Error variable is write protected
During plausibility check i get the error 1000.2.04502 Error: You must not write to the variable "Variable name", because it is write protected.
and also follow up error 1000.2.04503 Error: Output "variable name" is used as an input.
i get this error sometimes when I import blocks from other PLC programs, to solve it so far i have renamed the variable, created a new and then manually changed all old uses of the variable to the new and then it works again.
and now i have had this error a couple of times...
I am using Freelance Controlbuilder F 2013.
Please check if mentioned variables aren't alocated as IOs in Hardware manager. All these are protected agains writing and the only way to change them manualy is to force them.
The easy way to check it is to go to Variable list and see if there is anything in Location column next to mentioned variables name.
Hope it helps,