8 Application examples 11.03
8.4 Safe cams at the modulo limit
© Siemens AG 2003 All Rights Reserved
8-460 SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
SN1-
359.5° 0° 0.5°
Modulo
correction
SN1-
Position detection
0 degrees
1
≥
SN1+
SN1+
inverted
>1
Fig. 8-10 Signal generation for modulo cam 2
However, the OR operation is not integrated in the system and must be
implemented in the SPL or by hardwiring.
With SPL, the two cam signals are parameterized to $A_INSI variables and
logically combined in the SPL.
36988 SAFE_CAM_PLUS_OUTPUT[0] 84010101 ($A_INSI[1])
36989 SAFE_CAM_MINUS_OUTPUT[0] 04010102 ($A_INSI[2])
IDS=1 DO $A_MARKERSI[1] = $A_INSI[1] OR $A_INSI[2]
PLC programming is analogous to that of the NCK SPL.
UN DB3x.DBX109.0 // SN1+ inverted
= DB18.DBX62.0 // $A_INSIP[1]
//
U DB3x.DBX109.1 // SN1-
= DB18.DBX62.1 // $A_INSIP[2]
//
U DB18.DBX62.0 // $A_INSIP[1]
O DB18.DBX62.1 // $A_INSIP[2]
= DB18.DBX72.0 // Position detection 0 degrees
// $A_MARKERSIP[1]
Without SPL, the SN1+ cam is negated and parameterized to an output. The
SN1- cam is also parameterized to a separate output.
36988 SAFE_CAM_PLUS_OUTPUT[0 ] 81040101
36988 SAFE_CAM_MINUS_OUTPUT[0] 01040102
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