Abstract
In many practical applications PLC engineers face the problem, that some essential hardware the PLC is supposed to operate, is not available during software development and commissioning, yet. Because of missing feedback signals from field, testing the control software can in such circumstances be very difficult, if ever possible. The purpose of the paper is to propose a certain method of programming, which enables the programmer to overcome the problem, at least partially. The key point of the method lies in replacing feedback signals generated by real hardware and sampled at PLC inputs, by signals generated inside the PLC by a special program block, performing software simulation.
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