Siemens SINUMERIK 840D sl Function Manual page 201

05.08
PROFIsafe communication
The principle of PROFIsafe communications between SINUMERIK 840D and the F
modules on the PROFIBUS–DP is explained in detail below. This is based on the
transfer of the SPL output data $A_OUTSE/$A_OUTSEP to the F–DO modules:
The PROFIsafe layer creates a PROFIsafe telegram (F telegram) in each PROFI-
safe cycle with the ANDed SPL output data as F useful (net) data
and the backup data (CRC and the consecutive number) and transfers it to the
PROFIBUS layer via the DP data interface.
The PROFIBUS layer transfers a DP telegram with the PROFIsafe telegram
created by the F layer in each PROFIBUS cycle as DP useful data to the DP
slaves. This is independent of the PROFIsafe cycle.
Warning
!
It is not guaranteed that simultaneous changes to individual bits in the SPL (NCK
and PLC OUTSE), which are interpreted as a contiguous associated bit pattern,
are transferred together. It is possible that the receiver briefly receives an
inconsistent bit pattern.
Configuring/parameterizing
The configuration and parameterization needed to connect the F modules to the
external NCK/PLC–SPL interfaces entails the following steps:
1. Generating the configuration using SIMATIC STEP7.
2. Performing a standard SINUMERIK 840D sl commissioning (minimum require-
ment).
3. Loading the configuration and the PLC basic and user program modules into
the SINUMERIK 840D sl PLC.
4. Parameterizing the PROFIsafe–relevant SINUMERIK 840D sl machine data.
See Chapter 7.2.4 "Parameterizing the F master (NCK)".
© Siemens AG 2008 All Rights Reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition
F useful (net) data = (OUTSEP AND $A_OUTSE)
Connecting Sensors/Actuators
7.2 Connecting I/O via PROFIsafe
7-201