• filtering of input signals (see section 6.3 ); • counting incoming pulses on the device inputs; • convertion of the value from the counter into real physical value; • comparing signal value to the setpoint before displaying; • generation of signals for controlling the outputs according to a specified algorithm. Control unit includes buttons for entering parameters of the device. Display unit displays the measurement results or operating parameters on the indicators and shows the counter status using LEDs.
Secondary power supply converts the incoming voltage for all units of the device, depending on the version (with AC or DC power supply), and generates a signal indicating the loss of supply voltage. The device can be connected with PC using RS-485 and USB interfaces that allow to set and edit the device configuration, monitor its current status and indications. 6.2 Control and indication Elements of indication and control are located on the front panel of the device (see Figures 6.2 and 6.3 ):
• two seven-segment six-digit digital indicators, red and green – see Table 6.1 ; • six/eight LEDs (depending on the construction type) – see Table 6.2 ; • four/five buttons (depending on the construction type) – see Table 6.3 . All elements are placed on two (in housings Щ1 and Н) or on three printed circuit boards (in housing Щ2). 31