Allen-Bradley 1769-SDN, Installation Instructions Manual, Page: 47 / 68

Rockwell Automation Publication DNET-IN001B-EN-P - January 2012 47
1756 DeviceNet Status Indicators and Data Structures Appendix A
1756-DNB DeviceNet
Scanner Alphanumeric
Display The 1756-DNB scanner has an alphanumeric display that provides diagnostic
information about your module through status messages and status codes. The
display flashes messages and codes at approximately one-second intervals.
Table 5 - OK Status Indicator
Status Description
Off The device is not powered.
Apply chassis power, and verify the module is completely inserted into the
chassis.
Solid green The device is operating normally and has at least one connection to it from a
controller.
No action is necessary.
Flashing green
(1)
The device is operating correctly, but no controller is controlling it.
Verify that the 1756-DNB scanner module is properly configured in the
controller’s I/O configuration.
Solid red One of the following conditions exists:
• The device is in Self-test mode.
In this case, wait until the test completes.
• During powerup, the device has experienced an unrecoverable fault.
In this case, complete these steps.
1. Wait for the device to complete its power-up sequence.
2. If the device appears to have completed its power-up sequence and the
indicator remains solid red, cycle power.
3. If after cycling power the status indicator still remains solid red, replace the
device.
(1) The flash rate of the status indicator is approximately 1 flash per second. The status indicator should be on for
approximately 0.5 seconds and off for approximately 0.5 seconds.
DeviceNet
TM
MOD/NET I/O OK
Alphanumeric Display