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9 Inside 800
9.1 How the 800 device evaluates circuit diagrams and function blocks
9.1 How the 800 device evaluates circuit diagrams and function blocks
318
Control Relay easy800 11/11 MN04902001Z-EN www.eaton.com
Rung
Segment
1
2
I 01----I 04----HW01Q1--T 06Q1-Ä T 01EN
1
I 02----I 03-------------------R Q 02
2
T 01---u-----------------------Ä Q 01
P 01---k
3
4
.. ...
I 12----------------------------Ä Q 08
Segment 1 - 4
The easy800 device evaluates the contact fields within the first four
segments. The evaluation starts in the first segment in circuit diagram line 1
and continues from top to bottom until circuit diagram line n is reached. The
easy800 device then moves to the next contact segment and continues to
evaluate from top to bottom until it has reached the last contact in the fourth
segment. During this process it checks whether contacts are switched in
parallel or in series and saves the switching states of all contact fields.
Segment 5
In the fifth segment the easy800 device assigns all coils in one pass, from
the circuit diagram line 1 - n, with the new switch states from the process
image of the outputs.
Segment 6
In the sixth segment which is outside of the circuit diagram, the function
blocks present in the function block list are evaluated.
The easy800 device uses this sixth segment in order to:
•
process the existing function blocks.
The output data of a function block is immediately up-to-date after it has
been processed.
The function blocks are processed by the easy800 device in the order of
the function block list (￫ FUNCTION BLOCKS menu).
The following requirements must be fulfilled when using particular function
blocks (￫ section 9.4, "Allowing for the special features of function blocks",
page 320).
•
Contact the "outside world": Output relays Q 01 to Q... are switched
and inputs I 1 to I... are re-read. For the expansion modules the S...
output relays are switched and the R... inputs are read accordingly.
•
to exchange easyNet data if this easy800 device receives new read data
or provides new send data (￫ Section 6, "The network Net" on
Page 317).
•
to copy all new switching states to the process image.
3
4
5
6
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