Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 538)

Tool Tip Radius Compensation (TTRC)
Function
Chapter 21
21-54
Interference
This error occurs when compensation vectors intersect. Normally when
this intersection occurs, a backwards motion error is generated; however, a
few special cases exist that are caught only by interference error detection.
Figure 21.49
Typical Interference Error
Compensated path
Programmed path
Error is generated because
compensated vectors cross
Compensated path
necessary
to cut arc
r
r
r
12145-I
Disabling Error Detection
You can disable all of the above error detection (with the exception of
circular departure too small cases) for a specific block or portion of a part
program. To disable the error detection for a specific block, your system
installer must have defined an M-code in AMP. By programming this
M-code in a block, all error detection for TTRC can be disabled. Error
detection is disabled until another M-code defined in AMP to re-enable
error detection is programmed in a block.
Important: Circular departure too small cases cannot be disabled. The
control cannot execute a compensated path when this error occurs.
The default condition is error detection enabled. Default values for these
M-codes are:
M-code: Error detection:
M800 disables
M801 enables