Profisafe Communication Behavior When System Errors Occur - Siemens Sinumerik 840D sl Function Manual

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Axis- -specific SGE/SGA
I/O (F net data) of an F module cannot be directly connected to axis--specific SGE/
SGA. They can only be connected in the context of the SPL that must be installed
for the purpose.
PLC SPL SGE/SGA
The basic PLC program automatically connects the I/O (F net data) of an F module
to the SPL interface in data block DB18.
It is not possible to connect them in a PLC user program.
7.2.13

PROFIsafe communication behavior when system errors occur

A system error relating to PROFIsafe communication exists, if the PROFIsafe
layer identifies erroneous behavior that is not as a result of a communication error
defined in the PROFIsafe protocol, but which can only be caused by incorrect be-
havior of the system software or hardware.
Driver--specific system errors:
S Asynchronous fault state (StateFault)
The NCK or PLC--PROFIsafe driver is in the fault state while the associated
PROFIsafe driver of the 2nd channel is not in a fault state.
=> Alarm 27257
PROFIsafe communication--specific system fault
S The SPL input/output data are not updated (SPL I/O--communication)
Data exchange between the SPL and the PROFIsafe drivers is interrupted.
=> Alarm 27257
S No longer any communications between the NCK and PLC
The PLC was not able to execute the OB40 request for PROFIsafe communica-
tion within the maximum monitoring time of 50 ms.
=> Alarm 27253
Depending on the particular error, the cyclic processing of the PROFIsafe driver
(driver--specific error) -- or the complete PROFIsafe communication (PROFIsafe
communication--specific system error) is stopped -- and Alarm 27257 "PROFIsafe:
%1 %2 signals system error %3 (%4)" is displayed. With the alarm, the NC start is
locked and Stop D/E initiated.
Behavior regarding SPL:
PROFIsafe drivers of type F--DI or F--DI/DO F modules that have stopped output
fail--safe values (0) as F net data in the direction of SPL.
Behavior regarding PROFIsafe slave:
Stopped PROFIsafe drivers no longer generate F telegrams. At the latest after the
configured timeout time, the F modules (PROFIsafe slaves) identify the failure of
the PROFIsafe communication and go into the safe state corresponding to the
specifications of the PROFIsafe profile.
© Siemens AG 2015 All Rights Reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
Connecting Sensors/Actuators
7.2 Connecting I/O via PROFIsafe
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