Rockwell Automation 1771-QC , D17716.5.25 SER/B SERVO POS - Manual (Page 91)

Formatting and Interpreting Data Blocks
Chapter 7
7Ć9
software stop command
hardware stop input open
excess following error
loss of feedback
loss of power
firmware or hardware watchdog timeout on the 1771-ES expander
Bit 11 Hardware Stop
The 1771-M3 controller turns on this bit only if the hardware stop input of
the 1771-ES expander is open. Note that the immediate stop bit (bit 10) is
also on if this bit is on. You can turn off this bit with a reset command or
by cycling power to the I/O chassis backplane.
Bit 12 Feed Reduction
This bit goes on when axis following error reaches 106.25% of rapid
traverse following error, resulting in 50% feedrate reduction, but has not
necessarily reached the excess error point. When axis following error
does reach the excess error point, the feed reduction bit stays on, and the
immediate stop status bit goes on.
Important: If the excess error point is less than 106.25% of rapid traverse
following error, immediate stop occurs before feed reduction.
Consequently, the feedrate reduction bit in the status block does not turn
on.
Bit 13, 14 + and Ć Travel Limits
These bits are on when the axis is at the corresponding software travel
limit positions. You enter the travel limits in the parameter block.
Bit 15 Insufficient Data
When the servo positioning assembly receives a command to execute axis
motion, such as start or begin, but does not have moveset data to execute a
move, it turns on the insufficient data bit. It also turns on this bit when
you issue an escape command, even though you had never stored an
escape move on the 1771-ES expander.
This insufficient data bit stays on until the 1771-M3 controller receives a
new moveset block and then a start or begin command.