102
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
4 Devices in Detail
4.8 Data Register and File Register [D]
4.8
Data Register and File Register [D]
Data registers are devices for storing numeric data. File registers are handled as the initial values of data
registers.
Each data register or file register stores 16-bit data (whose most significant bit specifies the positive or
negative sign). Combined two data registers or file registers can store 32-bit numeric data (whose most
significant bit specifies the positive or negative sign).
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For the functions and operations of file registers, refer to Subsection 4.8.4.
4.8.1
Numbers of data registers and file registers
The table below shows numbers of data registers and file registers. (Numbers are assigned in decimal.)
*1.
This area is not latched (battery backed). It can be changed to the latched (battery backed) area by
setting parameters.
*2.
This area is latched (battery backed). It can be changed to the non-latched (non-battery-backed) area
by setting parameters.
*3.
The characteristics about latch (battery backup) cannot be changed using parameters.
*4.
Data registers D1000 and later can be used as file registers in units of 500 points by setting a
parameters.
When simple link between PCs or parallel link is used, some data registers are occupied for the link.
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Refer to the Data Communication Edition.
Data registers
File registers
(latched (battery
backed) type)
General
type
Latched (battery backed)
type
(backed up by battery
against power failure)
Fixed latched (battery
backed) type
(backed up by battery
against power failure)
Special type
FX
3U
/
FX
3UC
PLC
D0 to D199
200 points
*1
D200 to D511
312 points
*2
D512 to D7999
7488 points
*3*4
D8000 to D8511
512 points
D1000
*4
and later
7000 points maximum