Shared Device applications
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8 Shared Device applications
Multiple IO controllers are often used in larger or widely distributed plants. Without the “Shared Device
function”, each I/O module of an IO device (measuring system) would be assigned to the same IO
controller. This function enables the process data of the measuring system to be distributed to several
IO controllers without having to establish a time-consuming controller-2-controller communication.
The Shared Device function integrated into the measuring system makes it possible the configure
max. four safety-related modules with the same Module Ident Number and to distribute these to
four different IO controllers (F Hosts). Each module is assigned to its own slot; slots 1 and 4 to 6 are
provided for this purpose.
The configuration of the slots in this configuration is arbitrary, but all configured modules
must have the same iParameter settings for the measuring system to start.
Decisive for the calculation of F_iPar_CRC are the iParameters of the controller starting first.
F_iPar_CRC is calculated for this controller, which is then expected during startup for all other
configured modules. Provided it is identical, the measuring system will start, otherwise a diagnostic
alarm with error type 0072
d
is output, see Chapter “PROFINET Diagnose-Alarm” on Page 143.
All non-safety-related modules can only be assigned to a single controller. However, as two channels
are supported on different slots in TR mode as well as in PNO mode, these modules can be assigned
to different controllers as well.
Within a single application relationship (AR), one or more communication relationships (CR) can be
defined. Each communication relationship can in turn consist of several slots or subslots, see the
following configuration example (TR mode):
Figure 16: Shared Device, configuration example
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