SMC Networks PFM7 Series Operation Manual page 34

●External input–auto shift, auto shift zero function
Auto-shift and auto-shift zero are functions in which the output and display operate according to the
amount of change in the instantaneous flow rate from a reference value set when an external input signal
is applied. If auto-shift zero is set, the display value is set to zero when the external signal is input.
See Operation example below.
<E.g.>This function is used during the confirmation of adsorption/release when there are flow rate
changes due to source pressure fluctuation or nozzle diameter changes. If there is flow rate
variation during adsorption/release and the auto-shift function is not used, then the output will not
switch correctly. When the auto-shift function is used, the operation of the switch output is based on
the flow rate at the time when auto-shift input is applied. Therefore, reliable output switching will be
achieved as long as the auto-shift input is applied during the non-adsorption period.
When auto-shift is not used
Product: PFM710, switch set value: n_1 = 1.6, H_1 = 0.4 (reversed output, hysteresis mode)
ON/OFF point at these settings ...•ON point: n_1
When auto-shift is used
Product: PFM710, Switch set value: n_1 = -1.0, H_1 = 0.4 (reversed output, hysteresis mode)
ON/OFF point at these settings ...•ON point: (Flow when auto-shift is input) + (n_1)
•OFF point: (n_1) + (H_1)
•OFF point: (Flow when auto-shift is input) + (n_1) + (H_1)
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No.PF※※-OMJ0006-G