User manual CARLO GAVAZZI UA 18 CLD CONFIGURATION

[. . . ] If a target approaches the sensor, the output will change when the distance equals the setpoint. If the target moves back from this point, the output changes back when the distance equals the setpoint + hysteresis. Collect and Save values By choosing this, a new window opens. Write sensor parametres The parametres of the actual displayed settings are written in a file on disc. [. . . ] With the programming of the cycle time, the response time of the sensor can be adjusted to the application. The duration of the cycle time must be longer than the time needed to receive the echo of the transmitted pulse!Tmeasure is proportional to the distance to the object (from the pulse is transmitted and until the echo is received). Tmeasure is a proportional expression for the distance; therefore the time is converted to a distance, expressed as an analogue value. A guideline for maximum distance for a given cycle time is: Cycle time (ms) 4 8 16 32 64 Distance (m) 0. Under Range Under range can be adjusted in steps from 0 to 255 cm. During transmission the sensor cannot receive, and therefore the length of the transmission pulse determines the shortest detection distance. This range, limited by the length of the transmission pulse, is called the blind zone. A sensor can detect targets for example through a protecting grid without being disturbed by the reflections from this grid. Echoes of a massive target in the dead zone will be suppressed but 2nd or 3rd echoes can be received if the time is longer than the programmed dead zone. The output will indicate a distance which is 2 or 3 times longer. If the next measurement or new value is within this measurement window, it will be used to calculate the new distance which then will be read-out. The new value is used as the centre of a new measurement window. Two counters, `A' for the read-out of the actual distance and `B' for the login, are reset to 0. If the next measurement or new value is outside the window this measurement will be ignored and the distance output will remain unchanged. A counter counting the number of measurements outside the window is increased by 1. If the Logout Counter A is below 3 (programmable), the program jumps back to the start and a new measurement is made. if it is higher than or equals 3 , the Login Counter B is increased. If B = 1, the measured value is assumed to be the new distance and a new measurement window is created. The program jumps back to the start and a new measurement starts. If B > 1 and the new measurement is outside the new measurement window, B is set to 1 and the program jumps back to the start and a new measurement starts. If B = 4 (programmable), the new measurement is realised as the new distance. [. . . ] if no echo is received , the over range counter ORC will be increased. If ORC is below the parameter p, there will be no changes in the output and the sensor will transmit a pulse during the next measurement cycle. If ORC is equal to or higher than p, the outputs will be changed to over range, and the sensor will transmit a pulse during the next measurement cycle. In the start modus, a separate window can be opened, where distance and status of switching output is displayed. [. . . ]