Siemens LOGO! Manual page 156

LOGO! functions
4.4 Special functions list - SF
Depending on your configuration of parameter Q, the output is either reset with a signal at
input R or Ral ("Q→0:R"), or when a reset signal is set hi, or the En signal is set lo
("Q→0:R+En").
Viewing the MI, MN and OT values
● LOGO! Basic: You can open the parameter assignment mode when the system is in RUN
to view the actual values of MI, MN and OT.
● LOGO! Pure: In LOGO!Soft Comfort, you can use the Online Test to read these values.
For further information, see chapter "AUTOHOTSPOT".
● In LOGO!Soft Comfort you can get the hours counter via the "Tools -> Transfer: Hours
counter" menu command.
Limit value of OT
The value of the operating hours in OT is retained when you reset the hours counter with a
signal at input R. The hours counter OT will be reset to zero with a transition from 0 to 1 at
Ral. The hours counter OT continues the count as long as En = 1, irrespective of the status
at the reset input R. The counter limit of OT is 99999 h. The hours counter stops when it
reaches this value.
In programming mode, you can set the initial value of OT. MN is calculated according to the
following formula when reset input R is never enabled: MN = MI - (OT % MI). The % operator
provides an integer division remainder.
Example:
MI = 30h, OT = 100h
MN = 30 - (100 % 30)
MN = 30 -10
MN = 20h
In runtime mode, the value OT can not be preset. If the value for MI is changed, there would
be no calculation for the MN. MN would take on the value of MI.
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Manual, 10/2017, A5E01248535-AA
LOGO!