Shared Device; Example Of Configuration And Programming - Siemens S7-300 Configuration Manual

Watchdog
PNIO_SEND and PNIO_RECV each have their own watchdog. Depending on the average
CPU cycle time, the connection to the PROFINET IO controller is terminated if one of the two
program blocks is no longer called following the initialization phase.
7.5

Shared device

Configuration of submodules with the "shared device" functionality
The "shared device" functionality allows submodules of one IO device to be distributed
among different I/O controllers to save one or more interface modules.
The access to the submodules of the shared device is distributed among the individual I/O
controllers. Each submodule of the shared device can also be assigned exclusively to one IO
controller. The assignment of the individual submodules is made in the configuration.
The function can be configured as of firmware version 3.0 of the S7-300 CPs, as of CPU
version 5.3 and only in STEP 7 V5.5.
You will find detailed information on the requirements and constraints of using and
configuring shared devices in the manual "PROFINET System Description", see references
/20/ (Page 233).
7.6

Example of configuration and programming

You access the configured input/output modules with program blocks in the user program of
the I-device. The program blocks make the process data pre-processed in the user program
of the I-device available on the interface to the PROFINET IO controller (PNIO_SEND) or
fetch the data transferred by the PROFINET IO controller for further processing in the user
program of the PROFINET IO device (PNIO_RECV).
The following example shows the configuration in HW Config and excerpts from the user
program of the CPU.
Configured I addresses and Q addresses on the PROFINET IO controller (STEP 7 V5.5)
The figure shows the CP configured in the PROFINET IO system as a PROFINET IO device
with 3 modules for process inputs and 3 for process outputs.
Configuring and commissioning S7 CPs for Industrial Ethernet
Configuration Manual, 09/2013, C79000-G8976-C182-13
Intelligent PROFINET IO device with S7-300 CP
7.5 Shared device
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