Functional Boundary Conditions - Siemens SINUMERIK 840D sl Function Manual

05.08
7.2.11

Functional boundary conditions

When connecting via SPL I/O using one safety–related 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.
braking 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
Note
Only ET 200 stations can be operated whose configuration is less than 244 bytes
large. If this rule is not observed, then PROFIsafe modules will no longer be
detected and Alarms 27220 and 27221 will be output. The size of the configuration
can be taken from the documentation of the ET 200 modules or using the ET 200
configurator.
© Siemens AG 2008 All Rights Reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition
H
Connecting Sensors/Actuators
7.2 Connecting I/O via PROFIsafe
or
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7-221