14 Device Description
WAGO I/O SYSTEM 750 XTR
750-481/040-000 2AI RTD Ex i XTR
Manual
Version 1.1.0
3
Device Description
The Analog Input Module 750-481/040-000 (2AI RTD Ex i XTR) processes
signals from resistance sensors that are operating in hazardous environments of
Zones 0 and 1.
Resistance thermometers (RTD), as well as resistors and
potentiometers can be connected.
Depending on the operating mode, the resistance value is converted to a
temperature or directly sent out by the module. A microprocessor within the
module is used for converting and linearizing the measured resistance value into
a numeric value proportional to the temperature of the selected resistance
sensor.
The parameterization description can be found in the appendix in Section
“Configuration and Parameterization via GSD File with PROFIBUS DP and
PROFINET IO.”
Installation only in zone 2 or in non-hazardous environments!
The installation of the WAGO I/O SYSTEM 750 fieldbus couplers/controllers and
I/O modules is only to be done in zone 2 or in non-hazardous environments.
To fulfill Ex i regulations, only passive transducers, that means without their own
voltage supply, like adjustable resistances, pressure, flow and level meters, may
be connected to the input module.
The transducers are directly supplied from the I/O module.
The module has two input channels allowing the direct connection of two 2- or 3-
wire resistance sensors.
For example, two 3-wire sensors can be connected either to +R1, RL1 and
−
R1
or to +R2, RL2 and
−
R2.
Ex i XTR I/O modules shall only be supplied via “Power Supply 24 VDC
Diagn for Ex i XTR Modules”
Ex i XTR I/O modules shall only be operated with a “Power Supply 24 VDC
Diagn for Ex i XTR Modules” 750-606/040-000.
Do not exceed maximum current via power contacts!
The maximum current available from the “Power Supply 24 VDC Diagn for Ex i
XTR Modules” 750-606/040-000 is 1 A.
When configuring the system, ensure that this current is not exceeded.
If exceeded, an additional 750-606/040-000 must be used.
The assignment of the connections is described in the “Connectors” section.
