BECKHOFF ILxxxx-B520 - Manual (Page 35)

Indicators and Switches
ILxxxx-B520 32
the second sequence indicates the position of the last extension box before
the fault.
In the case of some errors, rectification does not cause the ILxxxx-B520 to
leave the blink sequence. The ILxxxx-B520 stays in the "Stop" state. The
ILxxxx-B520 can only be re-started either by switching the power supply off
and on again, or by a scanner reset.
8.2 Fieldbus / DeviceNet LEDs
DeviceNet Status LED The red/green LED pair provides information about the device and com-
munication status of the ILxxxx-B520. The LEDs acts as the bi-color com-
bined Module/Network Status LED defined in the DeviceNet Specification.
The LED pair is located next to the configuration interface for adjustment of
the DeviceNet address (MacId)
States of Module / Status
LED
LED State Description
Green Flashing Boot Up OK, Device has executed Duplicate MacId Check and
is ON-Line. The ILxxxx-B520 is not allocated by a Master /
Scanner, no Data Exchange with a Master / Scanner
Green ON No Error, ILxxxx-B520 is allocated by a Master / Scanner, Data
Exchange (Explicit or IO) with Master / Scanner is OK
Green OFF - Bus Sense Error (24V DeviceNet Voltage in not available)
(all LEDs off, including IO-Run, IO-Error LEDs)
- No BaudRate, ILxxxx-B520 is not able to detect BaudRate
(IO-Run, IO-Error LEDs On)
Red Flashing Time Out, IO-Connection has timed out
Red ON - Duplicate MacId Fault, check for same Address in Network
- Bus-Off, check cabling, check bus termination, check bus
length
- Receive/Transmit Overrun, reduce IO-Cycle Time / Interscan
delay at Master / Scanner
Red OFF - Bus Sense Error (24V DeviceNet Voltage in not available)
(all LEDs off, including IO-Run, IO-Error LEDs)
- No BaudRate, ILxxxx-B520 is not able to detect BaudRate
(IO-Run, IO-Error LEDs On)