Yokogawa Value Series FX1000 - Manual (Page 166)

4-30
IM 04L21B01-17EN
Measured/Computed Data and FIFO Data
• The FD command is used to output the measured/computed data.
• The FF command is used to output the FIFO data.
• You can use the CB command to specify whether to output the data of measurement
channels set to skip and computation channels set to OFF.
• The ID number of the output format is 1. See “ID” in section 4.1.
• When you are using a channel that is set to Log scale (/LG1 option), the logarithmic
values are output. You can convert logarithmic values to physical values.
• About logarithmic values
The relationship between the physical value (V) and the logarithmic value (V’) is
shown below.
V = 10^(V’/1000)
V’ = 1000 × logV
However, V’ must be greater than or equal to –30000 and less than or equal to 30000,
and V must be greater than or equal to 1.00E–30 and less than or equal to 1.00E+30.
The special data of V’ (such as Skip, +Over, and –Over) may exceed 30000 or be less
than –30000. This special data is output as is. For details on the special data, see the
“Special Data Values” table on the following page.
Examples:
Physical Value (V) logV Logarithmic Value (V’)
1.00E–30 –30 –30000
2.00E–02 –1.699 –1699
2.00E+05 5.301 5301
1.00E+30 30 30000
–OVER – 0x8001
+OVER – 0x7FFF
2 byte
Number of blocks
Block 1
…
Block n
Number of bytes
2 byte
Binary data
(The binary data section on the
“Conceptual diagram” in
section 4.1.)
Number of Blocks
This is the number of blocks.
Number of Bytes
This is the size of one block in bytes.
Block
Type
…
…
Type
…
…
Year Month
Channel
…
…
Channel
…
…
Day
A2A1
…
…
A2A1
…
…
Hour
A4A3
…
…
A4A3
…
…
Min ms
Summer/
winter
Flag s
Measured data
…
…
Computed data
…
…
1 byte 1 byte 1 byte 1 byte 1 byte 1 byte 2 bytes 1 byte 1 byte
4 bits
12 bits
4.3 Output Format of Binary Data