Encoder Monitoring - HEIDENHAIN TNC 426 PB/M Technical Manual

Encoder monitoring

December 2001
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:
Criterion
Absolute position with distance-
coded reference marks
Amplitude of encoder signals
Edge separation of encoder
signals
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
Note
Please note:
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For digital axes the speed encoders are always monitored.
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For more information on error messages from speed encoders, see
"Error Messages" section.
Machine Axes
Error message
Encoder <AXIS> DEFECTIVE
Encoder AMPLITUDE TOO LOW <AXIS>
Encoder <AXIS>: FREQUENCY TOO HIGH
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