25.11.1 Usage Capacity of
Sampled Data
When saving to backup memory (SRAM), sampling data usage
capacity differs depending on the Number of Sampling Groups, Data
Length, Number of Data (Addresses) and the [Mode] tab settings.
Without the sampling settings, the usage capacity is 0
bytes.
-
The capacity of the backup memory (SRAM) that
you can use for sampling data depends on the type of display unit
and the space used by other data. For details about backup memory
(SRAM), please see the following.
 2.3 About the Display
Unit's Internal Data
-
To check the backup memory (SRAM) usage, from
the [Project (F)] menu, point to [Information (I)], select [Project
Information (I)], and then select [SRAM Information].
Calculation
|
(4 + 4 x Number of Groups) + each Sampling Group's total usage
capacity
|
|
20 + Number of Blocks x Occurrences*1 ×
[2*2 × Number of
Data*3 +
12*4 +
(Number of
Data+31)/32×4*5]
|
Calculation Examples
|
Setting
|
Description
|
|
Number of Groups
|
1
|
|
Data Type
|
16 Bit
|
|
Blocks
|
1
|
|
Occurrences
|
100
|
|
Number of Data (Addresses)
|
7
|
(4 + 4 x Number of Groups) + [20 + Blocks x
Cycles x {(Number of Data + 31)/32 x 4 + 2 x (Number of Data +
1)}]
(4+4×1)+[20+1×100×{(7+31)÷32×4+2×(7+1)}]
= 2103 bytes
(4 + 4 x Number of Groups) + [20 + Blocks x
(Cycles + 1) x {(Number of Data + 31)/32 x 4 + 2 x (Number of Data
+ 1) + 12}]
(4+4×1)+[20+1×(100+1)×{(7+31)÷32×4+2×(7+1)+12}]
= 3260 bytes
Indication of the number of sampling data you
can save
The save area size differs depending on the display unit model.
On models with 320 KB backup memory (SRAM), you can save a maximum
163,244 units of data for all sampling groups when you use both
backup memory (SRAM) and working memory.
However, when backup memory (SRAM) is used for other features,
the capacity for sampling data decreases.
Estimate when you use a display unit with 320 KB of SRAM (using
only data sampling)
|
Condition
|
Backup Memory (SRAM)
|
Working Memory
|
|
Word data only
|
Up to 81,332
|
Up to 81,912
|
|
Word data + Time data
|
Up to 20,332
|
Up to 20,476
|
|
Word data + Word data + Data Valid/Invalid
Flag
|
Up to 40,664
|
Up to 40,954
|
|
Word data + Time data + Data Valid/Invalid
Flag
|
Up to 16,264
|
Up to 16,380
|
|
