ProSoft Technology PLX81-EIP-61850 - Manual (Page 85)

PLX8x-EIP-61850 ♦ Communication Gateway Reference
Server to
IEC 61850 Client User Manual
ProSoft Technology, Inc. Page 85 of 167
July 2, 2015
5.4.2 Tag Database
The Tag Database is a key part of the internal workings of the gateway. Upon
restart, the Tag Database reads the configuration file, and process the tags. Data
is stored in the gateway’s memory, and referenced through tag names. The
number of tags is limited to the memory capability of the hardware and the
process memory required by gateway.
The data of varying data types are stored in the gateway. This impacts that
maximum number of tags the gateway can hold.
Some data types are considered Native data types to the gateway, and some are
considered Complex. Complex data types are for the creation of the user-defined
data types, which are necessary for many IEC 61850 data types.
Native data types
Native data types are the data types used internal to the gateway. When the data
is transferred from IEC 61850 to EtherNet/IP, it is first stored in the tag database,
using the following data types:
Name Definition Bits
BOOL Boolean 1
BYTE Byte 8
UBYTE Unsigned Byte 8
INT Integer 16
UINT Unsigned Integer 16
DINT Double Integer 32
UDINT Unsigned Double Integer 32
REAL IEEE 754 Single Precision Floating-Point 32
DREAL IEEE 754 Double Precision Floating-Point 64
STRING ASCII Character Array 32 + 8* Length
DATETIME UTC microsecond precision date and time 64