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Hello,
We have S 1211C V3.0.2 CPUs and I have found that it has safety issues that are fixed in V4. ....
But how I know is not possible to upgrade V3... to V4... bercause of different hardware.
Is there a V3... firmware to fix it?
http://www.securityweek.com/plc-worms-can-pose-serious-threat-industrial-networks
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