Omron VARISPEED V7 Guide De Démarrage Rapide page 36

Selecting Input Method
When connecting sequence inputs (S1 to S7)
with transistor, turn the rotary switch SW1
depending on the polarity (0V common: NPN
side, +24 V common: PNP side).
Factory setting: NPN side
Selecting Sequence Input Method
By using SW1, NPN or PNP input can be selected as shown below.
(Default setting)
EN-7