Tom Jenkins
Lifetime Supporting Member
I'm quoting a project where the customer wants to use Siemens PLCs. I'll have one master for scheduling, over all coordination, and linking my "sub-system" to a plant wide SCADA. There are three slaves for individual machines that only need to link to the master. Each PLC will have an HMI.
I want to use ladder logic for the programming so I can easily port over logic that works on other platforms. Based on I/O requirements and program complexity (low for both) the S7-200 will do the job, and will also handle my "sub-system" communications network plus my HMI. So far, so good.
However, the customer wants to tie my master to his SCADA and some S7-505's using ethernet, and require the ethernet to comply with IEEE 802.3. According to my Siemens distributor and the Siemens literature, it looks like the only way to do this is to use an S7-300 for my master. I'd rather not do this. The extra hardware cost doesn't bother me, but it looks like the S7-300 is entirely different programming software from the S7-200. (Why do they do things like that???)
So, could you guys look in your collective hats and let me know if you have any rabbits to pull out that will let me tie the S7-200 to the ethernet link. I'm thinking in terms of third party hardware or some kind of bridge that will get the S7 variant of ethernet into Profibus or the MPI protocol.
Thanks,
Tom
I want to use ladder logic for the programming so I can easily port over logic that works on other platforms. Based on I/O requirements and program complexity (low for both) the S7-200 will do the job, and will also handle my "sub-system" communications network plus my HMI. So far, so good.
However, the customer wants to tie my master to his SCADA and some S7-505's using ethernet, and require the ethernet to comply with IEEE 802.3. According to my Siemens distributor and the Siemens literature, it looks like the only way to do this is to use an S7-300 for my master. I'd rather not do this. The extra hardware cost doesn't bother me, but it looks like the S7-300 is entirely different programming software from the S7-200. (Why do they do things like that???)
So, could you guys look in your collective hats and let me know if you have any rabbits to pull out that will let me tie the S7-200 to the ethernet link. I'm thinking in terms of third party hardware or some kind of bridge that will get the S7 variant of ethernet into Profibus or the MPI protocol.
Thanks,
Tom