How do i change a set point on controller 800xa. when i change on FB it goes back to default !
Hi i need to change a temperature set point - 100 to 90 degrees on ABB 800xa controller.
I have gone online but whenever i change it on the block it reverts back to 100 again.
What could be the problem? Does it mean i can not change a set point in online mode?
I have done it on Siemens PLC..!
Please assist, the procedure step by step..!
You need to be sure you are not writing this setpoint in other location of your program or in HMI system, if you are writing this sepoint, then the value that this source have override the value you put in online mode.
you can try with find option that show you all references that use this variable.
I am not sure which close loop FB from which library you are using with system 800xA controller, however in general it depends on selection of SP mode internal or external, incase internal SP mode is selected it should allow you to change SP value from FB parameters in online mode, incase external SP mode is selected it will not allow you to change SP value from FB parameter in online mode. It must be taking some value (in your case it is 100) from the connection where SP pin is connected with! Or other reasons could be SP limits, SP tracking or syn auto to man mode settings. Better to go through your close loop FB help.
If you are dealing with in-house project setup no harm in playing around but in case of running plant be cautioned with changing SP and tuning parameter values.Hope it helps to you.