Pulse counter Pulse counter 5 Pulse Counter 5.1 Description of the Pulse Counter (Supplementing the General Description in Chapter 4) Additional totalizer (summation counter) The additional totalizer sums up all values, even if the main counter is conti nually reset. The shift key can be used to switch between the counter reading and the total sum. The totalizer can only be reset manually. To do this, select the total sum from the first row; then press the reset keys. Counter mode: The following counter modes can be selected:
Unidirectional counting, adding or subtracting; Unidirectional counting with directional input; Differential counting, summation (totalizing) or phase discriminator (quad) with single, double or quadruple evaluation. Prescaler Output PSC-out: The prescaler output is an application output. With each increase of the counter reading the number of output pulses corre sponds to the respective number of increments. The pulse length of the prescaler output corresponds to a frequency of 500 Hz. When using the prescaler output the max. count frequency is: F max = 500 / PSC. So it is possible that the maximum input frequency can not be reached. Output signals mode of operation:
1.) coincidence signal: The counter operates in the coincidence mode, i.e. output signals are activated after reaching the Preset value for the programmed period of time. 2.) Trail: P 2 and P 0 are under coincidence operation; they operate as descri bed in item A. P 1 is the trail. P 1 is not absolute to 0, but relative to P 2. Application counter input add / sub The application input may be assigned to the Count Up or Count Down func tion. This is a counter input, which is available in addition to the counter mode ad justed with F1. 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 P 1 is negative:
P 2=1000, P 1=(-200), Signal 1 at 1200 Application Latch/Reset Latch/Reset is an application input. If the counter is reset via the application input, the counter reading is held constant. The counter continues to remain fully functional and operates in the background mode. During the next reset the current (updated) value will be shown on the display. 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) 3.) range signal: VW 1 and 2 are range signals:
Signal 1 is active at a counter reading Signal 2 is active at a counter reading > P 2 5.2 Signal diagrams input signals (PNP-Logic) Unidirectional counting (F1 = C G r) = 0 Intermediate cut: Depending on the application it may become necessary to isolate the main si gnal during the reset, e.g. when the first material lengths or certain lengths showing material defects have to be cut on length-cutting systems. Input A Counter input Input B Gate Input C Reset Counter reading 1 2 3 3 4 5 0 1 38 39