Ten tools exposed via MCP:
list_plcs — list configured PLCs with connection status
get_plc_status — device state and connection status
read_variable — read single variable by symbol path
read_variables — batch read multiple variables
write_variable — write value (requires WriteAccess)
browse_symbols — list/search symbols
get_symbol_info — detailed symbol type info
get_device_info — device name, version, ADS state
get_ethercat_health — EtherCAT master summary
get_ethercat_slave — detailed slave info
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