Configuring Joint Isochronous Operation Of Central And Distributed I/O - Siemens SIMATIC S7-1500 Function Manual

Configuring isochronous mode

5.3 Configuring joint isochronous operation of central and distributed I/O

5.3 Configuring joint isochronous operation of central and distributed I/O
Introduction
You can jointly operate central I/O in S7-1500 and distributed I/O on PROFINET IO
isochronously.
For the coordination and synchronization of the processing cycles of the central and
distributed I/O, you set the same send clock and isochronous mode interrupt OB in STEP 7.
The system clock results from the values for the central and distributed configurations.
Foremost here is the PROFINET send clock to which the central configuration is
synchronized. If necessary, you must set a higher send clock for PROFINET IO, which takes
the overall system into account.
Setting the same send clock for central and distributed I/O
You want to operate modules configured as central I/O in S7-1500 and modules configured
as distributed I/O in ET 200MP isochronously with the same send clock.
Requirements
● You have connected distributed I/O in an ET 200MP as isochronous I/O to PROFINET IO
(see section Configuring isochronous mode for distributed I/O on PROFINET IO
(Page 24)).
● The IO controller is an S7-1500 CPU.
● You have connected central I/O of the S7-1500 as isochronous I/O (see section
Configuring isochronous mode for central I/O in S7-1500 (Page 26)).
● You have configured the same isochronous mode interrupt OB and the same process
image partition for central and distributed I/O.
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Isochronous mode
Function Manual, 10/2018, A5E43884988-AA