
WAGO-I/O-SYSTEM 750 Device Description 13
750-402 4DI 24V DC 3.0ms
Manual
Version 1.1.0
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3 Device Description
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The digital input module 750-402 receives control signals from digital field (e.g.
of sensors, transmitters, switches or proximity switches).
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The I/O module has 4 input channels, providing a direct connection to two 2- or 3-
wire sensors. Two additional sensors may be connected via potential distributor.
The input signals are connected to the following CAGE CLAMP®terminals: DI 1
... DI 4, 24 V and 0 V.
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Use field side connection modules!
Where required, use the appropriate field side connection modules for power
supply to the sensors.
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The assignment of the connections is described in the "Connections" section.
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Connection examples are shown in section "Connecting Devices" > "Connection
Example(s)".
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Each input channel has an RC noise rejection filter with a time constant of 3.0 ms.
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The I/O module inputs provide high-side switching. If the 24V potential for field
power is switched to an input connection, the signal status for the corresponding
input channel is set to "high."
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A green LED indicates the switched status of each channel.
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The meaning of the LEDs is described in the “Display Elements” section.
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The I/O module receives the 24 V voltage supply for the field level from an
upstream I/O module or from the fieldbus coupler/controller via the power
contacts used as blade contacts. It then provides this potential to subsequent I/O
modules via the power contacts used as spring contacts.
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Do not exceed maximum current via power contacts!
The maximum current to flow through the power contacts is 10 A.
Greater currents can damage the power contacts.
When configuring the system, ensure that this current is not exceeded. If
exceeded, an additional potential feed module must be used.
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Use potential feed module for Ground (earth)!
The I/O module has no power contacts for PE intake and transfer. Use a potential
feed module when a PE feed is needed for the subsequent I/O modules.
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