Hello Opto Awesomes!
Here is the simplified situation:
Upon redundant controller failure, Modbus communication is tied up and can not be established with the new primary controller, until the strategy is restarted. When strategy restarts, set points revert to 0.00.
In depth situation:
We have around 10 environmental chambers on a redundant controller.
All the chambers are controlled by WATLOW F4’s. The F4’s communicate via Modbus. I have a SCM 232 module in position zero on a rack of one of the 3 Brains. Because we have one SCM module, only one F4 can have communication open at any time. The control chart cycles through, waits for the individual chamber charts to finish before moving to the next chamber. This all works well until…
We have a redundant controllers. When we simulate a controller failure, we can not regain communication with the F4 (probably due to the communication not getting closed properly?) until we restart the strategy. Upon strategy restart, all set points are lost and revert to 0.00. Not exactly optimum :[
I have redundant variables and sync blocks on the main and individual chamber charts and have a clear understanding of transactional carts. But toss Modbus in there (new to modbus) and all of a sudden 40 hours of my time has vanished along with my set points :(.
Help me Obi-Wan Opto-Awesomes, your my only hope…
Here is a list of hardware and software versions I am working with from memory:
PacProject Pro 9.6 (Control, Display and redundant manager)
Redundant Controllers (S2’s running the most recent firmware as of 03/21/19)
Arbiter (most recent Firmware as of 03/21/19)
Modbus Integration Kit
SCM Module position zero (version and brains i dont remember exactly)
Comunication Handle - ModbusMasterTCP with RTU protocol
Also have 2 OPC servers (main scanner and back up) but will integrated them after the communication is perfect unless I am advised otherwise.
Willing to bundle up the Strategy and Display files if requested.