Device Description - WAGO 750 Series Manual

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Device Description

3 Device Description
The analog input module 750-1491 (2AI Resistor Bridge (Strain Gauge)) directly
connects to two resistor bridges.
Connection assignment is described in Section "Connections"; connection
examples are given in Section "Connecting Devices" > ... > "Connection
Examples."
The bridge voltage U
digitized with a 16-bit resolution. The two input channels for the respective
resistor bridge are available as two 16-bit values for additional processing.
The bridge detuning can be determined from the quotients of the two
measurement values U
Use resistor bridges only!
The analog input module 750-1491 (2AI Resistor Bridge (Strain Gauge)) is
designed for connecting two resistor bridges.
Use as a 4-channel module for simple voltage measurement with different
measurement ranges is not intended.
Such use could lead to higher measurement errors.
One green status LED per input indicates the operating status and error-free
local bus communication. One red error LED per input indicates a measurement
underrange/overrange, an overflow/underflow or an internal error. The meaning
of the LEDs is described in Section "Display Elements."
Field and system levels are electrically isolated. Both channels (resistor bridges)
are electrically isolated from one another.
Any I/O module configuration is possible in the design of the fieldbus node, if the
power jumper contacts are taken into account. An arrangement in blocks within
the potential group is not necessary.
The I/O module 750-1491 (2AI Resistor Bridge (Strain Gauge)) can be used with
the fieldbus couplers/controllers of the WAGO 750 I/O System listed in the
"Compatibility List" table starting with the version indicated.
Manual
Version 1.0.0
750-1491 2AI Resistor Bridge (Strain Gauge)
and supply voltage U
d
and U .
d ref
WAGO I/O System 750
of the respective bridge are
ref