Description - WAGO 750 Series Manual

2.1.3.2 Description

The analog input module 750-461/020-000 evaluates NTC 20kOhm resistance
Temperature Devices, RTDs.
The resistance value is converted to a temperature. 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 analog input module is a 2-conductor device and has 2 input channels.
Two devices may be directly connected to the module.
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.
After the error has been corrected, the module needs up to 4 seconds to output
a correct measured value.
Any configuration of the input modules is possible when designing the
fieldbus node. Grouping of module types is not necessary.
Attention
This module has no power contacts. For field supply to downstream I/O
modules, a supply module will be needed.
The analog input module can be used with all couplers/controllers of the
WAGO-I/O-SYSTEM 750 (except for the economy types 750-320, -323, -324
and -327).
WAGO-I/O-SYSTEM 750
I/O Modules
750-461/020-000 [2 AI NTC 20kOhm] • 29
Description