Proof? While historically, PLCs are more stable than PCs, this isn’t true/ the whole picture. I have had PLCs fail within a year, and servers that have not been rebooted in years. Redundancy at the PC level is also easier. On top of that, it is usually other issues that drop the network, ie cables, switches, workstations, etc.
We routinely move control data from external sources into PLCs. Proper precautions must be taken, such as watchdog timing, and proper control narratives, but this works, and I would not recommend anyone shy away from this.
[quote=“Curlyandshemp”]The preferred method would have the two PLCs talk direct to each other. If they are both of the same family, and on the same network then messaging should be easy.
Disagree for 2 reasons. You don’t know his process. This may be acceptable, depending on his process requirements. Also, see my original response. No reason to stay away from control through a gateway device, process permitting.
So? Does this mean you are better that someone who has only been in the business for 10 years. 5 years, 1 year? Does 25+ years of experience matter if it has been poor implementations, and if so, does it make you better than 10 years of proper implementations? I’m not saying anything about you personally, just wondering what you mean by this comment.