Siemens SINUMERIK 840D sl Function Manual page 2018

Detailed Description
2.1 Various interface signals and functions (A2)
DB19
DBX20.7
Switch over MCS/WCS
Edge evaluation: no
Signal state 1 or The coordinate system is switched over from workpiece coordinate system (WCS) to machine
edge change 0 → 1 coordinate system (MCS) or from MCS to WCS.
After it has been set, the signal is active for 1 PLC cycle.
Signal state 0 or No effect
edge change 1 → 0
Application The interface signal:
example(s) DB19, DBX20.7 (change over MCS/WCS)
must be transferred to the interface signal:
DB19, DBX0.7 (actual value in WCS)
in order that the changeover becomes effective.
Corresponding to .... DB19, DBX0.7 (actual value in WCS)
DB19
DBX22.0 - DBX22.7 displayed channel number from HMI
Edge evaluation: no
DB19
DBX24.0 Error (status RS-232-C from PLC)
Edge evaluation: no
Signal state 1 or Error status active
edge change 0 → 1
Signal state 0 or Error status inactive
edge change 1 → 0
Application The actual status of the RS 232 C is sent to the PLC in the acknowledgment byte DB19.DBB24.
example(s)
Corresponding to .... Applies to HMI Embedded
DB19
DBX24.1 O.K. (status RS-232-C from PLC)
Edge evaluation: no
Signal state 1 or O.K. status active
edge change 0 → 1
Signal state 0 or O.K. status inactive
edge change 1 → 0
Application The actual status of the RS 232C is sent to the PLC in acknowledgment byte DB19.DBB24.
example(s)
Corresponding to .... Applies to HMI Embedded
22
Signal(s) updated: cyclic
Signal(s) updated: cyclic
Signal(s) updated: cyclic
Signal(s) updated: cyclic
Basic logic functions: NC/PLC interface signals (Z1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0