July 2004
Intermediate to advanced
352 pages
9h 30m
English
Content preview from Mitsubishi FX Programmable Logic Controllers, 2nd Edition
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//INTEGRAS/ELS/PAGINATION/ELSEVIER UK/PLC/3B2/FINALS-7-6-04/0750656794-CH007.3D – 78 – [71–90/20] 19.6.2004
9:08PM
5. With the operation of Y0, the furnace will now star t to heat up.
6. When the furnace temperature reaches the lower temperature setting, then thermo-
stat T
L will open and therefore Input X2 will be OFF, but since the contact Y20 is
closed this will ensure that the Output Y0 remains energised and hence the furnace
will continue to heat up.
7. When the furnace tempe rature reaches the upper temperature setting, then thermo-
stat T
U will open and therefore Input X3 will now be OFF. This causes the Y0 latch
circuit to be broken, which
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