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Circuit diagram elements
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02/16 MN05013001Z EN
The easySafety control relay can be connected locally or via
easyNet with a non-safety I/O expansion device. These non-
safety I/Os are only read, processed and written by the
standard circuit diagram.
Further information on expansion options is provided in
chapter “Expanding an easySafety device” from page 627 as
well as in chapter “Introduction to the easyNet network”, on
page 521.
Function blocks
Function blocks are program blocks with special functions.
Examples: emergency-stop relays, timing relays, time
switches. Function blocks are provided with or without
contacts and coils. How a safety or standard function block
is added to the safety or standard circuit diagram and
parameterised is described in „Working with function
blocks“ on page 155.
In RUN mode the function blocks are processed according to
the circuit diagram and the results are updated accordingly.
Examples:
Timing relay = Function block with contacts and coils
Time switch = Function block with contacts
Relays
Relays are switching devices that are emulated in easySafety
device electronically, which activate their contacts according
to the assigned function. A relay consists of at least one coil
and contact.
h
A easySafety device is primarily a configurable safety relay,
and this is why the safety circuit diagram is obligatory.
Without it, the device could not fulfill any safety function
and therefore any configuration without a safety circuit
diagram is rejected as invalid.
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