Siemens SINUMERIK 840D Description Of Functions page 222

4 Data Descriptions
4.1 Machine data
36936 $MA_SAFE_CAM_POS_PLUS[n]
MD number Plus cam position for safe cams
Default: 10 mm
Change becomes effective after POWER ON:
Data type: DOUBLE
Meaning The plus cam position for safe cams SN1 +, SN2 +,
SN3 + and SN4 + is specified in this data.
If the actual position is ≤ the value set here when the safe cam function is active, then the
appropriate safety-relevant output signal (SGA) is set to 0 and to 1 if the actual position is
> this value. (Observe the hysteresis for cam synchronization)
n = 0, 1, 2, 3 stands for plus cam position of SN1+, SN2+, SN3+, SN4+
Corresponds with ...
MD 36988: $MA_SAFE_CAM_PLUS_OUTPUT[n]
MD 36901: $MA_SAFE_FUNCTION_ENABLE
36937 $MA_SAFE_CAM_POS_MINUS[n]
MD number Minus cam position for safe cams
Default: -10 mm
Change becomes effective after POWER ON:
Data type: DOUBLE
Meaning The minus cam position for safe cams SN1-, SN2-, SN3- and SN4-.
If the actual position is ≤ the value set here when the safe cam function is active, then the
appropriate safety-relevant output signal (SGA) is set to 0 and to 1 if the actual position is
> this value. (Observe the hysteresis for cam synchronization)
n = 0, 1, 2, 3 stands for minus cam position of SN1-, SN2-, SN3-, SN4-
Corresponds with ...
MD 36989: $MA_SAFE_CAM_MINUS_OUTPUT[n]
MD 36901: $MA_SAFE_FUNCTION_ENABLE
36940 $MA_SAFE_CAM_TOL
MD number Tolerance for safe cams
Default: 0.1 mm
Change becomes effective after POWER ON:
Data type: DOUBLE
Meaning Due to the different mounting locations of the encoders and variations in clock cycle and
signal transit times, the cam signals of the two monitoring channels never switch at
exactly the same position and never simultaneously.
This data specifies the tolerance for all cams as a load-side distance. The monitoring
channels may have different signal states for the same cam within this tolerance band
without generating Alarm 27001.
Special cases, errors Recommendation:
Enter an identical or slightly higher value than that set in MD 36942.
36942 $MA_SAFE_POS_TOL
MD number Actual value comparison tolerance (crosswise)
Default: 0.1 mm
Change becomes effective after POWER ON:
Data type: DOUBLE
Meaning Due to the fact that encoders are not mounted in identical locations and the effects of
backlash, torsion, leadscrew errors, etc., the actual positions sensed simultaneously by
the NCK and drive may differ.
The tolerance band for the crosswise comparison of the actual position in the two
monitoring channels is specified in this data.
•
Special cases, errors
•
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SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
Min. input value: -2 147 000
Protection level (R/W) 7/2
Applies from SW 3.4
Min. input value: -2 147 000
Protection level (R/W) 7/2
Applies from SW 3.4
Min. input value: 0.001
Protection level (R/W) 7/2
Applies from SW 3.4
Min. input value: 0.001
Protection level (R/W) 7/2
Applies from SW 3.4
"Finger protection" (about 10 mm) is the primary consideration when setting this
tolerance value.
Stop response STOP F is activated when the tolerance band is violated.
Max. input value: 2 147 000
Unit: mm, inches, degrees
Max. input value: 2 147 000
Unit: mm, inches, degrees
Max. input value: 10 mm
Unit: mm, inches, degrees
Max. input value:
10 mm or 360 degrees
Unit: mm, inches, degrees
© Siemens AG 2003 All Rights Reserved
11.03
840D
840D
840D
840D