Functional Limitations - Siemens SINUMERIK 840D sl Function Manual

03.06
7.2.10

Functional limitations

When connecting via SPL I/O using one safety-relevant bus (PROFIsafe), several
secondary conditions and constraints must be taken into consideration when con-
figuring and programming:
S Faults/errors in the PROFIsafe input devices (e.g. input signals that differ from
one another) cause the associated SPL input signals ($A_INSE(P)) to be de-
leted (cleared). This initiates a STOP D/E.
S The external SPL input signals in the DB18 interface for the $A_INSEP vari-
ables are transferred within the system. This means that programming is no
longer necessary in the user program. Only one signal state for both SPL chan-
nels is transferred to the master from the PROFIsafe input peripherals.
S The external SPL output signals of the DB18 interface ($A_OUTSEP variables)
are transferred within the system to the relevant PROFIsafe output modules. A
signal state is transferred to the output modules via PROFIsafe.
S It may be necessary to use single-channel signals (signals that are present only
in the PLC or only in the NCK) to change over external SPL outputs (e.g. bra-
king control). These single-channel signals must also be made available to the
other program channel to align the logic and program synchronously. Direct
communications between the NCK and PLC-SPL via DB18 is a good way to
achieve this.
S In each PROFIsafe cycle, the PROFIsafe layer generates a PROFIsafe tele-
gram with the logically AND'ed SPL output data as F net (useful) data.
F modules
As far as the F modules that can be operated with a SINUMERIK 840D sl, the fol-
lowing limitations apply:
S F modules with dynamic i parameters are not supported.
S The maximum possible F net data width for each F module is 64 bits.
S The value range for the F address of an F module is as follows: 1 – 65535
1 – FFFF
Axial SGE/SGA
I/O (F net data) of an F module cannot be connected to axial 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.
© Siemens AG, 2006. All rights reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 03.2006 Edition
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Connecting Sensors/Actuators
7.2 Connecting I/O via PROFIsafe
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