Rockwell Automation 1771-QC , D17716.5.25 SER/B SERVO POS - Manual (Page 161)

Formatting and Interpreting Data Blocks
Chapter 7
7Ć79
Here are some additional notes about illegal programming:
Even though the programming error bit in the status block is on, the
1771-M3 controller responds to the following commands and
information:
emergency stop
slide stop
reset
software travel limit override
tachometer calibrate
feedrate override value
jog rate select
If you issue a preset, new parameter, or initialize home command while
the axis is in motion, the status block indicates a programming error. If
the command is still present after axis motion stops, the 1771-M3
controller acknowledges it, and executes it.
The status block indicates a programming error if you change the servo
positioning assembly mode from auto to manual or from manual to auto
under either of the following conditions:
If you change the mode while an axis is in motion, the status block
indicates a programming error and the 1771-M3 controller
commands a slide stop. The programming error bit clears when
axis motion stops. If the mode change is still commanded after
axis motion stops, the mode changes.
If you attempt a mode change when any of bits 0 thru 4 of the first
axis control word or bit 12 of the second axis control word are on,
the 1771-M3 controller sets a programming error in the status
block for the axis. If the axis is in motion, a slide-stop is executed.
The mode change occurs only after bits 0 thru 4 of the first axis
control word and bit 12 of the second axis control word are off and
only the command for the mode change is still present.
In this chapter we told you what information to put into the parameter,
moveset, and command blocks to direct the servo positioning system. We
also told you how to monitor the servo positioning system thru the status
block.
Now you need to learn how to generate a ladder diagram program to
transfer these blocks of information between the data table and the servo
positioning system.
Summary