Siemens SINUMERIK 840D Description Of Functions page 196

3 Safety-Related Functions
3.12 SI I/Os using fail-safe modules connected to PROFIBUS DP (840D from SW 6.3.30)
3.12.8 Response times
The response time considered here is the time between a signal changing at
the input of an F/DI module and the signal changing at the relevant output of an
F/DO module.
The NC response time T
NC response time
The PLC response time T
PLC response time
where:
3.12.9 Functional limitations
Mixed mode for I/O modules available for SINUMERIK 840D:
I/O modules
can be operated in parallel.
Multiple assignment of inputs of the various modules to the same SPL SGE are
detected and displayed in an alarm:
•
Axial NCK-SGE/SGA It is not possible to directly connect the I/Os (F useful data) of an F module to
axial NCK SGE/ SGAs. They can only be connected in the context of the NCK-
SPL which must be installed for the purpose.
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SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
R_NCK
T > T T = T
PST IPO: R_NCK
T = T T = T
PST IPO: R_NCK
Note
The NC response time is decisive when disabling (1 > 0) an output.
R_PLC
T = T + T
R_PLC INPUT OUTPUT
Note
The PLC response time is decisive when activating (0 > 1) an output.
T :
Processing/transfer times for F-DI module and DP slave
INPUT
T :
Processing/transfer times for F-DO module and DP slave
OUTPUT
T :
Internal transfer cycle of DP master, typically 2 ms
DPM
T :
Parameterized IPO cycle
IPO
T :
Parameterized PROFIsafe cycle
PST
T :
OB1 processing time
OB1
F modules
-
DMP modules
-
Onboard I/O
-
Alarm: 27204 "PROFIsafe: Dual allocation MD Number [ Index ] -
MD Number [ Index ]"
is approximated to:
+ T + 2* T
INPUT OUTPUT DPM
+ T + 2* T
INPUT OUTPUT DPM
is approximated to:
+ 4 ms + 1* T + 2* T
PST
© Siemens AG 2003 All Rights Reserved
11.03
+ 1*T + 3* T
IPO PST
+ 2*T
IPO
OB1