# PyPLC The PyPLC tango device server for controlling Modbus based devices
This device server requires:
- Tango cpp packages
- PyTango library
- Fandango library
- Modbus Device Server
Information on how to obtain these packages is available at: www.tango-controls.org
See the /doc folder for more details
8.1: Further events optimization (requires fandango 14.6)
8.0: Optimized to send events on ModbusMap update
Added AverageModbusCycle attribute ModbusMap.trigger_callbacks filtered by changed address Use changed to keep array index that differ Added custom command to Regs call Added custom command to Maps Move mapping updates to SendModbusCommand Solve bug on Mapping periods (ms to s) Implement callbacks mechanism for maps (subscribe/trgger)
Other changes:
Solve bug when states not updated at Init solve bug on empty SnapFile property Add InputStatus commands, set callbacks if UseEvents allow false to disable snapshots added Utils file for exporting conversion methods to GUI's Set Device to FAULT if communication is lost Refactor lambdas init, pep8 and shorter IeeeFloats Refactor IeeeFloat/Ints2Float, errors/slices Add export(filename) to ModbusMap Clean Modbus proxy on exit to avoid coredumps