Mettler Toledo IND131 Guide D'installation page 53

Active/Passive
slide switch
Figure 2-45: COM2/Discrete I/O (Relay) Option Board
2.4.5.2.1. Active Input
Selecting the inputs as active enables connection of switches or other simple devices to trigger an
input. No voltage is supplied by the external simple device. The active and passive positions of the
selector switch are shown in Figure 2-46.
Active Position Passive Position
Figure 2-46: Active/Passive Input Switch
2-30 METTLER TOLEDO IND131/IND131x/IND331/IND331xx Installation Manual 64067480 | 11 | 05/2018