Rievtech EXM-12DC-DA-R-HMI, Руководство пользователя, Страница: 248 / 443

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Q = 1, if Cnt >= On
Q = 0, if Cnt < Off.
If the on threshold < off threshold, then:
Q = 1, if On <= Cnt < Off.
Caution
The function polls the limit value of the counter once in each cycle.
Thus, if the pulses at the fast inputs (ELC-12) or IB/IC(ELC-18) are faster than the scan cycle time, the SFB
might not switch until the so specified limit has been exceeded.
Example: Up to 100 pulses per cycle can be counted; 900 pulses have been counted so far. On = 950; Off =
10000. The output is set in the next cycle, after the value has reached 1000.
The output would not be set at all if the value Off = 980
6.5.14 Hours counter
Short description
A configured time is triggered with a signal at the monitoring input. The output is set when this time has
expired.
Connection Description
Input R A positive edge (0 to 1 transition) at input R resets output Q
and sets a configured value MI at the counter for the
duration of the time-to-go (MN).
Input En En is the monitoring input. X-Messenger scans the on-time
of this input.
Input Ral A positive edge at input Ral (Reset all) resets both the hours
counter (OT) and the output, and sets the configured value
MI at the counter to for the duration of the time-to-go (MN).
That is,

Output Q = 0,

The measured operating hours OT = 0, and

The time-to-go of the maintenance interval
MN = MI.
Parameter MI : Maintenance interval to be specified in hour units
Range of values: 0000...9999 h