Update and enhance your Siemens APACS+ system with the DP I/O bus link without replacing any of your current I/O modules or disturbing your expensive field wiring. When you upgrade your existing controllers, youāll not only keep your APACS+ I/O modules, youāll also get the advanced features and functions of SIMATIC PCS 7.Ā You can alsoĀ upgrade your existing safety controllers with QUADLOG DP/IO Bus Link, so you will not only keep your TĆV-certified QUADLOG I/O modules, but also get the advanced features and functions of the fail-safe safety system: SIMATIC PCS 7 F. The upgrade adds more computing power to your existing system. You can select multiple scan rates and get scan times down to 10 milliseconds ā allowing you to add more capacity and flexibility to your existing system, and because you wonāt need to remove your existing field wiring using our APACS+ DP/IO Bus link, you can keep your existing I/O and discover significant cost savings. The same thing goes for the QUADLOG DP/IO Bus Link. You wonāt need to remove your existing field wiring, and can keep your existing TĆV-certified I/O.