GE Fanuc MLFLLPL11E10HL00 Brand NewAnd Original

Asynchronous Control

The execution of fieldbus related blockware in the controller does not depend upon the reception of inputs from the linking device and does not attempt to synchronize with the fieldbus macrocycle. Once the ToolboxST application calculates the minimum macrocycle period necessary based upon the configured logic (the macrocycle period is padded such that it is a multiple of the controller’s frame rate). It then configures each fieldbus related task with a frame multiplier and schedule offset corresponding to the macrocycle period. Since the controller clocks and the fieldbus link times are not synchronized, skew can occur and the controller may be executing on inputs from the previous macrocycle. While this leads to less responsive control loops since it can take effectively two macrocycles to react to changing input stimulus, this approach allows fieldbus tasks to connect blocks from devices on multiple segments upon multiple linking devices

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