Rockwell Automation 1770-HT8 SMART TRANSMITTER - Manual (Page 106)

Chapter
5
5-1
Troubleshooting
To aid in troubleshooting, this chapter tells you how to interpret the
indicators (status LEDs and seven-segment LED displays) on the
Communications Controller (1770-HT1) and the Terminal Blocks
(1770-HT8/16).
If you are unable to save new configurations successfully, the left display
will display hardware fault 6, and the Fault LED on the front will light up.
This indicates a malfunction in the module. If the displays show symbols
other than those shown in this chapter, this also indicates that the module is
malfunctioning. In both cases contact your A-B representative.
The LEDs on the front panel of the Terminal Blocks can help you diagnose
problems during installation and operation.
Table 5.A
Terminal Block LED Indicators
LED: State Probable Cause Recommended Action
LOOP
POWER
(green)*
ON Normal operation None
OFF No power Replace fuse if blown
Ensure wiring to power connector is correct
FLASHING Intermittent contact Inspect power connector wiring for loose wire
BOARD
SELECTED
(green)
ON Normal operation None (will light up when any channel on the
board is being addressed by the
Communications Controller; default address on
powerup is logical address #1)
OFF Not selected None**
* Depends upon a loop power supply being connected to the Terminal Block.
**If communicating but the light is off, check the wiring between the Communications Controller and
the Terminal Block.
Interpreting the Terminal Block
LEDs