Boundary Conditions - Siemens Sinumerik 840D sl Function Manual

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The synchronization of the SPL output data described above ensures that if it is

intended to simultaneously change several SPL output data in the SPL program,

then these are also consistently transferred (in time) in the F net data telegram of

the F_SENDDP. If, in a user application, several SPL output data are interpreted

as a contiguous bit pattern, it must therefore be taken into account that inter-

mediate values can briefly occur.

Three SPL output data are considered to be contiguous. The value is changed

from 101 to 110 in both SPL programs (NCK--SPL and PLC--SPL).

Values transferred from the F_SENDDP in the F net data telegram:

Output value

Possible intermediate values

Due to runtime differences in the NCK--SPL and PLC--SPL, it cannot be

guaranteed that these are sent consistently (in time) by F_SENDDP in the F net

data telegram when several SPL output data are simultaneously changed (NCK:

$A_OUTSE, PLC: $A_OUTSEP).

Boundary conditions

For SINUMERIK 840D sl, the following restrictions apply for the safety--related

CPU--CPU communication to couple plants and systems:

S The 2 integer values, defined in the F net data area of the F telegram, are not

used or not evaluated by the F_SENDDP and F_RECVDP realized for

S Axis specific SGE/SGA cannot be directly coupled to F_SENDDP and

S A maximum of 250 ms can be set for the F_DP clock cycle.

S The F net data are automatically coupled to the SPL interface in data block DB

18 by the basic PLC program. It is not possible to couple them in a PLC user

SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition

7.4 Safety- -related CPU- -CPU communication (F_DP communication)

Connecting Sensors/Actuators

= F net data telegram

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