Rockwell Automation 1771-QC , D17716.5.25 SER/B SERVO POS - Manual (Page 215)

Troubleshooting
Chapter 10
10Ć3
The 1771-ES expander module has six indicators (Figure 10.2):
Module active - This green indicator is on when the 1771-ES expander
is operating normally.
Marker - This green indicator is on when the 1771-ES expander
detects the encoder marker signal. Note that this indicator turns on
only if the signal from encoder channels A and B are true when the
marker signal is true unless you set the marker-logic jumper for
ungated.
Home - This green indicator is on when the axis is at the home
position.
Tachometer calibrate (TACH CAL) - This green indicator is used in
setting up the loss-of-feedback detection feature (see section titled
“Tachometer Calibration,” chapter 9).
Hardware stop (HDW STOP) - This red indicator goes on when the
hardware stop input is on. It stays on until the 1771-ES expander is
reset.
Diagnostic (DIAG) - This red indicator goes on when the 1771-ES
expander detects a module fault.
At power up, the module active, marker, home, hardware stop, and
diagnostic indicators all flash on then off. They stay off while the module
performs power-up diagnostics. If diagnostics detect no problem, the
active indicator turns on.
Figure 10.2
1771ĆES Expander Indicators
SERVO
EXPANDER
(ENCODER)
SERVO
EXPANDER
(ENCODER)
Module Active (Green)
Marker (Green)
Home (Green)
Tach Calibration (Green)
Hardware Stop (Red)
Diagnostic (Red)
Monitoring 1771ĆES Expander
Indicators