This python package is used to handle ELT standard devices directly from python objects and through OPC-UA.

The package is intended to be used when a full instrument ELT software is not available but scripting needs to be done on devices and using the Low Level ELT software (Running on Beckhoff PLC). A good exemple of the use case is making sequences of initialisation and movement of motors for AIT purposes without the need to buil a high level ELT software.

The documentation (for version >=0.3) is here

Sources are here

Install

> pip install pydevmgr_elt 

From sources :

> git clone https://github.com/efisoft-elt/pydevmgr_elt
> cd pydevmgr_elt 
> python setup.py install

Basic Usage

(since v0.5)

from pydevmgr_elt import Motor, wait


with Motor('motor1', address="opc.tcp://192.168.1.11:4840", prefix="MAIN.Motor1") as m1:
    wait(m1.move_abs(7.0,1.0), lag=0.1)
    print( "position is", m1.stat.pos_actual.get() )

Can also be done in the old way:

from pydevmgr_elt import Motor, wait
m1 = Motor('motor1', address="opc.tcp://192.168.1.11:4840", prefix="MAIN.Motor1")

try:
    m1.connect()    
    wait(m1.move_abs(7.0,1.0), lag=0.1)
    print( "position is", m1.stat.pos_actual.get() )
finally:
    m1.disconnect()

from pydevmgr_elt import Motor, DataLink

m1 = Motor('motor1', address="opc.tcp://152.77.134.95:4840", prefix="MAIN.Motor1")

m1_data = Motor.Data() # m1_data is a structure built with default value
m1_dl = DataLink(m1, m1_data) # create a data link use to fill m1_data to real hw values

with m1: # with conexte manager open/close a connection  
    m1_dl.download()
    print( m1_data.stat.pos_actual,   m1_data.stat.pos_error  )

Open from an elt yaml configuration file as defined in ELT IFW v3

from pydevmgr_elt import open_elt_device
motor1 = open_elt_device( "tins/motor1.yml" )