Siemens SINUMERIK 828D Function Manual page 1243

Table 15-1 Properties of incremental and absolute encoders
Feature
Internal encoder position
Traversing range extension
Reference point offset
Supported referencing types
Adjustment status
Absolute position modulo range
Encoder Serial No.
Transfer of series startup files
Cam activation time
Nullmarke
Zero mark monitoring
Position after POWER ON without
actual value buffering
Position after POWER ON with
actual value buffering
Referenced after POWER ON
Requirement
The function can be used only with rotary absolute encoders:
• MD31000 $MA_ENC_IS_LINEAR = 0
• MD30240 $MA_ENC_TYPE = 4
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Incremental encoder
Value is updated only in MD34210 ≥ 1
MD30270 $MA_ENC_ABS_BUFFERING
No effect
MD34090 $MA_REFP_MOVE_DIST_CORR
Value input allowed
MD34200 $MA_ENC_REFP_MODE
= 1, 2, 3, 4, 5, 6, 7
MD34210 $MA_ENC_REFP_STATE = 0, 1, 2
Automatic encoder misalignment during
shut down while in motion.
MD34220 $MA_ENC_ABS_TURNS_MODULO
= 0
MD34230 $MA_ENC_SERIAL_NUMBER
= 0
Without any restrictions.
0 seconds
1 per encoder revolution
Hardware
0.0
MD34210 = 0
Last standstill position before
deactivation.
MD34210 = 1
15.9 Referencing with absolute value encoders
Absolute encoders
MD30250 $MA_ACT_POS_ABS
Value is updated only in MD30270 = 0
= 0 (default): Active
Value is updated exclusively via control
= 0, 1, 2
Automatic encoder misalignment during
parameter set change with position jump or
during serial number change.
= 1 - 4096
The value must be updated from the PLC
during each encoder change, otherwise loss
of adjustment plus alarm.
Due to encoder properties
MD30250, MD30270, MD34090, MD34210,
MD34220, MD34230
only possible with limitations.
several seconds
none
Software
Last position within MD34220.
MD30270 = 1
Last position including small movements
during POWER OFF.
MD30270 = 0
depends on adjustment status
R1: Reference point approach
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