> It shows in the state of PLC/HMI Development tools.
i mean you are talking about upgrading things that are going to be in service for decades perhaps. the requirements for the programs is generally not complicated. turn on a pump for a time, weigh something and then alarm if some sensor doesn't see something.
Structured text was an improvement over ladder logic as you could fit more of the particular program in the screen real estate you had and could edit it easier since it was just text. though, that had its own set of issues that needed to be worked through and it wasn't a panacea.
i mean you are talking about upgrading things that are going to be in service for decades perhaps. the requirements for the programs is generally not complicated. turn on a pump for a time, weigh something and then alarm if some sensor doesn't see something.
Structured text was an improvement over ladder logic as you could fit more of the particular program in the screen real estate you had and could edit it easier since it was just text. though, that had its own set of issues that needed to be worked through and it wasn't a panacea.