Ot - Operating Hours Counter - Eaton easyE4 series Manual

6. Function blocks
6.1 Manufacturer function blocks

6.1.1.3 OT - Operating hours counter

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General
easyE4 base devices provide 4 operating hours counter func-
tion blocks, OT01 through OT04. These function blocks output
minutes and seconds in addition to hours. A comparison with a
reference value that can be entered makes it possible, for
instance, to signal when maintenance work is due.
The counter states are retained even when the device is
switched off.
Operating principle
The operating hours counter will run as long as input EN has a state of 1. The operating
hours counter's seconds will be output at SC, the minutes at MN, and the hours at QV.
The second and minute values will run from 0 to 59, and the hour values will run from 0
to 596,523 h.
The operating hours counter features a comparison function. The corresponding ref-
erence value needs to be connected to I1. With every call, the value of the operating
hours counter will be compared with the value at I1. The operating hours counter fea-
tures a direction input, D_.
If the operating hours exceed the reference value at I1 when counting up, function block
output Q1 will switch to 1 as long as the number of operating hours is greater than or
equal to the reference value.
If, on the other hand, the operating hours fall below the reference value at I1 when
counting down, function block output Q1 will switch to 1 until the number of operating
hours is greater than the reference value.
The operating hours counter can be preset to any value you want. This value needs to
be connected to SV and applied with a wising edge at SE.
The operating hours at QV will not be reset to zero unless reset input RE is activated.
An operating mode change between STOP/RUN, supply
voltage ON/OFF, deleting the program, editing the program,
loading a new program: None of these actions will clear the
operating hours counter's actual value.
However, operating hours will not be added if the program is
not running.
The actual value can only be cleared by using the reset input.
easyE4 11/18 MN050009 EN www.eaton.com