Rockwell Automation 1771-DB BASIC MODULE - Manual (Page 336)

Product Overview
Appendix A
A –4
Diagnostic Features
The BASIC module has 10 indicator LED indicators. Use these LED
indicators for diagnostics and operator interface. Refer to Appendix C for
more information on troubleshooting.
DH485
PRT2
PRT1
LED Indication
ACTIVE
indicates the module mode and whether the BASIC module
is receiving power from the backplane
FLT
indicates whether a system power problem was detected
during background diagnostics
DH485
indicates whether port DH485 on the BASIC module is
active for communication
BTLO
indicates whether the voltage of the battery that backs up
RAM is low
LED1 user definable. LED activated through the user program.
LED2 user definable. LED activated through the user program.
PT1X
indicates whether port PRT1 on the BASIC module is
transmitting signals
PT2X
indicates whether port PRT2 on the BASIC module is
transmitting signals
PT1R
indicates whether port PRT1 on the BASIC module is
receiving signals
PT2R
indicates whether port PRT2 on the BASIC module is
receiving signals
Appendix