Response Times - Siemens Sinumerik 840D sl Function Manual

Connecting Sensors/Actuators
7.2 Connecting I/O via PROFIsafe
//external SPL output bytes (HW) with PROFIsafe slaves
OUTSEP_PROFISAFE:
:
END_STRUCT;
7.2.10

Response times

The response times listed here refer exclusively to the internal processing of the
signals by the F master. The following apply:
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 moni-
tor 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 milli-
seconds.
S The specified maximum times are theoretical values; it is extremely improbable
that they actually occur in practice.
Reason:
-- It is improbable that the run time of the PLC--F driver is delayed -- in the
OB40 context -- by the maximum time of 50 ms. The reason for this is that
the interrupting organizational blocks (OB8x) only have such long run times
in extremely few cases.
7-228
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
ARRAY[1 ... 8] OF BOOL;
© Siemens AG 2015 All Rights Reserved
10/15