Mitsubishi Electric MELSEC FX3U - Data Register and File Register [D]; Numbers of Data Registers and File Registers

131
FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
4 Devices in Detail
4.9 Data Register and File Register [D]
1
Introduction
2
Overview
3
Instruction List
4
Devices in Detail
5
Specified the Device & Constant
6
Before Programming
7
Basic Instruction
8
FNC00-FNC09 Program Flow
9
FNC10-FNC19 Move & Compare
10
FNC20-FNC29 Arith. & Logic Operation
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). Combined two data registers 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. FX3U/FX3UC PLC
2. FX
3G PLCs
*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 computer link PCs or parallel link is used, some data registers are occupied for the link.
→ 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
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
Data registers
File registers
(latched (EEPROM
keep) type)
General type
Latched type
(EEPROM keep)
General type Special type
D0 to D127
128 points
D128 to D1099
972 points
D1100 to D7999
6900 points
*5
D8000 to D8511
512 points
D1000
*4
and later
7000 points maximum