Inside the display system
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1SVC 440 795 M1100
The sixth segment is located outside of the circuit diagram.
The display system uses this for the following:
• Evaluating function blocks
• COM-LINK data access during the program cycle
• Loading visualization data
Evaluating function blocks
• Processing the used function block: The output data of a
function block is updated immediately after processing.
The display system 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 CL-SOFT.
• Contact the “outside world”: Output relays Q 01 to Q
(S)… are switched and inputs I1 to I (R)… are re-read.
• The display system also copies all the new switching states
to the status image register.
• Exchange all data on the CL-NET network (read and
write).
The display system 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 at I1
to I12, for example, change their status several times within
a cycle.
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.
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