Software Redundancy with WinCC Flexible

ste_angioni

This is the solution i use and it works fine:

1. In both PLC A and PLC B logic (not redundant program) insert these commands:

SET

A DB1000.DBX 9.2 //(DB1000 is FB101 instance DB)

A DB1000.DBX 9.0

= M 2.0 //(use a spare MW, not included in the redundant M area)

SET

A DB1000.DBX 9.3 //(DB1000 is FB101 instance DB)

A DB1000.DBX 9.0

= M 3.0 //(use a spare MW, not included in the redundant M area)

This way PLC A will set M2.0 when master, PLC B will set M3.0 when master

2. In your WinCC project, create 3 PLC connections (i name them PLC, CPU_A, CPU_B), for the sake of simplicity assign PLC and CPU_A to your CPU A, assign CPU_B to your CPU B.

3. Assign all the tags to your PLC connection.

4. Create 2 more tags, CPU_A_MASTER (connected to CPU_A) and CPU_B_MASTER (connected to CPU_B), type byte, acquisition cyclic continuous (1 sec is ok). Assign to both tags an high limit of 0 (zero). Tag addresses are the bytes you change with the logic at item 1. (for me, MB2 and MB3)

3. Assign events on high limit, change connection, PLC should point to the corresponding connection (address of CPU A for CPU_A_MASTER, address of CPU B for CPU_B_MASTER)

This way you are always checking both PLCs to identify the master, and you are sure that at least one of the two is connected.

Regards

 Thank you very much!!! Worked and its perfect solution.

hello Stefano Angioni

i want ask you abour three connection you made PLC, CPU_A, CPU_B what adderes of each onefor connection with plc  second

i want know how i write this in non redundant program

thanks

Mr. Javed,

With the help of Scripting it is possible to communicate with both PLC.

 my program i have redudancy plc cpu 315-2dp in mpi and i have CP 343 -1 lean and i  connecd it with HMI wincc flexible . i dont know what should i do to make HMI understand the redundancy plc .

gfedf

hello Stefano Angioni

i want ask you abour three connection you made PLC, CPU_A, CPU_B what adderes of each onefor connection with plc  second

1. In both PLC A and PLC B logic (not redundant program) insert these commands:

SET

A DB1000.DBX 9.2 //(DB1000 is FB101 instance DB)

A DB1000.DBX 9.0

= M 2.0 //(use a spare MW, not included in the redundant M area)

SET

A DB1000.DBX 9.3 //(DB1000 is FB101 instance DB)

A DB1000.DBX 9.0

= M 3.0 //(use a spare MW, not included in the redundant M area)

This way PLC A will set M2.0 when master, PLC B will set M3.0 when master

i want know how i write this in non redundant program

thanks

 

 Hello

It should be written before the redundant blocks are called in main  OB.   Just follow the steps are described before. it works charm.

Dear All,

Kindly we need your support that i had the configuration of Redundancy for CP343-1 lean with Processor 315-2DP ,i did what exist at Ste_angioni post as the attached image but the communication failed when the Master CP 343-1 failed ,the slave CP not working We didn't know why ? CP A has IP  192.168.0.1 & 

            CP B has IP  192.168.0.2

Saleh 

Saleh_1

Dear All,

Kindly we need your support that i had the configuration of Redundancy for CP343-1 lean with Processor 315-2DP ,i did what exist at Ste_angioni post as the attached image but the communication failed when the Master CP 343-1 failed ,the slave CP not working We didn't know why ? CP A has IP  192.168.0.1 & 

            CP B has IP  192.168.0.2

Saleh 

Hello,

I have the same problem. When the Master change (A->B), the communication not change.

I try to assign PLC connection to CPU B. It's ok when the Master is CPU B, but when the Master change on CPU A, the communication with the HMI not change.

MarioSalamina

 

Saleh_1

Dear All,

Kindly we need your support that i had the configuration of Redundancy for CP343-1 lean with Processor 315-2DP ,i did what exist at Ste_angioni post as the attached image but the communication failed when the Master CP 343-1 failed ,the slave CP not working We didn't know why ? CP A has IP  192.168.0.1 & 

            CP B has IP  192.168.0.2

Saleh 

Hello,

I have the same problem. When the Master change (A->B), the communication not change.

I try to assign PLC connection to CPU B. It's ok when the Master is CPU B, but when the Master change on CPU A, the communication with the HMI not change.

 

 Hello both,

from your attachment I see that CPU A (CP 343-1 indeed) has IP 192.168.0.1, so I guess that CPU B has IP 192.168.0.2).

In the TAG editor, when CPU A MASTER exceeds limit value, you have to assign CPU A IP address (192.1680.0.1) to PLC_changeover. When CPU B MASTER exceeds limit value, you have to assign CPU B IP address (192.168.0.2) to PLC_changeover.

Basically, as long as both CP are working, HMI communication works. But as soon as you set the master offline, the changeover logic is pointing to the wrong partner.

Let me know if it works now.

Regards

Thank you very much  Stefano Angioni 

It's working well now,

Regards,

Saleh Hany