Omega Products D6100 User Manual

MODBUS® Serial Interface Modules

D6000 Series

U Complete Data Acquisition Systems
U Analog and Digital I/O Models Available
U RS485 Serial Communications Interface
U MODBUS
U Up to 25 Conversions per Second
U 500 Vrms Analog Input or Analog Output Isolation
U 16-Bit Analog Input Measurement Resolution
U Continuous Self-Calibration;

No Adjustments Required

U Programmable Analog Input Digital Filters
U Requires 10V to 30 Vdc Unregulated Supply
U Transient Suppression on Serial

RS485 Data Lines

U Removable Screw Terminal Plug

Connectors Supplied

Applications

U Process Monitoring and Control
U Remote Data Logging to any Host Computer
U Product Testing
U Direct Connection to PLC

The D6000 Series modules are a family of complete
data acquisition modules for use in process control
systems. The analog input models can measure
process signals such as thermocouples, 4 to 20 mA
loops, and discrete contact closures. The analog
output models can generate voltage or current signals
for controlling annunciators or valves. The digital input
and output models can sense the state of remote
digital signals or control solid state relays. Complete
data acquisition systems can be created with ease
with the D6000 modules and a host supervisory
computer or programmable logic controller.

The modules provide direct connection to a wide
variety of sensors and annunciators. They perform
all signal conditioning and linearization and contain
no pots or DIP switches. All user-selectable settings,
such as ranges, communications settings are stored
in nonvolatile EEPROM, which maintains these values
even after power is removed.

The D6000 series modules communicate with a
host computer using the MODBUS RTU protocol.
The MODBUS RTU protocol is widely recognized
throughout the data acquisition industry by and
supported by almost all commercially available
process control programs and supervisory host PLC’s.

®

RTU Protocol

D6200, shown
smaller then
actual size

This binary protocol communicates via a two-wire
RS485 serial interface. The key to the product concept
is that the modules are easy to connect and use. You
do not need engineering experience in complicated
data acquisition hardware. With the modules, anyone
familiar with a personal computer can construct a data
acquisition system.

This modular approach to data acquisition is very
flexible, easy to use and cost effective. The modules can
be mixed and matched to fit your application. They can
be placed remote from the host and from each other.

The D6000 series is completely hardware compatible
with the D1000M, D1700M, D3000M and D5000M series
modules. Meaning, they can all be mixed and matched
on one RS485 serial communications line. Each module
is identified by a unique user-programmable address.
This addressing technique allows modules to be
interrogated in any order.

ANALOG INPUT MODULES

The D6100 through D6400 Series analog input modules
contain seven input channels and make up a complete
data acquisition system. Each unit contains analog
signal conditioning circuits optimized for a specific input
type. The amplified sensor signals are converted to
digital data with a microprocessor-controlled integrating
A/D converter. Offset and gain errors in the analog
circuitry are continuously monitored and corrected using
microprocessor techniques.

The analog input modules output the resultant digital
data as unsigned integer percentage of full-scale values
that are compatible with the MODBUS RTU protocol.
The modules continuously convert data at the rate of
up to 25 conversions per second and store the latest
result in a buffer. Host processors may request data by
sending a MODBUS query to the module. The D6000
series modules will instantly respond by communicating
the memory buffer data back to the host processor. Up
to 247 modules may be linked to a single RS485 port.

To Order, Call or Shop Online at omega.com

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1

D6500 shown smaller
than actual size.

ANALOG OUTPUT MODULES

The D6500 analog output modules contain two 12-bit
digital to analog converters (DAC) for generating either
voltage or current output signals. The output signal
type for each DAC is user selectable and each DAC is
independently controlled via a host computer using the
MODBUS RTU protocol. Two voltage and two current
ranges are available.

The D6500 analog output modules also contain
programmable features such as output slew rate,
a communications watchdog timer, programmable
startup signal value, and an 8-bit analog to digital
converter for analog readback the output signal. The
communications watchdog timer can be used to move
the analog output signal to a known “safe” condition in
the event of a communications failure.

D6720 shown smaller
than actual size

DIGITAL OUTPUT MODULES

The D6720 digital output modules contain 15 individual
open-collector transistor outputs for controlling
annunciators, lamps, or other devices that require an
ON/OFF signal.

The D6720 digital output modules also contain
programmable features such as a communications
watchdog timer and programmable startup signal
values for each bit.

The communications watchdog timer can be used
to move the digital output signals to a known “safe”
condition in the event of a communications failure.

D6710 shown smaller
than actual size.

DIGITAL INPUT MODULES

The D6710 digital input modules contain 15 individual
signal inputs for monitoring logic levels, contact
closures, or other ON/OFF signals in a data acquisition
system. Each discrete input terminal contains a pull­up biasing resistor allowing for direct connection to a
set of contacts. The input terminals can accept signals
between ±30 Vdc without damage.

2

To Order, Call or Shop Online at omega.com

D6400 shown smaller
than actual size.

COMMUNICATIONS

The D6000 series modules are designed to
easily interface with computers and PLC’s. All
communications to and from the module are
performed using the MODBUS RTU protocol via an
RS485 interface.

The two-wire RS485 system is a half duplex system,
developed for multi-dropped systems that can
communicate at high data rates over long distances.
RS485 receivers can handle common mode voltages
from -7 to 12V without loss of data, making them ideal
for transmission over great distances.

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