 If the setting is F8=2, the following will be applicable: Signal 1 is returned at P 2 + und – P 1 (Example: P 2=1000, P 1=200, Signal 1 at 800 or/and 1200) C range signal: P 1 and 2 are range signals: Signal 1 is active at timer reading Signal 2 is active at timer reading > P 2 Prescaler: During the timer operation the prescaler has to be disabled or set to 01,0000. The prescaler can be used to record quantities, provided that the quantity per time unit is known. Example: A volume of 3 liters per second is supplied. Settings: Time format “seconds”, prescaler 3,0000 Display:
Supplied volume in liters as a function of time. The prescaler cannot be used with the time format HH:MM:SS as it is not active (effective) in this format. 66 67