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FX3S/FX3G/FX3GC/FX3U/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
4 Devices in Detail
4.9 Data Register and File Register [D]
4.9 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).
Two data registers combined or file registers can store 32-bit numeric data (whose most significant bit specifies the
positive or negative sign).
→ For the functions and operations of file registers, refer to Subsection 4.9.4.
4.9.1 Numbers of data registers and file registers
The table below shows numbers of data registers and file registers. (Numbers are assigned in decimal.)
1. FX3S PLC
2. FX
3G/FX3GC PLCs
3. FX
3U/FX3UC PLCs
*1. Data registers D1000 and later can be used as file registers in units of 500 points by setting parameters.
*2. These registers can be changed to the latched type by the parameter setting when the optional battery is
used. However, the latched range cannot be set.
*3. This area is not latched (battery backed). It can be changed to the latched (battery backed) area by setting
parameters.
*4. This area is latched (battery backed). It can be changed to the non-latched (non-battery-backed) area by
setting parameters.
*5. The latch (battery backup) characteristics cannot be changed using parameters.
When N : N Network or parallel link is used, some data registers are occupied for the link.
→ Refer to the Data Communication Edition.
Data registers
File registers
(latched (EEPROM
keep) type)
General type
Fixed latched
(EEPROM keep) type
General type Special type
D0 to D127
128 points
D128 to D255
128 points
D256 to D2999
2744 points
D8000 to D8511
512 points
D1000
*1
and later
2000 points maximum
Data registers
File registers
(latched (EEPROM
keep) type)
General type
Fixed latched
(EEPROM keep) type
General type Special type
D0 to D127
128 points
D128 to D1099
972 points
D1100 to D7999
6900 points
*2
D8000 to D8511
512 points
D1000
*1
and later
7000 points maximum
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
D0 to D199
200 points
*3
D200 to D511
312 points
*4
D512 to D7999
7488 points
*1*5
D8000 to D8511
512 points
D1000
*1
and later
7000 points maximum