Rockwell-automation 1746-BAS BASIC LANGUAGE User Manual download pdf (Page 38)

Publication 1746-RM001A-US-P

3-16 Expressions and Operators

MTOP

Use the MTOP operator to retrieve the last valid memory address in RAM that is

available to the module. After reset, the module sizes the external memory and

assigns the last valid memory address to the system control value MTOP. The

module does not use any external RAM beyond the value assigned to MTOP. If this

value has not been changed by CALL 77, then the last valid BASIC address is

5FFFH (24575).

CBY([expr])

Use the CBY operator to retrieve data from the program or code memory address

location of the module. You cannot assign CBY a value; it can only be read. The

argument for the CBY operator must be a valid integer between 0 and 65535

(0FFFFH). If it is not a valid integer, a bad argument error occurs.

DBY([expr])

Use the DBY operator to retrieve or assign data to or from the internal data

memory of the module. Both the value and the argument in the DBY operator

must between 0 and 255 inclusive. This is because there are only 256 internal

memory locations in the module and one byte can only represent a quantity

between 0 and 255 inclusive.

Example Result

>PRINT MTOP 24575

PH0.MTOP 5FFFH

IMPORTANT

Improper use of this operator may cause a malfunction of the

module.

Example Result

A = CBY(1000)

The value in the program or code memory address location 1000 is

assigned to variable A.

IMPORTANT

Improper use of this operator may cause a malfunction of the

module.

Example Result

A = DBY(B)

The value in internal memory location B is assigned to

variable A. B must be between 0 and 255.

DBY(250) = CBY(1000)

The value in program or code memory location 1000 is

assigned to internal memory location 250.

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Rockwell-automation 1746-BAS BASIC LANGUAGE User Manual Page 38