Passive Inputs; Passive Outputs - Mettler Toledo IND500x Installationsanleitung

An example of how to wire to the active outputs is shown in the figure below.
Figure 34: Active Output Connections

2.5.4.3 Passive Inputs

Using the Discrete I/O option with passive inputs allows connection of an external intrinsically safe voltage
supply (or a standard power supply with barriers) to power switches or other simple devices to trigger an input.
The external power source must meet the requirements of the hazardous areas approval and entity values must
be compared.
Barriers from two manufacturers that have been tested for correct operation with the IND500x and can be
connected directly to the inputs as shown are:
Pepperl & Fuchs #778
Bartec 17-584L-0001/0000
One example of how to wire to the passive inputs is shown in the figure below.
Figure 35: Passive Input Connections

2.5.4.4 Passive Outputs

Using the Discrete I/O option with passive outputs provides the ability to control high voltage solenoids or other
feeding equipment in the safe area through protective devices such as an intrinsically safe switch amplifier. The
external switch amplifier isolates the lines back to the terminal so they remain intrinsically safe while providing
switching of a higher AC or DC voltage. Entity values of the amplifiers must be compared to the terminal output
entity parameters. Cable capacitance and inductance must also be included.
34 Installation​ ​
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Ex Area
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Safe Area
POWER SUPPLY
BARRIERS SWITCHES
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IND500x