Hi Experts!
I have good experience with the Siemens Step7 Microwin (programming a lot of S7-200 PLCs). I am now trying to program a ET200S with the Step7 - Simatic. I have little experience with it. So please help me, I have couple of questions:
1. How do you program logic that operates only for the first scan? I see OB101 or so for it but wondering which one to use - Warm start, Cold, Hot.. Also, is there a "Always_On" system bit?
2. Is there something similar to a V memory? I see M memory but looks like it can be used only for 256 bytes. Do I need to use DBs for it?
3. Also, if I need to update the program to another ET200S, can I just move the memory card?
Thanks.
I have good experience with the Siemens Step7 Microwin (programming a lot of S7-200 PLCs). I am now trying to program a ET200S with the Step7 - Simatic. I have little experience with it. So please help me, I have couple of questions:
1. How do you program logic that operates only for the first scan? I see OB101 or so for it but wondering which one to use - Warm start, Cold, Hot.. Also, is there a "Always_On" system bit?
2. Is there something similar to a V memory? I see M memory but looks like it can be used only for 256 bytes. Do I need to use DBs for it?
3. Also, if I need to update the program to another ET200S, can I just move the memory card?
Thanks.