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Working with function blocks
155
02/16 MN05013001Z EN
Working with function
blocks
This chapter describes further on how to add and
parameterise function blocks in the circuit diagram. A
detailed description of all available function blocks is
provided in the sections „Standard function blocks“ on
page 173 and „Safety function blocks“ on page 341. The
function blocks are presented there in alphabetical order.
This section, however, describes some general notes on
working with function blocks.
Function blocks allow you to emulate different devices in
your circuit diagram from conventional safety, open-loop
and closed-loop control technology. Function blocks for
easySafety devices are divided into:
• safety function blocks for implementing safety functions.
• standard function blocks for normal open-loop and
closed-loop control tasks.
The following applies to function blocks:
h
Current actual values are deleted when you switch off the
power supply or switch easySafety to STOP mode.
Exception: retentive data keeps its state (
The most recent actual values are transferred to the
operands every cycle. The data function block is an
exception.
h
If you do not wish to enable others to modify the standard
function blocks, set the enable character from “+” to “–”
when entering the circuit diagram and entering the
parameters, and protect it with a standard password. The
parameters of the safety function blocks are automatically
protected by the master password.
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