Log files for the reporting services and data loaders are available in the logs subdirectory in the PERF directory (EGO_TOP/perf/logs).
There are seven logging levels that determine the detail of messages recorded in the log files. In decreasing level of detail, these are ALL (all messages), DEBUG, INFO, WARN, ERROR, FATAL, and OFF (no messages). By default, all service log files log messages of INFO level or higher (that is, all INFO, WARN, ERROR, and FATAL messages).
You can change the logging level of the reporting services or the data loaders by editing the log4j.properties file.
You can dynamically change the logging level of the plc service or the data loaders using the loader controller client tool, but these changes will be lost if you restart the plc service.