Device Description - WAGO I/O-SYSTEM 750 Manual

WAGO-I/O-SYSTEM 750
750-484 2AI 4-20mA HART Ex i
3

Device Description

The Analog Input Module 750-484 processes analog signals with the norm value
of 4 ... 20 mA from intrinsically safe sensors, operating in hazardous
environments of zone 0+1.
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.
The I/O module also enables digital communication to be carried out with HART-
enabled field devices (Highway Addressable Remote Transducer).
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 measurement input is equipped with current limitation, which limits the
current to 25 mA.
The I/O module 750-484 (2AI 4-20mA HART Ex i) allows the connection of 2-wire
technology sensors. The sensors are connected via "HART +" and "HART −".
They are supplied by the I/O module's field supply.
The I/O module has 2 input channels and enables field signals to be received via
the +HART 1 and −HART 1 and +HART 2 and −HART 2 connections. Typically,
the current values are measured at these connections, but at the same time the
HART signals can also be coupled and decoupled.
The operating status of the channels is indicated by a green status LED per
channel.
A red fault LED per channel indicates a wire break or that the signal is outside
the measuring range.
The meaning of the LEDs is described in the "Display Elements" section.
The channels have a common reference potential and a shield connection.
The shield connection is fed directly to the carrier rail and contact is made
automatically by snapping the module onto the rail.
The channels are not electrically isolated from one another.
Device Description
Manual
Version 1.4.0
13