Vishay G4, Technical Manual, Page: 5 / 200

G4 Multi Channel Weighing Instrument
1-1
1. Introduction
General
The G4 Instrument is a high performance multi channel weight indicator intended for
industrial systems.
Its basic function is to convert the signals from strain gauge transducers to useful
weight information. Transducer excitation is included as well as parameter controlled
signal processing, indication of output levels, error supervision and operation of
optional external equipment. The instrument can be equipped with up to 6
synchronized weighing channels.
The instrument is modular and can be equipped with different types of I/O units to
match the demands in the specific applications. There are strain gauge transducer
interface modules, a digital input/output module, analog output modules and a
service panel with integrated 24 V DC power supply.
Internal solid-state outputs in the instrument can be used for output functions from level
supervision, setpoints, etc. or ‘In process’ indication, reporting the operating status of
the G4 Instrument.
The CPU unit in the instrument has several communication interfaces. It has two serial
communication ports, an Ethernet port, an USB port and a fieldbus slot.
Several G4 Instruments can be controlled from a master computer or PLC.
Serial communication interfaces are RS-485 and RS-232 for communication with a
computer/PLC (using Modbus RTU protocol) or for transmitting print out data to a
connected printer. The Ethernet interface is using Modbus TCP and the optional
fieldbus interface uses Profibus or DeviceNet.
It is possible to access the instrument, set-up and maintenance functions, remotely
over the Ethernet connection using a Web Browser on a connected PC.
In the Weighing program there are two program options available, one is the Flow Rate
program option and the other is the Scale Batching program option. By entering its
option code a program option is enabled. The option code can be purchased from your
supplier.
It is possible to load new software into the instrument using the USB port.
All functions in the G4 Instrument are controlled by set-up parameters. Setting of
parameter values can be performed via a
service panel with display and 4 keys
(VIEWPAN module). The Rail mount instrument type is powered with 24 V DC. All input
and output signals are galvanically isolated from the power supply by operational
insulation.
CPU
unit
I/O
unit
1
I/O
unit
2
I/O
unit
3
Service panel with
Power supply unit
Backplane
DIN rail mount version
Enclosure & mounting accessories
Block structure of a G4 Instrument