Data Register And File Register [D]; Numbers Of Data Registers And File Registers - Mitsubishi FX3G Series Programming Manual

FX /FX /FX /FX
3G 3U 3GC 3UC
Programming Manual - Basic & Applied Instruction Edition
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).
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. FX /FX PLCs
3U 3UC
General type
D0 to D199
*1
200 points
2. FX /FX PLCs
3G 3GC
General type
D0 to D127
128 points
*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 latch (battery backup) characteristics cannot be changed using parameters.
*4. Data registers D1000 and later can be used as file registers in units of 500 points by setting parameters.
*5. 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.
When N : N Network or parallel link is used, some data registers are occupied for the link.
124
Series
→ For the functions and operations of file registers, refer to Subsection 4.9.4.
Data registers
Latched (battery backed)
type
(backed up by battery
against power failure)
D200 to D511
*2
312 points
Data registers
Latched type
(EEPROM keep)
D128 to D1099
972 points
Fixed latched (battery
backed) type
(backed up by battery
against power failure)
D512 to D7999
D8000 to D8511
*3*4
7488 points
General type Special type
D1100 to D7999
D8000 to D8511
*5
512 points
6900 points
→ Refer to the Data Communication Edition.
4.9 Data Register and File Register [D]
File registers
(latched (battery
Special type
backed) type)
*4
D1000 and later
512 points
7000 points maximum
File registers
(latched (EEPROM
keep) type)
*4
D1000 and later
7000 points maximum
4 Devices in Detail