As with all other Prolink v.4.2 products,
QC-PLC now runs as a 64 bit application and service in Windows. This allows the service to take advantage of more memory when running spec plans.
As of 4.2, QC-PLC now fully supports the newer OPC-UA standard for PLC communication.
As of 4.0, QC-PLC now fully supports the OPC-DA standard for PLC communication. Users navigate to tags using an Windows Explorer treeview style interface.