A Honeywell 9100e Controller upgrade path?

[cage_and_alam]

We have a system which controls the water filtration, gas and sewage pumping for a large vehicle maintenance depot.

This system has worked fine for over a decade now but it uses older honeywell 9100e controllers with 620 series I/O modules (forgive me if im making mistakes here, this is not my field!). Connected to the system is a PC running windows 3.1 with an array of software one of which is Honeywell PC Supervisor R160.

The task is to upgrade to a new PC with newer OS, upgrade up to modern controllers or I/O modules, etc to have the system work exactly the same as it does now.

There are a couple of constraints:

1) Original builders of the system are not available to assist and there is very little documentation available

2) The system can have little or no downtime



Its not a too complicated system. Basically:

-PC (Win 3.1) running PC Supervisor R160, et al.

-PC Connected to Honeywell Model 9100e Controller (Logic Processor 9010-016)

-The 9100e is connected to a few Honeywell EIPM 620-0073C and Honeywell Parralel I/O Module 621-9937

-These 620 I/O's are connected to a cabinet of solenoids which flip all the switches for the pumping equipment.

I am not in this field of engineering and have *limited* knowledge on this. So please excuse me if im talking nonsense, however is it technically feasible take a system like this and "upgrade" it? Even if would mean re-writing software, reverse engineering of the logic processes? We'd like it to be future-proof for the next 5-10 years


Any suggestions would be helpful or even better if someone could point me in the direction of a company which does this sort of work (if they exist that is)

Thanks

Cage,
TX