User Manual

Inside easy
290
08/04 AWB2528-1423GB
The sixth segment is located outside of the circuit diagram.
easy uses this to:
Evaluating function blocks
• process the function blocks which are used: the output
data of a function block is updated immediately after
processing. easy processes the function blocks according
to the function block list (a FUNCTION RELAYS menu)
from top to bottom. You can sort the function block list
with EASY-SOFT (-PRO) from Version 4.04. You can then
for example, use the results consecutively.
• to establish contact to the “outside world”: The output
relays Q 01 to Q (S).. are switched and the inputs I1 to I
(R).. are read once more.
• easy also copies all the new switching states to the status
image register.
• exchange all data on the easy-NET network (read and
write).
easy only uses this status image for one cycle. This ensures
that each circuit connection is evaluated with the same
switching states for one cycle, even if the input signals I1 to
I12 change their status several times within a cycle.
Effects on the creation of the circuit diagram
easy evaluates the circuit diagram in these six segments in
succession. You should take into account two factors when
creating your circuit diagram.
h
The following must be observed when operating a PID
controller function block!
The cycle time of the program must be less than the scan
time of the controller. If the cycle time is greater than the
controller scan time, the controller will not be able to
achieve constant results.