text: <s>[INST] View Designer issue. I have a question.  Now I want to convert Panel Builder 32 program to View Designer. I have one issue regarding button settings: handshake tag exists in Panel Builder 32 but not in View Designer. Where to assign the handshake tag in View Designer? [/INST] Newer HMI software, such as View Designer and FT Optix, do not have this handshaking option. Older software, such as Panel Builder 32 and FT View ME, do have this option. I'm pretty confident the reason for this has to do with communications between the HMI and PLC. The older software were designed for systems that used some form of serial or early Ethernet communications. Thus, the connections between the HMI device and the PLC data were somewhat asynchronous or less 'real-time'. I believe to ensure that the changed value actually was written to the PLC, the handshake feature was used to keep the value written from the HMI active until the PLC confirms the change. The newer software were written based on modern hardware and modern communications, which are orders of magnitude faster and more stable. Thus, the connection of data between PLC and HMI is more real-time and feedback is kind of built in to the cyclic communications. The handshake feature doesn't exist anymore because it isn't necessary or valuable. Perhaps I'm totally wrong, but to me it is the most logical conclusion. The button touch on a PV5000 (with View Designer software) writes a new value to the PLC tag immediately and can read that tag value back an instant later to ensure that the data transfer completed. If there is an issue with the connection to the PLC tag, the HMI runtime actually notifies you of the error with a red X and an error dialog. The handshaking is built-in, so to speak. You don't need the handshake anymore. Maybe you have to make some changes in your PLC code to accommodate the new HMI. Every new project I have done with modern PLC and HMI does not use handshaking or separate .Value and .Indicator tags. There is just one tag tied to the writing element of the HMI and this works just fine. To implement the handshaking feature with View Designer would take some creativity and I don't think it is worth the effort. It would be easier to change the PLC code to remove the handshake requirement.\n </s>