Welcome to our new forum
All users of the legacy CODESYS Forums, please create a new account at account.codesys.com. But make sure to use the same E-Mail address as in the old Forum. Then your posts will be matched.
Close
I have a redundant setup with two 750-842's communicating tcp/ip via modbusmaster udp FB with a 750-352 dumb i/o setup.
1) I have wired connections between the 842's so that if the primary PLC fails, the backup receives an input and takes over. Is there an easy way/FB available that would allow me to skip the main body of the program as long as the primary PLC is OK?
The redundancy requirements do not require the PLC's be synced. I believe the term is a "Master Relay Function" where the program would simply be idle until it is called to take over.
2) When I lose power to my controller, the program is erased. How do I use Codesys 3.2 to write the program to flash memory?
Thanks,
Jason
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Hi,
I have a redundant setup with two 750-842's communicating tcp/ip via modbusmaster udp FB with a 750-352 dumb i/o setup.
1) I have wired connections between the 842's so that if the primary PLC fails, the backup receives an input and takes over. Is there an easy way/FB available that would allow me to skip the main body of the program as long as the primary PLC is OK?
The redundancy requirements do not require the PLC's be synced. I believe the term is a "Master Relay Function" where the program would simply be idle until it is called to take over.
2) When I lose power to my controller, the program is erased. How do I use Codesys 3.2 to write the program to flash memory?
Thanks,
Jason
1) use event in resources task
2) make it boot (be sure the switch is correct position under the small lid.