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1/28/2009 1:13 PM | |
Posts: 5822 Rating: (412)
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Dear ChessMaster, I fear your system requirements are really rough. To solve this you need a lot of system knowledge about the S7-200 and remote access features you need. I personally guess that the "remote monitoring" you want to do is either by MircoWin or an SCADA System of "some kind". So you have different ways. You may, · directly call the node by some number you have or· you want to connect to the node via Internet.Both is surely possible but not with every way. The EM241 you mentioned is a Modem but it is not made to connect to the Internet, it does not support IP at all, so it is no solution. The 241 would only allow the interconnection between another 241 of maybe a PC, if you work ASCII based. The other ways would be over SINAUT Micro SC OPC, in this case you need a central Server to get the MD 720-3 connected to. The GPRS unit needs to connect by itself it is not possible to connect to the MD from the Internet at all, this is due to the functionality of the used GPRS network and its NAT / SPI-Firewall used. This solution surely works but you need some Micro SC OPC Servers AND you need constant connection between the MD and the OPC Server, this may not very cheap. The SINAUT Micro SC OPC supports surely DynDNS... no problem. The solution without wireless interconnection would be on ADSL. There you need a Router, which is always needed to connect a CP 243-1 (Ethernet CP) to the Internet. The Router used may also use DynDNS to provide an interface to the Internet, without huge costs with the flat rates available today. To connect from your PC you may either use VPN (my preferred way) or you use Portforwarding (easier to handle but much more dangerous). This way you can access the PLCs by the public IP of the Router used. See also this application: WAN Access Methods Well these are the chances I see so far, at least for the S7-200. Best regards J_Bell |
1/30/2009 3:52 PM | |
Posts: 5822 Rating: (412)
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Dear ChessMaster, I would say you should check this Application out: WAN Access Methods Here you should especially care about the VPN document and the overview document. They may show you more the direction, as you need it. Best regards J_Bell |
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