Redundancy Settings

In the dialog, the behavior of the redundancy connection is set.

Number of connections

Indicates how many connections belong to this redundant connection.

Dynamic Master

You can choose Static Master or Dynamic Master.

The Static Master always tries to use the first connection. If this fails, it will switch to another connection. Once the first, so the master connection is available again is switched back to this.

The Dynamic Master retains the new connection as long as it is working.

Redundancy can be used with two or three connection channels.

Test method

Test connection

It is looked at the connection status, as soon as the is no longer OK, it is switched.

Use PLC status

For some PLCs, the status of the CPU can be determined, e.g. PLC in RUN.

If this option is selected, the status of the CPU is an indicator for switching.

Watchdog test

To make sure that the PLC is running and operating normally, a variable can be incremented in the PLC cycle.

This uses the redundancy switch as an indication whether everything is still OK.

If the watchdog source does not change anymore, the system switches over.

Method of writing

Master

It is written over the currently active connection

All (one good)

It is written over all links. If at least one OK returns, the writing has been successful.

All (all good)

It is written over all links. All must return OK for the letter to succeed.

See also Redundancy