GE VersaPoint IC220PBI002, User Manual

Page: 26 / 202

2-10 VersaPoint™ I/O System Profibus-DP NIU User’s Manual – August 2005 GFK-1911B
2
LEDS on the NIU
The diagnostic LEDs on the NIU indicate the type and location of errors.
The module is functioning correctly if all of the green LEDs are on.
Once errors have been removed, the indicators immediately display the current
status.
NIU LED Color Meaning
UM Green On = supply voltage in the main circuit for the NIU,
communications power and interfaces present. Off = main
circuit supply not present.
US Green On = 24 V segment circuit supply present
BF Red On = No communication on Profibus. Off = no error.
Flashing = PLC stopped, outputs default to safe values.
FS Red Defines the function of the FN LED:
FS ON: FN indicates the type of error.
FS OFF: FN indicates the error number
FN Red Off = no error. If flashing, the number of pulses indicates
the type of error or the error number, depending on
whether FS is on or not
Diagnostics
The NIU provides the following standard Profibus and device-related diagnostics.
Error Type Meaning
1 Parameter error on Profibus (SET_PRM telegram)
2 Configuration error on Profibus (CHK_CFG telegram)
3 Configuration error in the station
4 Error within the station
5 Module error
6 Parameter error on local bus
7 EEPROM error