Data types of the History DB

For archiving with the History DB the following variable types are supported:

• TIME_VAR

• BIT_VAR

• INTEGER_VAR

• UINTEGER_VAR

• FLOAT_VAR

• BIT32_VAR

• CHAR_VAR

• DPIDENTIFIER_VAR

• TEXT_VAR

• DYNTIME_VAR

• DYNBIT_VAR

• DYNINTEGER_VAR

• DYNUINTEGER_VAR

• DYNBIT32_VAR

• DYNFLOAT_VAR

• DYNCHAR_VAR

• DYNDPIDENTIFIER_VAR

• DYNTEXT_VAR

Since the value archive converts DPEs of type "time" into "double" a rounding error can occur at the last position of msec, (for example, a value 1999.01.01 01:00:00.030 is returned as 1999.01.01 01:00:00.029). This does not regard common time information (_stime).