Opc_quality_bad = $00;
Opc_quality_uncertain = $40;
Opc_quality_good = $c0;
Opc_quality_config_error = $04;
Opc_quality_not_connected = $08;
Opc_quality_device_failure = $0c;
Opc_quality_sensor_failure = $10;
Opc_quality_last_known = $14;
Opc_quality_comm_failure = $18;
Opc_quality_out_of_service = $1c;
Opc_quality_waiting_for_initial_data = $20;