Siemens SIMATIC S7-1500 System Manual page 104

In STEP 7 you configure an IO device connected via the "Switched S1 device" function by
assigning a standard IO device to both CPUs of the redundant S7-1500R/H system.
Note
Standard IO devices in the redundant system S7-1500R
Standard IO devices usually do not support H-Sync forwarding.
To avoid a cycle time increase when the PROFINET ring is interrupted, integrate the standard
IO devices (without H-Sync forwarding) downstream of a switch and not in the PROFINET
ring.
Note
I-device as standard IO device
You cannot assign a device that you configured in STEP 7 as an I-device to the S7-1500R/H
redundant system.
In order to operate an I-device as a standard IO device on the S7-1500R/H redundant system,
always configure the I-device via GSD file.
• SIMATIC CPU as I-device
– First, configure the SIMATIC CPU in STEP 7 as an I-device with all transfer areas.
– Export the I-device as a GSD file. The GSD export can be found in the properties of the
– Install the GSD file in STEP 7.
• HMI device as I-device ("Direct key" function)
– The GSD files for SIMATIC Comfort Panel and SIMATIC Mobile Panel can be found in this
Assign the device configured via GSD file to the S7-1500R/H redundant system.
As of FW version V2.9, you can influence the changeover time between disconnection and
return of switched S1 devices after a failure/STOP of the primary CPU. You can find more
information in the PROFINET Function Manual
(https://support.industry.siemens.com/cs/ww/en/view/49948856).
MRP interconnection
The MRP interconnection process is an enhancement of MRP and allows the redundant
coupling of two or more rings with MRP in PROFINET networks. MRP interconnection is - like
MRP - specified in the standard IEC 62439-2 (Edition 3).
MRP interconnection allows the monitoring of larger topologies with ring redundancy. With
MRP interconnection, you are not limited to the maximum number of 50 devices in a ring
when configuring redundant network topologies. For information on the quantity structure
of MRP Interconnection, refer to the SCALANCE XM-400/XR-500 Web Based Management
(WBM) configuration manual
(https://support.industry.siemens.com/cs/ww/en/view/109760840).
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
PROFINET interface under "Operating mode" > "I-device communication" > "Export
Generic System Description file (GSD)".
application example (https://support.industry.siemens.com/cs/ww/en/view/73502293).
System overview
5.3 S7-1500 R/H-CPUs
103