leem2209
Lifetime Supporting Member
Hello all,
Just looking into a little error on a valve in our plant, the valve isn't reacting to signals. The DCS is calling for the valve to move but no reaction. Give a simulated 4-20mA signal onto the valve controller and it responds... checked the analogue output from the SM332 card and zilch, nada, nothing.
Dodgy SM332 card... now I've been told that these are hot-swappable and Siemens info confirms:
As the plant runs continuously I don't have the luxury of doing a power down replacement. Looking at what will be affected during the swap, there's 6 out of 8 outputs used on this card, and hopefully that is all that would be affected. But, as these are all on a Backplane Bus, surely removing this would cut out all the analogue cards connected after it? There's approx. 5 more cards connected on the rack after this one... that's a lot of systems to loose.
Just after as much info before I do anything as we may have to schedule a plant stoppage in order to change. But if we can get away with a hot-swap then that would be great!
Just looking into a little error on a valve in our plant, the valve isn't reacting to signals. The DCS is calling for the valve to move but no reaction. Give a simulated 4-20mA signal onto the valve controller and it responds... checked the analogue output from the SM332 card and zilch, nada, nothing.
Dodgy SM332 card... now I've been told that these are hot-swappable and Siemens info confirms:
"When used in the ET 200M distributed I/O system together with active bus modules, hot swapping of the digital input/output modules is possible without any reaction. The remaining modules continue to operate."
As the plant runs continuously I don't have the luxury of doing a power down replacement. Looking at what will be affected during the swap, there's 6 out of 8 outputs used on this card, and hopefully that is all that would be affected. But, as these are all on a Backplane Bus, surely removing this would cut out all the analogue cards connected after it? There's approx. 5 more cards connected on the rack after this one... that's a lot of systems to loose.
Just after as much info before I do anything as we may have to schedule a plant stoppage in order to change. But if we can get away with a hot-swap then that would be great!