Siemens SINUMERIK 840D sl Function Manual page 358

Data descriptions
9.1 Machine data for SINUMERIK 840D sl
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:
Special cases, errors,...
corresponds with ...
Additional reference
36925
MD number
Default value: 1
Change becomes effective after: POWER ON
Data type: DWORD
358
$MA_SAFE_INFO_ENC_RESOL[0...7]
Safety-relevant encoder resolution
Min. input limit: -
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 positions
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
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
Array index 2: Number of relevant bits of the redundant actual value
Array index 3: Most significant bit of the redundant coarse position
This information is read-out when booting (for DRIVE-CLiQ encoder, from the drive parame‐
ters 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 overwritten. 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 calcu‐
lation 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/-
Protection level: 7/-
Protection level: 7/2
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Max. input limit: -
Unit: mm, degrees
Max. input limit:32
Unit: -
Max. input limit: 1
Unit: -
Safety Integrated