ProSoft Technology PLX8X-MNET-61850 - Manual (Page 144)

Reference PLX8x-MNET-61850 ♦ Communication Gateway
User Manual Modbus TCP/IP to IEC 61850
Page 144 of 228 ProSoft Technology, Inc.
May 14, 2014
6.3.2 Tag Database
The Tag Database is a key part of the internal workings of the gateway. Upon
restart, the Tag Database will read 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 Modbus TCP/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