pyads 1.3.0

Python wrapper for TwinCAT ADS library

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.

Some Samples

open port, set port number to 801

>>> port = adsPortOpen()
>>> adr = adsGetLocalAddress()
>>> adr.setPort(PORT_SPS1)

set ADS-state and machine-state

>>> adsSyncWriteControlReq(adr, ADSSTATE_STOP, 0, 0)

read bit %MX100.0, toggle it and write back to plc

>>> data = adsSyncReadReq(adr, INDEXGROUP_MEMORYBIT, 100*8 + 0, PLCTYPE_BOOL)
>>> adsSyncWriteReq(adr, INDEXGROUP_MEMORYBIT, 100*8 + 0, not data)

write an UDINT value to MW0 and read it from plc

>>> adsSyncWriteReq(adr, INDEXGROUP_MEMORYBYTE, 0, 65536, PLCTYPE_UDINT)
>>> adsSyncReadReq(adr, INDEXGROUP_MEMORYBYTE, 0, PLCTYPE_UDINT)

write a string value in MW0 and read it from plc

>>> adsSyncWriteReq(adr, INDEXGROUP_MEMORYBYTE, 0, "Hallo, wie geht es?", PLCTYPE_STRING)
>>> adsSyncReadReq(adr, INDEXGROUP_MEMORY_BYTE, 0, PLCTYPE_STRING)

read a value of type real from global variable foo

>>> adsSyncReadByName(adr, ".foo", PLCTYPE_REAL)

write a value of type real to global variable bar

>>> adsSyncWriteByName(adr, ".bar", 1.234, PLCTYPE_REAL)

close port

>>> adsPortClose()