Siemens Sinumerik 840D sl Function Manual page 268

Connecting Sensors/Actuators
7.4 Safety- -related CPU- -CPU communication (F_DP communication)
System variable: Substitute value signal, $A_FRDP_SUBS_ON
System variable $A_FRDP_SUBS_ON[1...n] is used to signal that the substitute
values, specified using the system variable $A_FRDP_SUBS[1...n] should be
output to the SPL inputs $A_INSE[1...n].
System variable $A_FRDP_SUBS_ON[1...n] is cyclically compared with the
corresponding PLC variables FRDP[1...n].SUBS_ON. If unequal, there is a system
error and this is displayed using Alarm 27355 "F_DP: %1 communication, connec-
tion %2 reports a system error %3 (%4)".
System variable: Request signal for user acknowledgment,
$A_FRDP_ACK_REQ
System variable $A_FRDP_ACK_REQ[1...n] is used to signal that after a commu-
nication error, cyclic F telegrams are again being exchanged, but in order to
acknowledge the error and to output the process values, a user acknowledgment is
still required via the interface signal DB18.FRDP_ACK_REI or Channel_1 reset.
System variable $A_FRDP_ACK_REQ[1...n] is cyclically compared with the cor-
responding PLC variables FRDP[1...n].ACK_REQ. If unequal, there is a system
error and this is displayed using Alarm 27355 "F_DP: %1 communication, connec-
tion %2 reports a system error %3 (%4)".
System variable: Diagnostics data, $A_FRDP_DIAG
System variable $A_FRDP_DIAG[1...n] is used to signal the cause of the commu-
nication error determined by F_RECVDP.
System variable $A_FRDP_DIAG[1...n] is not cyclically compared with the corre-
sponding PLC variable FRDP[1...n].DIAG.
System variable: Safety operation, $A_FRDP_SENDMODE
System variable $A_FRDP_SENDMODE[1...n] displays the actual operating mode
of the F--CPU of the sender (F_SENDDP). If the F--CPU is in the deactivated
safety mode, then this is signaled to the receiver in the F telegram. The receiver
then sets $A_FRDP_SENDMODE[1...n] = 1.
For SINUMERIK 840D sl, the deactivated safety mode corresponds to the
SPL--commissioning mode ($MN_PREVENT_SYNACT_LOCK = 0 or
DB18DBX36.0 = 0).
System variable $A_FRDP_SENDMODE[1...n] is cyclically compared with the cor-
responding PLC variables FRDP[1...n].SENDMODE. If unequal, there is a system
error and this is displayed using Alarm 27355 "F_DP: %1 communication, connec-
tion %2 reports a system error %3 (%4)".
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
© Siemens AG 2015 All Rights Reserved
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