Task Level Description
Event-Triggered
Use the Event-Triggered task level preferably for logic functions that
need not be executed with highest priority. Each change to a logical input
signal is immediately processed. Protection functions or functions on the
Fast event-triggered task level can disrupt processing.
Functions on the Event-Triggered task level are typically processed
within a maximum of 5 ms in all devices. For busbar protection or line
protection, the functions on the Event-Triggered task level are
processed within a maximum of 10 ms.
Measurement
Use the Measurement task level for processing measured values. Functions
on this task level are processed cyclically every 500 ms.
Interlocking
Use the Interlocking task level preferably for logic functions that should
be executed with lower priority than functions in the Event-Triggered
task level. If the available ticks of the Event-Triggered task level shown
in the following figure are sufficient for the required CFC functionality, you
do not need to use the Interlocking task level.
All CFC function blocks can be assigned to all the task levels. There are no device-specific function blocks. If
enough ticks are available, all CFC charts can be created in the same task level. A tick is the measure of the
performance requirement of CFC blocks.
The number of available ticks for each task is calculated depending on the created device configuration. This
calculation is based on the previously described load model. In this process, it is recommended to create all
selected functions and objects first followed by configuration of the CFC charts so that a realistic information
about the remaining system capacitance for CFC charts is available. Significantly exceeding the typical
response time is prevented by the load model by limiting the number of CFC function blocks in the corre-
sponding task level via the number of ticks available.
The typical response times for CFC tasks are listed in the Technical Data.
The following figure shows an example of the CFC chart capacitances in DIGSI calculated by the load model.
The ticks available for each task are shown here. The green bars represent the ticks used in the task levels. You
reach this dialog with the following call: Device → Device information → Resource consumption.
[sc-cfc-statistic, 1, en_US]
Figure 8-3 CFC Statistics
Supervision Functions
8.2 Resource-Consumption Supervision
936 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
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