Siemens Sinumerik 840D sl Function Manual page 546

Data Description
8.7 System variables
Bit 14: 1 = sign--of--life monitoring (LifeSign)
Bit 15: 1 = Asynchronous fault state (StateFault)
System variable $A_FRDP_SUBS
Substitute values that are output to the SPL in the following states are entered
using the system variable:
-- start of cyclic communication
-- communication error
Changes to the substitute values always become effective in the next F_DP clock
cycle, even during a fault situation.
Default value: After the control boots, initially, the values saved in MD
$MN_SAFE_RDP_SUBS become active.
System variable $A_FRDP_ERR_REAC
The response when a communication error occurs is set using the system variable.
Depending on the actual interdependently of the two plant/system components
involved, the response to a communication error, caused by a communication path
error or by consciously switching off one the plant/system components can be
specifically entered.
0 = Alarm 27350 + Stop D/E
1 = Alarm 27350
2 = Alarm 27351 (only display, self--clearing)
3 = No system reaction
Note
The user interface is set in all cases:
$A_FRDP_ERROR = 1
$A_FRDP_SUBS_ON = 1
$A_FRDP_DIAG corresponding to the detected communication error
SPL inputs $A_INSE correspondingly to $A_FRDP_SUBS
Whether initiated as fault response Stop D or Stop E, can be parameterized using:
NCK: $MN_SAFE_SPL_STOP_MODE
PLC: DB18.DBX36.1
Default value: After the control boots, initially, the values saved in MD
$MN_SAFE_SDP_ERR_REAC become active.
System variable $A_FRDP_ERROR
The system variable is used to indicate that there is a communication error. The
error cause determined by F_RECVDP is contained in the diagnostics data
$A_FRDP_DIAG.
0 = Normal mode
1 = Communication error
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
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