GE EPM 9650/9800 manual Digital Input Snapshot Log Format, Digital Input Snapshot Data Pointers

6.10: Digital Input Snapshot Log Format

Digital Input Snapshot Log: The Digital Input Snapshot Log will fill to the total allocated memory. The number of records possible in the Digital Input Log is the total memory allocated divided by the record size (size of a Digital Input Snapshot).

Profile Information is in the Programmable Settings Block.

Digital Input Snapshot Record Size: (45463)

This Register is an enumeration for the size of a record in the Digital Input Snapshot Log. The valid values are:

0x00000 = 32 byte records

0x00001 = 64 byte records

0x00002 = 128 byte records

0x00003 = 256 byte records

0x00004 = 16 byte records

Digital Input Snapshot Data Pointers: (45205-45332)

These Registers indicate which information to include in a record in the Digital Input Snapshot Log. Each Data Pointer has the following 4 (four) byte structure:

Size		Format	Description
	2 byte	unsigned int	Line Number
1 byte		unsigned char	Point number
1 byte		unsigned char	Reserved

A Line Number is an index into the Communication Table. Example - Line Number 11 is for the 12th line in the Communicatin Table, 0.1 second Phase-to-Neutral Voltages. Data Pointers with Line Numbers greater than the number of lines in the table are ignored.

A Point Number is an index into the Communication Table.

Example: Point Number 1 is for the second entry in a Line. Line Number 11, Point Number 1 is the second in the twelfth line, 0.1 second VBN. Data Pointers with Point Numbers greater than the number of points for the line are ignored.

Record Format: A Record contains as many bytes as specified by the Digital Input Snapshot Record Size Field in the Programmable Settings Block (45463). The first eight bytes in each record is the Time Stamp. The format of the Time Stamp is:

Byte		Format	Range	Description
	0	binary	0 – 99	century
1		binary	0 – 99	year
2		binary	1 – 12	month
3		binary	1 – 31	day
4		binary	0 – 23	hour

6-26