6 Basic System Operation
6.4.2 Register Designation Methods
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6.4.2 Register Designation Methods
Registers can be designated by direct designation of the register number or by symbolic designation. These two
types of register designation can be used together in the same ladder program. When symbolic designation is
used, the correspondence between the symbols and the register numbers must be defined. The following table
shows the register designation methods.
Designation
Type
Description
Direct Register
Number
Designation
Bit registers:
MB00100AX
Integer registers:
MW00100X
Double-length integer registers:
ML00100X
Real number registers:
MF00100X
Address registers:
MA00100X
X: For subscripts, add the subscript i or j after the register number.
Symbol
Designation
Bit registers:
RESET1-A.X
Integer registers:
STIME-H.X
Double-length integer registers:
POS-REF.X
Real number registers:
IN-DEF.X
Address registers:
PID-DATA.X
↓
Up to 8 characters
X: For subscripts, add a period (.) and then the subscript i or j after the symbol.
V
T
Direct Register Number Designation
Register number:
No.
[Bit No.] [Subscript]
When T = B (bit) (hexadecimal, 0 to F)
Register No. for V (decimal or hexadecimal)
Data type of V (T: B, W, L, F, A)
Can designate the subscript
i or j.
Type of register
Drawing: (V: S, M, I, O, C, #, D)
Function: (V: S, M, I, O, C, #, D, X, Y, Z, A)
X X X X X X X X
Symbol Designation
Symbol: [Symbol Name] [.] [Subscript]
Can designate the subscript i or j.
Alphanumeric characters or symbols
Name given to the register, 8 characters or less
Required if a subscript is to be used
(symbol name and subscript delimiter)
Alphabetic characters or symbol
(A numeral cannot be designated at the begin-
ning of a symbol name.)
