Python wrapper for TwinCAT ADS library
Project description
This is a python wrapper for TwinCATs ADS library. It provides python functions for communicating with TwinCAT devices. pyads uses the C API AdsDLL.dll. The documentation for the ADS API is available on infosys.beckhoff.com.
Changelog
Version 2.0.0
I wanted to make the Wrapper more pythonic so I created a new module named pyads.ads that contains all the functions from pyads.pyads but in a more pythonic way. You can still access the old functions by using the pyads.pyads module.
Improvements:
more pythonic function names (e.g. ‘write’ instead of ‘adsSyncWrite’)
easier handling of reading and writing Strings
no error codes, if errors occur an Exception with the error code will be raised
Examples
Open port and create a AmsAddr object for remote machine.
>>> import pyads
>>> pyads.open_port()
32828
>>> pyads.get_local_address()
<AmsAddress 192.168.0.109.1.1:32828>
>>> adr = pyads.AmsAddr('5.33.160.54.1.1', 851)You can read and write a variable by name from a remote machine.
>>> pyads.read_by_name(adr, 'global.bool_value', pyads.PLCTYPE_BOOL)
True
>>> pyads.write_by_name(adr, 'global.bool_value', False, pyads.PLCTYPE_BOOL)
>>> pyads.read_by_name(adr, 'global.bool_value', pyads.PLCTYPE_BOOL)
FalseIf the name could not be found an Exception containing the error message and ADS Error number is raised.
>>> pyads.read_by_name(adr, 'global.wrong_name', pyads.PLCTYPE_BOOL)
ADSError: ADSError: symbol not found (1808)Reading and writing Strings is now easier as you don’ t have to supply the length of a string anymore. For reading strings the maximum buffer length is 1024.
>>> pyads.read_by_name(adr, 'global.sample_string', pyads.PLCTYPE_STRING)
'Hello World'
>>> pyads.write_by_name(adr, 'global.sample_string', 'abc', pyads.PLCTYPE_STRING)
>>> pyads.read_by_name(adr, 'global.sample_string', pyads.PLCTYPE_STRING)
'abc'Setting the ADS state and machine state.
>>> pyads.write_control(adr, pyads.ADSSTATE_STOP, 0, 0)
Toggle bitsize variables by address.
>>> data = pyads.read(adr, INDEXGROUP_MEMORYBIT, 100*8 + 0, PLCTYPE_BOOL)
>>> pyads.write(adr, INDEXGROUP_MEMORYBIT, 100*8 + 0, not data)Read and write udint variable by address.
>>> pyads.write(adr, INDEXGROUP_MEMORYBYTE, 0, 65536, PLCTYPE_UDINT)
>>> pyads.read(adr, INDEXGROUP_MEMORYBYTE, 0, PLCTYPE_UDINT)
65536Finally close the ADS port.
>>> pyads.close_port()Release history Release notifications | RSS feed
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