4/15/2020 3:24 PM | |
Joined: 3/14/2008 Last visit: 9/20/2024 Posts: 2095 Rating: (936)
|
Hi, The disadvantage of process tag types is the synchronizing, once instances are created, synchronizing is not possible or at least very limited . You have to delete the instances and create them again with the Import Export Assistant. A better solution and future proof solution is using Control Module Types, which is based on the same concept as PTT, but you can synchronize them and create variants as well. You create them once in the MDL and can instance them in the project(s). Disadvantage of CMT is that you actually need Plant Automation Accelerator to bulk engineer. You can create instances manually by copying CMT in the project one by one. |
Last edited by: Oreca at: 04/15/2020 15:32:04If I could help you, you can use the RATE button. Thank you. |
|
This contribution was helpful to1 thankful Users |
4/16/2020 8:52 AM | |
Joined: 3/14/2008 Last visit: 9/20/2024 Posts: 2095 Rating: (936)
|
Hi, Well, any PCS7 project should have a master library. This is even more important since PCS7 V9.0 since the new concept EMT's/EPHT's. It's not related to PTT alone. And you are right, the problem is that most changes are not synchronized. Also changes to the instances are not checked and due the fact that you must delete the instances once you have made changes to the type, you will lose the specific changes to the instances. Update process tags is possible, but is limited. I can find a list which items can be updated to the instances if you want. I think it's better to use CMT's. The PTT concept is not updated/maintained anymore since PCS7 V6.1 or so and since V8.1 Siemens introduced CMT concept. Since V9.0 Siemens introduced the EMT/EPHT concept. The CMT are also used in the EMT/EPHT and is future proof. The advantage of CMT is that the synchronization is a lot better. Since V9.0 UC01 or UC02, it's not even possible to make changes anymore to the instances without enabling it in the type, except for the variables with S7_m_c attribute. There are two possibilities to do so: One is by using the Technological Editor (used with Plant Automation Accelerator) or by ignoring variables by using the Type Update Settings under the block properties. The variables you want to ignore will get a pink color and those variables are permitted to be changed on the instances. Maybe a little too much information at the moment, but I highly suggest using CMT's rather than PTT since it's future proof.
|
If I could help you, you can use the RATE button. Thank you. |
|
This contribution was helpful to2 thankful Users |
Follow us on