IFM SM4x00, Operating Instructions Manual

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4.3.1 Display and counting method of the quantity meter
Meter reading:
• The current meter count can be indicated
(→ 11.2) �
• In addition the value before the last reset is saved� This value can also be
displayed (→ 11.2) �
The meter saves the totalled volumetric flow quantity every 10 minutes�
After a power failure this value is available as the current meter reading� If a
time-controlled reset is set, the elapsed time of the set reset interval is also
saved� So the possible data loss can be maximum 10 minutes�
Counter reset:
• There are different ways to reset the quantity meter�
→ 10.3.4 Manual counter reset
→ 10.3.5 Time-controlled counter reset
→ 10.3.7 Counter reset using an external signal
• If the quantity meter is not reset using one of the above-mentioned processes,
an automatic reset will be made when the maximum volumetric flow quantity
that can be displayed is exceeded (overflow)�
Taking into consideration the direction of flow:
• The quantity meter takes account of the flow direction for totalisation� The fol-
lowing counting methods can be defined via the parameter [FPro] (→ 10.5.8) :
[FPro] Counting method
0+ Negative flow values (against the marked direction of flow) are not taken
into consideration for totalling�
– + Negative flow values are subtracted from the consumed quantity�
4.3.2 Consumed quantity monitoring via pulse output
Output 1 indicates a pulse signal when the set volumetric flow quantity has been
reached (pulse value → 10.3.3 )�
Depending on the setting of the counting method [FPro] totalling of the volumetric
flow quantity takes into account the flow in negative direction of flow (– +) or does
not take it into account (0+) → 4.3.1 �