Cfc Resources - Siemens SIPROTEC 5 Manual

The remaining white bar shows the function points that have not yet been used up by your configuration. The
number of function points available in a device depends on the device purchase order (position 20 of the
product code). You can also order function points subsequently, and so increase the function-points account
for the device.
NOTE
i
i
Find out the function-points requirement for the desired application before ordering the device. For this,
you can use the device configurator.

CFC Resources

8.2.3
Task Levels of the CFC Function
A CFC chart, and thus the configured CFC function, runs in the SIPROTEC 5 device on exactly one of the 4 task
levels. The individual task levels differ, on the one hand, in the priority of processing tasks and, on the other,
in the cyclic or event-triggered processing of the CFC charts.
You can select between the following task levels:
Task Level
Fast Event-Triggered
Event-Triggered
Measurement
Interlocking
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.
SIPROTEC 5, Fault Recorder, Manual
C53000-G5040-C018-5, Edition 11.2017
Description
Use the Fast Event-Triggered task level for time-critical tasks, for
example, if a signal should block a protection function within 2 ms to 3 ms.
Functions on this task level are processed in an event-triggered way with
the highest priority. Each change to a logical input signal is immediately
processed. Processing can interrupt the execution of protection functions
and functions on the Event-Triggered task level.
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.
Use the Measurement task level for processing measured values. Functions
on this task level are processed cyclically every 500 ms.
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.
Supervision Functions
8.2 Resource-Consumption Supervision
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