Application Notes – PLCs and Devices
Important Note: The V-Memory word numbers in the above table are shown in octal. These numbers must be converted to decimal before they are entered into the DN-3000 Configuration Software. For example, if the DN-3000 is to access register V02000, the value 2000 in octal corresponds to the value 1024 in decimal. The value 1024 is then entered into the DN-3000 Configuration Software.
KOYO / PLC DIRECT / TI 305 SERIES PLCS
Registers Accessed
The DN-3000 will only access registers in the Data Area of PLC memory (R400–R577 and R700–R777) which are 8-bit registers. Because the DN-3000 will only read and write 16-bit values, it will use two consecutive 8-bit registers in the 305 Series PLCs to form a 16-bit value. The first of these consecutive registers must be located on an even boundary (i.e. R400, R402, etc.). The low order byte of the 16-bit value is located in the lowest numbered register and the high order byte is located in the highest numbered register.
When entering register numbers into the DN-3000 Configuration Software, they must be converted from octal to decimal. For example, if the DN-3000 is to access register R400 (and R401), the value 400 in octal is converted to the value 256 in decimal. This value of 256 is then entered into the DN-3000 Configuration Software.
