Experimental Physics and
Industrial Control System

Hi,

I have some database templates that can act as tables of positions (and descriptions), meant to be used in concert with a ‘positioner’ database. There can be multiple tables (set 1, set 2, etc.), and the users can input sets of positions into the tables. Then they can select which table they want to use, and the positions are copied into the positioner table (along with descriptions). The copy operation supports put_callback. We also use channel access security to only permit beamline staff (and not general users) to edit some of the saved positions. It’s scalable to N positions, but the database templates have to be setup in advance, so you could have a few templates ready to go depending on need (6 positions, 12 positions, 18 positions, 32 positions, etc.).

The positioner part of the logic controls the motor moves, and calculates which ‘position’ the motor is at, based on some tolerance value.

It’s not nicely packaged in a support module I’m afraid, but I can send you the template files if you’d like. I actually think it’s easier to develop and maintain simple logic like this in database logic and not Python code. Although, if you need ultimate flexibility then a Python IOC may be a better solution. It’s also a pain having to setup and maintain multiple versions of the same files for different numbers of positions, although I can imagine these being generated by a script, and that would simplify things a bit.

There are also other similar solutions, like CS-Studio PVTable or load/save functions built into autosave, but these may not be what you need in this case.

Cheers,

Matt

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