Controls
High-precision timer
The timers of the ZX20 control unit from Zander Aachen are accurate to 1 µs, regardless of whether times of 30 minutes or 1 µs are to be used.
To achieve this, the user program is burnt into an FPGA so that no program runs, but instead complete parallel processing takes place. The programmer does not notice any of this: he creates his program in the familiar PLC language ST (Structured Text) and loads it into the controller as with a conventional PLC. In the current version of Ex_Press 5, the ST development environment for the ZX20 controller family, timers can also be defined as Function_Blocks. A library with several variants is included, but it is also possible to define a timer yourself. The following attributes are integrated or can be configured for the function blocks supplied: Single shot, multiple shot and continuous operation, constant or runtime-variable period, reset, enable/disable and retrigger conditions as well as polarity of the timer signal and start behavior.
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