Mettler Toledo IND231 Manuel D'installation page 36

2.4.8.3.2. 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.
An example of how to wire to the active inputs is shown in Figure 2-42.
2.4.8.3.3. Passive Input
Selecting the inputs as passive enables other devices such as PLCs to provide the trigger voltage
(typically 12 VDC or 24 VDC, maximum 30 VDC) to turn the IND231/236 inputs "on".
An example of wiring to the passive inputs with the +V to the common is shown in Figure 2-43.
2-22 METTLER TOLEDO IND231/IND236 Installation Manual
NOTES:
1. VOLTAGE IS LOGIC LEVEL 5 VDC. LOW RESISTANCE
CONTACTS RECOMMENDED. MAXIMUM CABLE LENGTH:
20 FEET / 6 METERS.
2.
DO NOT BUNDLE INPUT WIRING WITH POWER WIRING OR
ANY OTHER HIGH ENERGY CABLES.
3.
SWITCHES MAY BE REPLACED WITH RELAY DRY
CONTACTS.
4.
WIRE SIZE: 18 AWG (0.832 mm
24 AWG (0.205 mm
Figure 2-42: Active Input Connections
NOTES:
1. VOLTAGE: 5-30 VDC, 10mA MAXIMUM CURRENT.
VOLTAGE POLARITY MAY NOT BE REVERSED.
2. DO NOT BUNDLE INPUT WIRING WITH POWER WIRING OR
ANY OTHER HIGH ENERGY CABLES.
3. WIRE SIZE: 18 AWG (0.832 mm
Figure 2-43: Passive Input Connections
2 ) MAXIMUM
) MINIMUM
2
) MAXIMUM
2
24 AWG (0.205 mm ) MINIMUM
2
30094756 | 04 | 02/2021