Am I old school?
Now networks are getting vey fast are you directly addressing tags in the PLC or do you create a dedicated HMI/Scada memory area in your controllers?
I am seeing more and more systems that directly address tags in the PLC, a recent project having numerous PLC's on the network and upward of 50k tags, a mixture of most data types, real,long,int,bool,time etc. To me it seems sluggish, but I have not spent enough time to analyse the cause of the problem.
Having done this for many years, I am 1 who has a dedicated memory area for HMI/Scada tags, it takes more planning but I find having all the tags in a consecutive memory location drivers are generally more efficient.
Just interested to see what others are doing.
Now networks are getting vey fast are you directly addressing tags in the PLC or do you create a dedicated HMI/Scada memory area in your controllers?
I am seeing more and more systems that directly address tags in the PLC, a recent project having numerous PLC's on the network and upward of 50k tags, a mixture of most data types, real,long,int,bool,time etc. To me it seems sluggish, but I have not spent enough time to analyse the cause of the problem.
Having done this for many years, I am 1 who has a dedicated memory area for HMI/Scada tags, it takes more planning but I find having all the tags in a consecutive memory location drivers are generally more efficient.
Just interested to see what others are doing.