Siemens Sinumerik 840D sl Function Manual page 393

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36923
MD number
Default value: 0.0
Change becomes effective after: POWER ON
Data type: DOUBLE
Meaning:
corresponds with ...
36924
MD number
Default value: 16,2,16,16
Change becomes effective after: POWER ON
Data type: DWORD
Meaning:
corresponds with ...
36925
MD number
Default value: 1
Change becomes effective after: POWER ON
Data type: DWORD
Meaning:
corresponds with ...
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
$MA_SAFE_INFO_ENC_RESOL[0...7]
Safety- -relevant encoder resolution
Min. input limit: - -
Protection level: 7/- -
Display data
Resolution of the encoder being used in the particular gear stage for the Safety Integrated
monitoring functions. With this accuracy, for a single- -encoder system, safety- -related posi-
tions can be monitored. If different encoders are used for the Safety Integrated monitoring
functions in the drive and in the NCK, then this MD is 0.
$MA_SAFE_ENC_NUM_BITS[0...3]
Bit information of the redundant actual value
Min. input limit: - -16
Protection level: 7/- -
Information about the redundant actual value:
- - Field index 0: Number of valid bits of the redundant actual value
- - field index 1: Number of bits of the fine resolution of the redundant actual value
- - field index 2: Number of relevant bits of the redundant actual value
- - field index 3: Most significant bit of the redundant coarse position
This information is read- -out when booting (for DRIVE- -CLiQ encoders, from the drive para-
meters r0470, r0471, r0472 and r0475, for SMI/SMC/SME encoders, the default values
apply) and compared with the values that were last saved here. This MD is then over-
written. Alarm 27035 or 27036 is output if they are not equal.
If the combination of some values is incorrect, or if the number of relevant bits (index 2) is
equal to 0, then Alarm 27038 is output.
The values from MD36924 $MA_SAFE_ENC_NUM_BITS[0,1] are incorporated in the
calculation of MD36998 $MA_SAFE_ACT_CHECKSUM[1]. The values from MD36924
$MA_SAFE_ENC_NUM_BITS[2,3] are incorporated in the calculation of MD36998
$MA_SAFE_ACT_CHECKSUM[0].
If the combination of some values is incorrect, or if the number of relevant bits (index 2) is
equal to 0, then Alarm 27038 is output.
$MA_SAFE_ENC_POLARITY
Direction reversal actual value
Min. input limit: - -1
Protection level: 7/2
Using this data, the direction of the actual value can be reversed.
= - -1: Direction reversal
= 0: no direction reversal or
= 1: no direction reversal
8.1 Machine data for SINUMERIK 840D sl
Max. input limit: - -
Max. input limit: 32
Max. input limit: 1
Data Description
Unit: mm, degrees
Unit: - -
Unit: - -
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