5. Programming on the device
5.6 Working with function blocks
Here are some useful tips:
Tips for working with manufacturer function blocks
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Current ACTUAL values are deleted when you switch off the power supply or
switch the easyE4 device to STOP mode.
Exception: Retentive data keeps its state, → Section "Retention function", page
636.
The most recent actual values are transferred to the operands every cycle. The
data function block is an exception.
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If you want to prevent other people from modifying the parameters of the man-
ufacturer function blocks, change the access enable symbol from + to – when
creating the circuit diagram and setting parameters. You can then protect the cir-
cuit diagram with a password.
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Since every function block in the function block list takes up space even if it is no
longer being used and has been deleted from the circuit diagram, you should
clean up things every once in a while.
Check the function block diagram for manufacturer function blocks that are no
longer needed and delete them.
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The manufacturer function blocks are designed so that an output value of a func-
tion block can be assigned directly with an input of another function block. The
32-bit data format is used automatically. This also enables the transfer of neg-
ative values.
The following applies to RUN mode:
A easyE4 device processes the manufacturer function block after a pass
through the circuit diagram. This takes the last status of the coils into
account.
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easyE402/24 MN050009ENEaton.com
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