Mettler Toledo IND231 Manuel D'installation page 35

2.4.8.3. Discrete I/O Option
This option board provides two isolated inputs and four dry-contact, normally open, relay outputs.
The inputs can be selected as either active or passive, depending on the position of the slide switch
indicated in Figure 2-40.
2.4.8.3.1. Discrete I/O Switch
A switch on the Discrete I/O board selects if the inputs will be active or passive. Ensure that the
switch is set properly before wiring to the inputs. The location of the switch and the active/passive
positioning are shown in Figure 2-41.
30094756 | 04 | 02/2021
Connector to
Main board
Connector to
Four Outputs
Figure 2-40: Discrete I/O Option Board
Passive
Figure 2-41: Discrete I/O Switch
METTLER TOLEDO IND231/IND236 Installation Manual
D I/O Mode Switch
Connector to
Two Inputs
Active
2-21