  CONST
    ioc$unit_ready_to_not_ready = 1,
    ioc$unit_not_ready_to_ready = 2,
    ioc$internal_error = 3,
    ioc$controller_reserved = 4,
    ioc$unit_reserved = 5,
    ioc$recovered_abnormal_error = 6,
    ioc$channelnet_input = 7,
    ioc$device_error = 8,
    ioc$log_pp_message = 9,
    ioc$channel_connection_input = 13,
    ioc$device_operational = 14,
    ioc$flow_control_status_change = 15;
