Siemens SINUMERIK 840D sl Function Manual page 92

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2.1 Axis monitoring

If using external zero marks (BERO) instead of encoder zero marks, you must deactivate

zero-mark monitoring:

MD36310 $MA_ENC_ZERO_MONITORING = 0

If zero-mark monitoring is tripped in the active measuring system, alarm 25020 appears:

"Axis <Axis identifier> Zero-mark monitoring of active encoder"

The affected axis is stopped via the configured braking ramp in follow-up mode:

MD36610 $MA_AX_EMERGENCY_STOP_TIME

(Maximum time for braking ramp when an error occurs)

If zero-mark monitoring is tripped in the passive measuring system alarm 25021 appears:

"Axis <Axis identifier> Zero-mark monitoring of passive encoder"

There is no further alarm response.

Zero-mark monitoring for absolute encoders

Absolute encoders use the absolute values supplied by the measuring system to check the

plausibility of the actual value.

During the check, the NC compares the cyclic position value held in the position control cycle

clock based on the incremental information from the encoder with a new position value

generated directly from the absolute and incremental information and checks that the

calculated position difference does not exceed the configured permissible deviation.

MD36310 $MA_ENC_ZERO_MONITORING

The permissible deviation is indicated in 1/2 rough lines. It is generally sufficient to enter a

1/2 rough line.

The "zero-mark monitoring" of absolute encoders specifically detects all deviations caused

by dirt on the absolute track or by faults when transferring the absolute value. However,

small errors in the incremental track (burst interference, impulse errors) are not detected. In

such instances the zero-mark monitoring only responds to deviations in the millimeter range.

This form of monitoring should therefore serve as additional monitoring to assist the

diagnosis of absolute-position faults.

Basic logic functions: Axis monitoring, protection zones (A3)

Function Manual, 11/2006, 6FC5397-0BP10-2BA0

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