S7 1500

Dear Experts,

Please explain to me what happens if the cable is faulty as shown in the attached picture:

1. Does the backup PLC take over?

2. Will the connection between Wincc/standar PLC and the Redundant PLC system lose data?

3. Has anyone tried this in practice?

Sincere thanks to the Experts.

Hello datttt98;

You show a WinCC v7.4 SP1 station in your screenshot.

WinCC v7,4 SP1 does not have the requirements to setup a connection to a redundant S7-1500H system. It can establish a connection to tehe primary CPU for example, using the S7-1200/1500 channel, but in case of loss of the primary CPU it cannot switch connection to the standby CPU.

You can verify this in the following document, in Ch. 5:

https://support.industry.siemens.com/cs/attachments/101908495/101908495_wincc_s71200_s71500_channel_v2_en.pdf

To do a changeover from the primary to the standby S7-1500H CPUs,  you need WinCC v7.5 SP1, as described in this .WinCC v5.5 SP1 Information System document, in the redundant S7-1500R/H section:

https://support.industry.siemens.com/cs/ww/en/view/109772961/127349029387

You could possibly try the example VB code used in WinCC v7.5 with your present system, but I have a nagging feeling it will not work. You need to be able to establish a system IP address aloowing connecto to primary and standby CPUs in turn, and I believe this faculty is only for WinCC v7.5 SP1.  Read the section "Configuring Redundant Control Systems" in the same manual:

https://support.industry.siemens.com/cs/ww/en/view/109772961/121614915979

Hope this helps,

Daniel Chartier

Dear Daniel Chartier,

it means wincc v7.4 sp1 cannot connect to system s7 1500H via system IP.

Thanks!