A start signal is generated for parallel-synchronous operation of three substantially identical data processing units (1), an array of three identical unit outputs (6) parallel-synchronously assuming concurring binary states, or a plurality of output arrays (7) transmitting mutually like data words, respectively. Due to individual random start-ups (2), the units are caused to perform in parallel mutually different data processes. Each of three EXOR-responsive bit comparators (10) or word comparators (10), respectively, are connected via the output arrays (6,7) to two of the units. The start signal is sent from an AND-element (9) having its inputs connected to three monostable elements (12), the inputs of which are connected to the bit comparators, or is sent from an AND-element (9) which has its inputs connected to the word comparators, respectively.
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