Direct Communications Between Nck And Plc-Spl - Siemens SINUMERIK 840D sl Function Manual

03.06
LEVELSI
The signal LEVELSI is used for diagnostics and indicates how many signals with
different signal levels are present.
COMM_TO
If communications between the NCK and PLC are interrupted regarding SPL
crosswise data comparison, then after a delay of 5 s the PLC is switched into the
STOP state. Status signal DB18.DBB119, bit 5 is used to inform the SPL program-
mer that the 5 s timer was started. This means that it is possible to initiate system-
specific actions before the PLC goes into the stop condition.
SPL status signals for SPL_STATUS (DB18.DBB136)
For a detailed description, see Subsection 8.3.3 "PLC data bock (DB 18)".
INSEP_PROFISAFE (DB18.DBB138)
Bit array INSEP_PROFISAFE[1...8] is used to indicate which INSEP bytes are
only assigned to F modules.
0 = no PROFIsafe F modules are assigned to INSEP[1...8]
1 = PROFIsafe F module is transferred to INSEP[1...8] by the basic program
OUTSEP_PROFISAFE (DB18.DBB140)
Bit array OUTSEP_PROFISAFE[1...8] is used to display which OUTSEP bytes are
only assigned F modules.
0 = PROFIsafe F modules not assigned to OUTSEP[1...8]
1 = OUTSEP[1...8] transferred to PROFIsafe F module using the basic program
7.3.11

Direct communications between NCK and PLC-SPL

In SPL applications, a certain degree of single-channel communications between
the two SPLs (NCK and PLC) is always required in addition to safety-related swit-
ching elements being connected through two channels. Testing external stops and
the Emergency Stop acknowledgment are typical applications.
In order to be able to exchange single-channel SI-specific signals between the
NCK and PLC in a dedicated data area, a corresponding communication interface
exists between these components. The meaning of the individual bits in this inter-
face are defined by the user.
NCK
$A_PLCSIOUT[1...32]
$A_PLCSIIN[1...32]
© Siemens AG, 2006. All rights reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 03.2006 Edition
7.3 Safe programmable logic (SPL)
PLC
DB18.DBD128
DB18.DBD132
Connecting Sensors/Actuators
32 bits from the NCK to PLC
32 bits from the PLC to NCK
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