Siemens SINUMERIK 840D Description Of Functions

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
8-459
The levels of the SN signals change as follows:
SN1+
SN1-
359.5° 0° 0.5°
Modulo
correction
Position detection
to be implemented
SN1-
Position detection
0 degrees
SN1+
&
Fig. 8-9 Signal generation for modulo cam 1
Because of the modulo correction and the associated level changes of the safe
cams, the above method of rounding would have the effect that "position
detection 0 degrees” would always be a low signal.
This problem can be solved by negating signal SN1+ in the machine data
parameterization and OR'ing it with signal SN1-.

Siemens SINUMERIK 840D Specifications

General

Series	SINUMERIK 840D
Axes	Up to 31
Channels	Up to 10
Operating System	Windows-based
Power Supply	24 V DC
Control Unit Type	CNC
Interface	Ethernet, PROFIBUS
Display	TFT color display
Interpolation	Spline
PLC	Integrated PLC
Data Storage	CompactFlash, USB