Description - WAGO 750-461 Manual

Item-No.
Resistance measuring
750-461/000-002 2 AI Resistance
750-461/000-007 2 AI Resistance
Operating mode configurable with WAGO-I/O-CHECK
750-461/003-000 2 AI PT100/RTD/

2.1.2.3 Description

The 750-461 analog input module and its 750-461/xxx-xxx variations allow
Pt or Ni Resistive Temperature Devices, RTDs, to be measured in the field.
It can also be used to measure resistances in the field.
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 operating mode of the 750-461/003-000 variation can be set by using the
WAGO-I/O-CHECK 2 start-up and diagnostic tool (Item No.: 759-302). The
default setting is Pt 100. After setting the parameters, the module behaves like
the version with the selected operating mode.
The operating mode of the 750-461 basic module described in this manual is
for a Pt 100 resistance sensor.
The analog input module is a 2- to 3-conductor device and has 2 input
channels. Two devices may be directly connected to the module.
For example, two 3-wire sensors can be connected either to +R1, RL1 and –
R1 or to +R2, RL2 and –R2.
For the connection of 2-wire sensors, putting of a bridge is necessary between
+R1 and RL1 or +R2 and RL2.
The shield (screen) is directly connected to the DIN rail. A capacitive
connection is made automatically when snapped onto the DIN rail.
An optocoupler is used for electrical isolation between the bus and the field
side.
The operational readiness and trouble-free internal data bus communication of
the channels are indicated via a green function LED. A broken wire, short-
circuit or overrange are indicated by a red error LED per channel.
WAGO-I/O-SYSTEM 750
I/O Modules
750-461, (/xxx-xxx) [2 AI Pt100/ RTD]
Designation
Measuring, 10R-1k2
Measuring, 10R-5k0
Adjustable
Description
Description
2-Channel Analog Input Module,
Resistance measuring,
Measuring range: 10 Ω ... 1,2 kΩ
2-Channel Analog Input Module,
Resistance measuring,
Measuring range: 10 Ω ... 5,0 kΩ
2-Channel Analog Input Module,
Adjustable; Factory preset: Pt 100
Measuring range: -200 °C ... +850 °C
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