11.03 8 Application examples
8.4 Safe cams at the modulo limit
© Siemens AG 2003 All Rights Reserved
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
8-463
SN_Sync01_00.DSF
SN1+ (K1) + SAFE_CAM_TOL
SN1+ (K1-
channel 1
)
SAFE_CAM_TOL
Channel 1 (NCK) - unsync..
SN1+ (K2) + SAFE_CAM_TOL
SN1+ (K2 -
channel 2
)
SAFE_CAM_TOL
Channel 2 (drive) - unsync. .
Static deviation of actual values
&
SGA SN1+ synchronized
with hysteresis
Generation of an area cam from SN1+ and SN1- (PULSE)
SGA SN1+ synchronized with hysteresis
(negation of a signal for SN1+ via MD parameters)
SGA SN1- synchronized with hysteresis
(generated in same way as SN1+)
SAFE_CAM_TOL
SAFE_CAM_TOL
Use of cam signals (signal pattern depending on traversing direction)
(by mapping onto same signal HW/INSI)
Traversing
direction +
Traversing
direction -
Cam synchronization SN1+
SAFE_CAM_TOL
SAFE_CAM_TOL
SAFE_CAM_TOL
Fig. 8-12 Signal generation for modulo cam 2
As can be seen in the diagram, the setting of machine data
MD_SAFE_CAM_TOL determines the following variables:
•
Magnitude of the hysteresis (for a synchronized cam signal)
• Magnitude of the traversing direction-dependent offset of the pulse
generated from two cam signals
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