What does the Cimplicity software assume, when it calculates the PSU loading?, and how accurate is it if says a PSU is over-loaded to say 112%?, and at what point should I get concerned?
Background: I have got a customer, who has three hydro-electric turbines in Scotland, that each have been controlled by their own Alspa PLC, programmed using P8 software (GE Fanuc - rebadged - Series 90/30, & logic master respectively), and which have been running with no problems for the last 15 years or so.
However, due concern that that CPU being used is technically obsolete (CPU311), and the site programming laptop (with DOS O/S) is getting towards the end of its life.
He is looking to update, so as to be able to continue site running.
We are looking to use a CPU350 (to match other existing CPUs onsite), and will have to replace the CPU PSUs with IC693PWR331, as Alspa renumbered their PSUs (from PWR322 to PWR325), and the Proficy software which is to replace the P8 (logic-master) software, doesn't recognise it.
However, when I import the old PLC program into the Proficy; the Proficy says that the CPUs are overloaded: (2 are at 105%, and one is at 112%), despite the fact they have been running without any problems for several years.
Is there a problem or not?
Background: I have got a customer, who has three hydro-electric turbines in Scotland, that each have been controlled by their own Alspa PLC, programmed using P8 software (GE Fanuc - rebadged - Series 90/30, & logic master respectively), and which have been running with no problems for the last 15 years or so.
However, due concern that that CPU being used is technically obsolete (CPU311), and the site programming laptop (with DOS O/S) is getting towards the end of its life.
He is looking to update, so as to be able to continue site running.
We are looking to use a CPU350 (to match other existing CPUs onsite), and will have to replace the CPU PSUs with IC693PWR331, as Alspa renumbered their PSUs (from PWR322 to PWR325), and the Proficy software which is to replace the P8 (logic-master) software, doesn't recognise it.
However, when I import the old PLC program into the Proficy; the Proficy says that the CPUs are overloaded: (2 are at 105%, and one is at 112%), despite the fact they have been running without any problems for several years.
Is there a problem or not?