Response Times - Siemens SINUMERIK 840D sl Function Manual

Connecting Sensors/Actuators
7.2 Connecting I/O via PROFIsafe
Data block DB18 (excerpt):
STRUCT
:
SPL_DATA:STRUCT
INSEP:
OUTSEP:
:
//External SPL input bytes(HW) with PROFIsafe slaves
INSEP_PROFISAFE:
//External SPL output bytes(HW) with PROFIsafe slaves
OUTSEP_PROFISAFE:
:
END_STRUCT;
7.2.9

Response times

The response times listed here refer exclusively to the internal processing of the
signals by the F master. The means the following:
S T(FDI –> DB18) or T(FD I–> SPL-INSE)
The transfer time from the input area of the F-DI module to the input interface
of the PLC-SPL or NCK-SPL
S T(DB18 –> FDO) or T(SPL–OUTSE –> FDO)
The transfer time from the output interface of the PLC-SPL or NCK-SPL to the
output area of the F-DO module.
S T(FDI –> FDO)
Sum of the transfer times from:
– T(FDI –> DB18) or T(FDI –> SPL-INSE)
– Processing time by the user-specific SPL program.
– T(DB18 –> FDO) or T(SPL-OUTSE –> FDO)
The following applies for the subsequent tables of the PLC and NCK processing
times:
S Values in italics can increase by up to 50 ms due to delays in the communica-
tion path between the NCK and PLC.
S PST = 50 ms (PST = PROFIsafe clock cycle) is the permanently implemented
maximum time to detect error-free communications between the NCK and PLC.
A STOP response (STOP D/E) is initiated if this time is exceeded.
S OB1 = 150 ms is the maximum time set as standard in the PLC-CPU to monitor
the user level. The PLC goes into the STOP state if this time is exceeded.
S 0...m * IPO: This time component only becomes applicable if delays are in-
curred on the PLC side. In this case, in each subsequent IPO clock cycle, it is
determined as to whether the PLC is ready to communicate again.
S OB40_INT is the maximum permissible time to initiate the interrupt on the NCK
side up to execution of the PROFIsafe software and a ready signal to the NCK.
The time is mainly determined by the run time (propagation time) of the F driver
implementation on the PLC side and the PLC user program to be run-through in
the OB40 context. These times typically lie in the vicinity of a few milliseconds.
7-192
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 03.2006 Edition
ARRAY[1 ... 64] OF BOOL;
ARRAY[1 ... 64] OF BOOL;
ARRAY[1 ... 8] OF BOOL;
ARRAY[1 ... 8] OF BOOL;
© Siemens AG, 2006. All rights reserved
03.06