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The following measured values are displayed:
State:
Here the momentary state is indicated, taking into account any inversion of the input. Please note
that the LEDs on the PQM1588 always show the state of the inputs without taking inversion into
account.
Derived variable:
Here the derived variable calculated from the pulse frequency is displayed. If a transducer for a
process variable such as °C, mg/m³, etc. is connected, the measured value is indicated here.
Derived variable avg.:
The value of the derived variable averaged over the number of pulses specified in the input confi-
guration at Averaging the variable calculation over n pulses. This is a rolling average, which enables
a stable measurement reading to be obtained at a high pulse frequency.
Pulses:
The total number of pulses received is shown here. This counter is not resettable.
Counter:
Here the calculated counter reading is displayed.
The consumption figure is arrived at by periodically subtracting the most recently read pulse coun-
ter total from the momentary total and multiplying the difference by the pulse value:
W
diff
= Counter_Mul
×
(Counter_Imp_new – Counter_Imp_old)
W
diff
is then added to the calculated counter reading. A change in the multiplier (e.g. after installa-
tion of a larger current transformer) therefore only affects future pulses.
Counters A/B resettable:
Each input has two separately resettable counters. These can be used, for example, to directly
display the utility consumption during the manufacture of a product or the number of items produ-
ced in that time. To do this, the counter is reset at the start of the manufacturing run.
Time ON/OFF resettable:
These two counters are used to show the time elapsed in the ON and OFF states for the configu-
red unit. Please note that here any inversion is taken into account.
State at input
Inversion
Counter ON
Counter OFF
Open
Not inverted
X
Closed
Not inverted
X
Open
Inverted
X
Closed
Inverted
X
Timestamp reset:
Here the date and time of the last reset are shown for all 3 resettable counters.
