Siemens6DD1606-4AB0Processor Control ModuleUNIT

Introduction

For interconnections between different cyclic tasks, SIMATIC TDC/SIMADYN D ensures the consistency of all data which is transferred. This means, that all data transferred from a task come from the same computation cycle of this task. All values calculated during a sampling cycle are "exported" at the end of the task. When starting a task, the required values are "imported", whereby it is ensured that there is no overlap (from a time perspective) between reading and writing the values (buffer system). As deadtimes are unavoidable with this concept, a signal should not be routed via several tasks and CPUs - if this can be avoided.

Each function block output in the system is assigned a memory location. The function block saves its computed value in this memory location after being processed. All inputs, which are connected with the outputs in the same task, retrieve their values from the memory locations assigned to the connected output. In order to prevent deadtimes, the blocks of a task should if possible be computed corresponding to the "signal flow“, i. e. that block whose outputs are used as inputs for the following block is first computed etc.

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