About nexidator

Is it just the mode displayed in the HMI that changes or is it really the operating mode of the PLC program? If the HMI shows wrong states that do not match the PLC, it usually helps to Activate the TwinCAT configuration, download the PLC program and restart the HMI afterwards. ... View more

We totally agree that using the value from the first instance for all other instances is bad behavior. As Düscha said, we have to look into the code a little bit deeper. (Unfortunately the colleague who developed this has retired in the meantime.) So, I am sure this will be fixed in the next version. As I understood, you never had the requirement that elements of the structure should be allowed to be missing in the telegram, but only the number of array elements (i.e. complete struct instances) should be variable. Is that correct? I also feel this makes more sense than allowing just any random struct element to be missing, because in this case it is impossible to find out what elements were actually received from MES and which ones just have default (or because of the current bug even wrong) values. Is anyone else using the AcceptIncompStructArray feature? Everyone is welcome to share their opinion about this here! ... View more

You are right, add-ons don't have their own state machine. And they are always called even if the parent handler is disabled. The reason is that it is not easy to tell what would be the expected behavior for an add-on. Some add-ons should definitely consider the UnitState of their parent, but there are others that should just continue working even if the parent is disabled. So it is really the responsibility of the add-on programmer to decide this. ... View more

The keyword %PlcHost% is replaced with the hostname or IP address configured for the target system where the PLC runtime is located by OES when exporting the HMI and DatAccess configuration, not at runtime. It has nothing to do with a PLC variable, and obviously inventing new keywords doesn't work. Best practice is to configure the hostname instead of the IP address at the target system hosting the PLC. In this case, you can use %PlcHost%. But the way you did it should also work. ... View more

The PLC export from OES should automatically install all required libraries. If there are still some libraries missing after exporting, something is wrong with the project. ... View more