5.3
Registers
5-27
5.3.4 Register Specification Methods
Registers can be specified directly by register number or by symbol (register name) specification. A
combination of both of these register specification methods can be used in ladder programs.
When using the symbol specification method, the relationship between symbols and register numbers
must be defined.
The following table shows the register specification methods.
Specification
Method
Specification Example by Data Type
Register
number direct
specification
Bit register: MB00100AX
Integer register: MW00100X
Double-length integer register: ML00100X
Real number register: MF00100X
Address register: MA00100X
X: When specifying subscripts, subscript i or j is added after the register number.
Symbol
specification
Bit register: RESET1-A.X
Integer register: STIME-H.X
Double-length integer registers: POS-REF.X
Real number registers: IN-DEF.X
Address registers: PID-DATA
.X
　　　　　　　　　　　　　　　　↓
8 alphanumeric characters max.
X: When specifying subscripts, a period (.) is added after the symbol (8
alphanumeric characters max.) and then a subscript i or j is added.
T
V
Direct Specification of
Register Number
Register No.: No.
Bit No. Subscript
Subscript i or j can be specified
When T = B (bit register) (hexadecimal: 0
to F)
Register number allocated for V
(decimal/hexadecimal)
Register type
(DWG: S, M, I, O, C, #, or D)
(Function: S, M, I, O, C, #, D, X, Y, Z, or A)
Data type allocated by V (B, W, L, F, or A)
X XXXXXXX
Symbol:
Symbol name
Subscript
Subscript i or j can be specified
Required if using subscripts
Alphanumeric characters or symbols
English characters or symbols
(Symbol names cannot start with numerals.)
Name for registers: 8 characters max.
Symbol
Specification
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