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Inside EZD
MN05013005E
386
The sixth segment is located outside of the circuit diagram.
EZD 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.
EZD processes the function blocks according to the
function block list (
J
FUNCTION RELAYS menu) from top
to bottom. You can sort the function block list with EZSoft.
You can then, for example, use the results consecutively.
• 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.
• EZD also copies all the new switching states to the status
image register.
• exchange all data on the EZ-NET network (read and write).
EZD only uses this status image for one cycle. This ensures
that each rung 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.
J
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.
