Figure 2: Profisafe Layer Model - WAGO 750-666/000-003 Manual

WAGO-I/O-SYSTEM 750
750-666/000-003 4FDI/2FDO 24V/10A PROFIsafe V2 iPar
Data is exchanged between the secure PROFIsafe I/O modules and the safe PLC
via PROFIBUS or PROFINET as the physical basis. Data is exchanged in the
form of PROFIsafe telegrams that correspond to the PROFIsafe protocol profile
IEC 61784-3-3.

Figure 2: PROFIsafe layer model

The PROFIsafe telegrams are transferred between the safe PLC and PROFIsafe
module via the so-called "black channel". The "black channel" extends from the
PROFIBUS or PROFINET connection of the PLC via the fieldbus
coupler/controller, the internal bus in the node to the I/O module. The PROFIsafe
telegrams are only evaluated in the safe PLC and in the PROFIsafe module.
When detecting communication errors, the PROFIsafe I/O modules are passivated
in that all secure outputs are switched off and the "0" is transferred to the safe
PLC as an input process image.
Evaluation of the input process image and output of the output process image via
the PROFIsafe I/O modules with digital outputs are controlled by the safe PLC.
Note the following guidelines and information when setting up PROFIsafe
applications:
• Guideline PROFIsafe - Requirements for Installation, Immunity and electrical
Safety (PROFsafe Environental Requirements, current version)
• Installation recommendations (Handbook PROFIBUS Installation Guideline,
current version)
These documents are available on the Internet at
Manual
Version 1.2.0, valid from HW/SW Version 01/01
PROFIsafe
http://www.profibus.com/
17
.