HEIDENHAIN TNC 430 PA/M - Encoder Monitoring

December 2001 Machine Axes 6 – 11
Encoder monitoring HEIDENHAIN contouring controls monitor the signal transmission from the
encoders. With machine parameters MP20.x and MP21.x, you activate the
monitoring function for the position encoders. The following criteria are
checked:
MP20 Monitoring functions for the axes
Format: %xxxxxxxxx
Input: Bits 0 to 8 correspond to axes 1 to 9
0: Monitoring not active
1: Monitoring active
MP20.0 Absolute position of distance-coded reference marks
MP20.1 Amplitude of encoder signals
MP20.2 Edge separation of encoder signals
MP21 Monitoring functions for the spindle
Format: %xx
Input: Bit 0 – Spindle 1
0: Monitoring not active
1: Monitoring active
Bit 1 – Spindle 2
0: Monitoring not active
1: Monitoring active
MP21. Has no function
Input: 0
MP21.1 Amplitude of encoder signals
MP21.2 Edge separation of encoder signals
Criterion Error message
Absolute position with distance-
coded reference marks
Encoder <AXIS> DEFECTIVE
Amplitude of encoder signals Encoder AMPLITUDE TOO LOW <AXIS>
Edge separation of encoder
signals
Encoder <AXIS>: FREQUENCY TOO HIGH
Note
Please note:
n For digital axes the speed encoders are always monitored.
n For more information on error messages from speed encoders, see
“Error Messages” section.