In the gold mill I work for we do most of our regulatory control over the
node bus with no problems. Most of our control structure runs in a CP30,
and much of our I/O is through AB-stations to PLC5s. Setting up good error
handling and initialization is more critical when all the I/O and control
I would assume that your refinery is similar to ours in the sense
that the process units come down at different intervals for turn-around
maintenance. With that in mind, by connecting I/A nodes through the
carrier-band LAN you may run into issues.
1) You may end up with different versi
I have always been amused at the complete distrust the petrochem industry has
for electronic communications of control data.Possibly this stems over from
the early days of electronics when hardware was not reliable.
The practice here has always been to not allow CB-LAN regulatory control.
Our site philosophy is that no critical control functions should be allowed
across the LAN, we pass lots of "information" points around alright but stop
short of one block relying on another over the LAN, this approach was adopted
in our early days when we didnt know how reliable the LAN would b
