Mitsubishi Electric Melsec Q Series User Manual page 57

6 Buffer memory
6.3 Measurement sections (Un \ G100 to Un \ G2999)
This product divides the measuring data into the Data and Multiplier, and output them to Buffer memory.
Actual measuring data is obtained by the following formula.
Measuring data = Data × 10
(Example)
The values output to the Buffer memory are as follows when total current is measured 123.456A.
Data (Un \ G218, 219): 123456
Multiplier (Un \ G200): -3
The actual measuring data is obtained from the value of Buffer memory as follows.
Measuring data = Data × 10
= 123.456 A
6.3.1 Multiplier of electric energy (Un \ G100)
Multiplier of electric energy are stored.
As to how the multiplier is determinate, refer to section 4.2.1 (3).
(1) Details of stored data
(a) Storage format
Data are stored as 16-bit signed binary in the buffer memory.
- Data range: -5 to -1
(b) Update timing
It will be updated when phase wire system (Un\G0), primary voltage (Un\G1), and primary current
(Un\G2), primary voltage of VT(Un¥G5), secondary voltage of VT(Un¥G6), primary current of
CT(Un¥G7) are set.
6.3.2 Electric energy (consumption) (Un \ G102,103), electric energy (regeneration) (Un \ G104,105)
Stores the electric energy of the consumption side and the regeneration side will be stored.
(1) Details of stored data
(a) Storage format
Data are stored as double-word 32-bit signed binary in the buffer memory.
- Data range: 0 to 999999999
When the stored data exceeds 999999999, stored data turns to 0 and continues measuring.
*Restrictions for measured data including resolution and measuring range, refer to section 4.2.1.
(b) Unit
Unit can be determined by multiplier of electric energy (Un\G100), as shown below.
(c) Update timing
It will be updated every measuring cycle (250 ms).
n
(Multiplier is n).
-3
Electric energy, multiplier of
the reactive energy
(Un\G100)
-5
-4
-3
-2
-1
Unit
×10 -5 kWh
×10 -4 kWh
×10 kWh
-3
×10 -2 kWh
×10 -1 kWh
6 – 15
QE81WH