Siemens Sinumerik 840D sl Function Manual page 282

Connecting Sensors/Actuators
7.4 Safety- -related CPU- -CPU communication (F_DP communication)
S Discrepancies in the output data (OutputdataDiscrepancy)
The F_DP drivers indicate their particular state using various output data. At the
end of each F_DP clock cycle, the NCK and PLC status data are compared and
they must match.
=> Alarm 27355
The following output data are compared:
F_SENDDP (NCK)
-- $A_FSDP_ERROR[1...n]
-- $A_FSDP_SUBS_ON[1...n]
F_SENDDP (PLC)
-- FSDP[1..3] or FSDP_HF[4..16].ERROR
-- FSDP[1..3] or FSDP_HF[4..16].SUBS_ON
F_RECVDP(NCK)
-- $A_FRDP_ERROR[1...n]
-- $A_FRDP_SUBS_ON[1...n]
-- $A_FRDP_ACK_REQ[1...n]
-- $A_FRDP_SENDMODE[1...n]
F_RECVDP(PLC)
-- FRDP[1..3] or FRDP_HF[4..16].ERROR
-- FRDP[1..3] or FRDP_HF[4..16].SUBS_ON
-- FRDP[1..3] or FRDP_HF[4..16].ACK_REQ
-- FRDP[1..3] or FRDP_HF[4..16].SENDMODE
F_DP communication--specific system error
S The SPL input/output data are not updated (SPL I/O--communication)
Data exchange between the SPL and the F_DP drivers is interrupted.
=> Alarm 27355
S No longer any communications between the NCK and PLC
The PLC was not able to process the OB40 request for F_DP communication
within the maximum monitoring time of 500 ms.
=> Alarm 27355
Depending on the particular error, the cyclic processing of the F_DP driver (driver--
specific system error) or the complete F_DP communication (F_DP communica-
tion--specific system error) is stopped and the relevant alarm is displayed. With the
alarm, the NC start is locked and Stop D/E initiated.
Behavior regarding SPL:
Stopped F_RECVDP drivers output fail--safe values (0) as F net data towards the
SPL.
Behavior regarding communication partners:
Stopped F_DP drivers no longer generate any F telegrams. At the latest after the
configured timeout time, the communication partners detect the F_DP communica-
tion failure and go into the safe state corresponding to the specified profile.
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
© Siemens AG 2015 All Rights Reserved
10/15