I want to restrict the access to write specific variables in the data layer at a specific point of a plc program. In other words, I want to control whether someone can write a data layer variable or not within the plc, e.g. with an FB. Is this possible and how?
Hello, it's not possible to restrict the access of data layer variables by the PLC. You can restrict the access, user depended, by using scopes, but scopes can't be changed by the PLC.
One possibility would be to have a data interface set up via the PLC that customers should write to but for your processes internally you are using a copy of it. For the case no one should be able to interact you simply could stop copying the data from the interface to your used internal variable and overwrite the data in the interface to actual value out of the PLC.
