Communication Error When The Control Boots Before Spl; Processing Starts - Siemens Sinumerik 840D sl Function Manual

Connecting Sensors/Actuators
7.4 Safety- -related CPU- -CPU communication (F_DP communication)
S F_RECVDP (PLC)
-- FRDP[1...3] or FRDP_HF[4..16]
-- .ERROR = FALSE
-- .SUBS_ON = FALSE
-- .ACK_REQ = FALSE
-- .SENDMODE = X (value corresponding to the received F telegram)
-- .DIAG = 0
-- .RETVAL14 = 0
-- RETVAL15 = 0
Note
If a DP slave is switched off using F_SENDDP / F_RECVDP with communication
active, then among other things, the PLC signals the Alarms 400551/400552
"MPI/DP bus error". The alarms are not issued if, before the DP slave is switched
off, this is specifically deactivated by calling SFC12 [D_ACT_DP].
7.4.10

Communication error when the control boots before SPL

processing starts

When booting, the user interface (DB18) is initialized with the boot substitute
values and the boot error response from the NCK machine data. The values are
valid and are effective for communication error as long as they are not overwritten
with values from the SPL.
Initializing when booting:
FRDP[1...3] or FSDP_HF[4..16].ERR_REAC = $MN_SAFE_SDP_ERR_REAC
FRDP[1...3] or FRDP_HF[4..16].SUBS[0..15] = $MN_SAFE_RDP_SUBS
FRDP[1...3] or FRDP_HF[4..16].ERR_REAC = $MN_SAFE_RDP_ERR_REAC
7.4.11 Acknowledging a communication error with channel_1 reset
If, due to a communication error, an alarm with NCK responses and possibly a
STOP D/E initiated, then the user acknowledgment must be realized using a
channel_1 reset in order that the alarms are cleared and the alarm responses
reset. If the channel_1 reset is initiated before setting the request for the user
acknowledgment $A_FRDP_ACK_REQ, then the NCK responses are reset within
the scope of the reset processing. As a result of the communication error that is
still present, the alarm is again initiated in the next F_DP clock cycle and the NCK
responses are reactivated.
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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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