Explanation Of Devices; Devices And Device Numbers; Device List - Mitsubishi Electric MELDAS 60 Series Programming Manual

5. Explanation of Devices

5.1 Devices and Device Numbers

The devices are address symbols to identify signals handled in PLC. The device numbers are serial
numbers assigned to the devices. The device numbers of devices X, Y and H are represented in
hexadecimal notation. The device numbers of other devices are represented in decimal notation.

5.2 Device List

Device
X* X0~XABF (2752 points)
Y* Y0~YDEF (3584 points)
M M0~M8191 (8192 points)
F F0~F127
L L0~L255
SM* SM0~SM127 (128 points)
T T0~T15
T16~T95
T96~T103 (8 points)
C C0~C23
D D0~D1023 (1024 points)
R* R0~R8191 (8192 points)
Z Z0~Z1
N N0~N7
P* P0~P255
K K-32768~K32767
K-2147483648~
K2147483647
H H0~HFFFF
H0~HFFFFFFFF
(Note 1) The applications of the devices having a * in the device column are separately determined.
Do not use the undefined device Nos., even if they are open.
(Note 2) When using temporary memory such as M device, separate READ and WRITE every 8bits.
Device No.
(128 points)
(256 points)
(16 points) 1 bit or 16 bits
(80 points) 1 bit or 16 bits
1 bit or 16 bits
(24 points) 1 bit or 16 bits
16 bits or 32 bits Data register for arithmetic operation
16 bits or 32 bits File register. R500 to R549 and R1900 to
(2 points)
(8 points)
(256 points)
Unit
1 bit Input signal to PLC. Machine input, etc.
1 bit Output signal from PLC.
Machine output, etc.
1 bit Temporary memory
1 bit Temporary memory, alarm message
interface
1 bit Latch relay (backup memory)
1 bit Special relay
10ms unit timer
100ms unit timer
100ms unit integrating timer
Counter
R2799 are released to the user for interface
between the PLC and controller. R1900 to
R2799 are backed up by the battery.
16 bits Index of D or R address (±n)
— Master control nesting level
— Label for conditional jump and subroutine
call
— Decimal constant for 16-bit command
— Decimal constant for 32-bit command
— Hexadecimal constant for 16-bit command
— Hexadecimal constant for 32-bit command
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5. Explanation of Devices
Details