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Cable Length and Wiring
The maximum permissible length of the bus cable depends on the communication baud rate and the
cable used. See the following equation and table below for mixed cable use.
In addition, the configuration of the wiring system must comply with the rules for trunk and drop cable
configuration and length. The following are basic wiring rules:
• 120Ω terminating resistors are required on each end of the trunk line in accordance with ODVA
standards.
• The trunk must be configured as a linear bus or daisy chain. Star and ring structures are not
allowed.
• Drop lines may be as long as 20 ft. (6m) and may contain branches.
Calculate the maximum length of mixed cables using the following equation:
L
Thick
+ 5*L
Thin
= 1640 ft. (500m)
L
Thin
must not exceed 512 ft. (156m)
Table 3-DeviceNet Cabling Requirements
DeviceNet Cable Maximum Length
Baud Rate
Thick Thin Drop Line All Drop Lines
125 kbps 1640 ft. (500m) 328 ft. (100m) 20 ft. (6m) 512 ft. (156m)
250 kbps 820 ft. (250m) 328 ft. (100m) 20 ft. (6m) 512 ft. (156m)
500 kbps 1640 ft. (500m) 328 ft. (100m) 20 ft. (6m) 512 ft. (156m)
Equipment Setup
1. Connect the DeviceNet trunk cable to the DeviceNet scanner interface being used.
2. Connect the ECIO-DN or ECOM-DN DeviceNet I/O Module to the network using the DeviceNet
terminals on the front of the unit.
Check that the 24VDC power supply disconnect switch is ON and that 24VDC is present on the
DeviceNet network cable (V+ and V- at any location).
SOFTWARE CONFIGURATION
Quick-Start Guide Using Cutler-Hammer’s CH Studio
EDS and ICO Files
EDS (electronic data sheet) files are required for DeviceNet network and DeviceNet master software
configuration. An EDS file contains information about configurable attributes for a device, including
object addresses of each parameter.
The ICO file includes an E777 overload relay icon to personalize the configuration software.
The EDS and ICO files are available on Cutler-Hammer’s website at www.cutlerhammer.com > USA
> Products > Motor Control > Overload Relay > Eaton 777 (E777) Solid-State Overload Relay -
DeviceNet EDS. Upload the EDS file to your system to access relevant files.
Network Setup
Open CH Studio
Click Tools > Device Manager to open the Device Manager dialog box. Click Import… and open the
EDS file you uploaded. The file will be imported—then Close the dialog boxes to get back to the
project.
Click on the Location drop-down menu and choose DeviceNet. Click the Go Online icon on the
menu bar. CH Studio will search for devices on the network. The ECIO-xxx-DN or ECOM-DN should
appear on the screen—click on it to view its properties.
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