WAGO-I/O-SYSTEM 750 Device Description 13
750-421 2DI 24V DC 3.0ms, diagnostics
Manual
Version 1.2.0
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3 Device Description
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The digital input module 750-421 (2DI 24V DC 3.0ms, diagnostics) receives
control signals from digital field (e.g. of sensors, transmitters, switches or
proximity switches).
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The I/O module has 2 input channels, providing a direct connection to 2- or 3-
wire sensors.
The sensors are connected to the following CAGE CLAMP
®
terminals: DI 1,
Uv 1 and 0 V, or DI 2, Uv 2 and 0 V.
Each sensor can be supplied separately over the outputs Uv 1and Uv 2.
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The assignment of the connections is described in the “Connectors” section.
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Connection examples are shown in section “Connecting Devices” > … >
“Connection Example(s)”.
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Each input channel has a 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 24 V 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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A red error-LED indicates a short circuit to ground.
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The meaning of the LEDs is described in the “Display Elements” section.
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In case of a short circuit, one error bit (bit 2 or bit 3) is assigned to every channel
in the input data process image. By means of this bit the supervisory control can
detect the error.
After the error has been eliminated, the module will acknowledge automatically.
With a delay of 100 ms (pulse extension), the error bit in the input process image
is reset and the error LED goes out after the acknowledgement.
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The I/O module 750-421 (2DI 24V DC 3.0ms, diagnostics) receives the 24 V
voltage supply for the field level from an upstream I/O module or from the
fieldbus coupler/controller via blade-formed power jumper contacts. It then
provides these potentials to subsequent I/O modules via spring-formed power
jumper contacts.
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Do not exceed maximum current via power jumper contacts!
The maximum current to flow through the power jumper contacts is 10 A.
Greater currents can damage the contacts.
When configuring your system, ensure that this current is not exceeded. If
exceeded, insert an additional supply module.
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