20.15 Space Requirements for Alarm History Data

The space on the backup SRAM required for saving the Alarm History data depends on the type of display unit and the number of [Records] of all blocks, the number of registered messages (addresses) and the [Alarm Type] settings.

When no message is registered, the data size is 0 bytes, regardless of the [Backup History] setting.

Calculation 1

If you are using the SP5000 series, GP4000 series (excluding GP-410*), LT4000 series, or IPC series, use the following calculations.

1104

+ Block 1 Records x {44 + 4 + (Number of Addresses+ 15) / 16 x 4 +Number of Addressesx 4}

+ (Apply the same calculation as Block 1 for Blocks 2 to 8)

+ (4 x Number of registered messages) + (16 x Number of registered messages) + (4 x Number of registered messages)]

1104

+ Block 1 Records x {44 + 4 + (Number of Addresses + 15) / 16 x 4 + Number of Addresses x 4}

+ (Apply the same calculation as Block 1 for Blocks 2 to 8)

+(Block 1 registered message number) + 31)/32 x 4

+ (Apply the same calculation as Block 1 for Blocks 2 to 8)

Calculation 2

If you are using the GP3000 series, GP-4100 series (Monochrome Model), LT3000 series, or ST3000, use the following calculation.

576

+ Block 1 Records x {28 + 4 + (Number of Addresses + 15) / 16 x 4 + Number of Addresses x 4}

+ (Apply the same calculation as Block 1 for Blocks 2 to 8)

+ (4 x Number of registered messages) + (16 x Number of registered messages) + (4 x Number of registered messages)]

576

+ Block 1 Records x {28 + 4 + (Number of Addresses + 15) / 16 x 4 + Number of Addresses x 4}

+ (Apply the same calculation as Block 1 for Blocks 2 to 8)

+(Block 1 registered message number) + 31)/32 x 4

+ (Apply the same calculation as Block 1 for Blocks 2 to 8)

Calculation Examples

Setting

Description

Backup Alarm History

Set

Setting for Block 1

-

Number of Records for Block 1

768

Number of Addresses for Block 1

3

Number of Registered Messages for Block 1

2048

Settings for Blocks 2 - 8

None

1104 + [768 x {44 + 4 + (3 + 15) / 16 x 4 + 3 x 4}] + (4 x 2048) + (16 x 2048) + (4 x 2048)

= 1104 + {768 x (44 + 4 + 4 + 12)} + (4 x 2048) + (16 x 2048) + (4 x 2048)

= 99408 bytes (approximately 97 KB)

1104 + [768 x {44 + 4 + (3 + 15) / 16 x 4 + 3 x 4}] + {(2048 + 31) / 32 } x 4

= 1104 + {768 x (44 + 4 + 4 + 12)} + 64 x 4

= 50512 bytes (approximately 49 KB)

576 + [768 x {28 + 4 + (3 + 15) / 16 x 4 + 3 x 4}] + (4 x 2048) + (16 x 2048) + (4 x 2048)

= 576 + {768 x (28 + 4 + 4 + 12)} + (4 x 2048) + (16 x 2048) + (4 x 2048)

= 98880 bytes (approximately 96 KB)

576 + [768 x {28 + 4 + (3 + 15) / 16 x 4 + 3 x 4}] + {(2048 + 31) / 32 } x 4

= 576 + {768 x (28 + 4 + 4 + 12)} + 64 x 4

= 49984 bytes (approximately 48 KB)