Task Transition

Purpose

Transfer data between tasks using a double buffer.

Library

System

Description

The Task Transition block is used to influence the execution of a model in a multi-tasking environment (see Task Transitions in Multi-Tasking Mode).

The schematic in Fig. 144 shows a block in a fast task that receives an input from a block in a slow task. If the sample time of the slow task is an integer multiple of the sample time of the fast task, PLECS silently inserts a Delay that operates with the sample time of the slow task in order to ensure that the data is exchanged in a deterministic manner. This introduces a maximum latency of one sample period of the slow task.

Fig. 144 Default task transition with deterministic delay.

If you wish the block in the fast task to receive the data as soon as possible with minimum (but non-deterministic) latency, you need to insert a Task Transition block in front of the receiving block as shown in Fig. 145.

Fig. 145 Task transition with minimum latency.