OpenDAC® I/O System
NETWORK INTERFACES
OpenDAC® for Ethernet
FEATURES
• Use Ethernet to Control/Monitor up
to 32 Analog and/or Digital I/O
Channels using OpenLine® I/O
Modules
• NetworkMultipleOpenDACs®
• 10Base-Tand100Base-TXSupport
• Extremely Fast Response Times
overNetwork
• SupportModbus/TCPProtocol
andHTTP
• UseWebBrowserforConfiguration,
Monitoring and Control of I/O
modules
• Diagnostic LEDs
• CE Certified
ETHERNET UNIT ON OPENDAC® SYSTEM
• DIN Rail Mounting
• Modbus TCP
APPLICATIONS
Stand Alone Control
Local Control & I/O
Remote I/O
GENERALDESCRIPTION
EachOpenDAC® incorporatesacommunication
watchdog timer that monitors communication
from the Modbus/TCP master. When the
watchdog is enabled and the slave does not
receive a valid Modbus/TCP message within a
specified time, the OpenDAC® will set all output
modulestothestoredfault-statevalues. Should
a valid message be received, the timer is reset
and communication resumes. All configuration
parameters are displayed and modified using a
web browser. The configuration parameters
are password protected to provide security
against unauthorized access.
The OpenDAC® for Ethernet network inter-
face is a remote slave that responds to
Modbus/TCP commands that it receives over
the network. The status and configuration of
up to 32 OpenLine® analog or digital I/O chan-
nels is stored and constantly refreshed.
OpenDAC® for Ethernet is self-configuring. On
power up, the controller will identify the types
of I/O modules present.The unit will then con-
tinuously scan and update the digital and ana-
log modules. Digital input channels can be
setup for latching operation. The OpenDAC®
for Ethernet supports the OpenLine® Smart
Module Protocol (SMP) that allows field cali-
bration and parameter setup of I/O modules.
Distributed I/O
SCADA
RTU
ANALOG & DIGITAL I/O
MODULES
Each OpenDAC® or third party device on the
network is assigned a unique IP address. There
are three methods of assigning the internet
protocol address -BOOTP, DHCP, and a static
method.Thecontrollerisshippedwiththedefault
IP address of 128.0.0.1. The IP address can be
changedusingawebbrowser. Thewebbrowser
can also be used to select BOOTP or DHCP to
assign the IP address. Communication data
rates are either 10 Mbps or 100 Mbps.
OpenDAC® automatically detects whether it is
connected to a 10Base-T or 100Base-TX
network, eliminating switch settings and
simplifying set up. Network and controller status
can be monitored by status LEDs.
OpenDAC® for Ethernet connects directly to
one or two 16 channel racks. Any combination
of analog and digital I/O modules may be used.
On power up, the OpenDAC® scans and stores
the I/O configuration and makes the information
available to the master.
In addition to simple On/Off instructions, the
OpenDAC® allows you to:
• Read linearized thermocouple and RTD
temperature values
• Detect rising or falling edges
• Latch momentary input events
• Set the level of analog outputs
OpenDAC
2
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com