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42 Texas Instruments Communication Driver Manual

TI 305 Series Word and Bit References

Texas Instruments 305 PLCs use octal word addresses. The Operator Station format default is U16.

The following is the format for a register reference.

[XY]

X Memory type (AC and R - for 325 and 330 models)

Y Word address (leading zeroes not required)

Note: The Data Register (R) is 8-bits with this format.

The following is the format for a 16-bit data register reference.

[W:RY]

W Designating 16-bit word reference

: 16-bit designator/address separator

R Data register specifier

Y Word address

To reference a byte value, the memory address must be on an 8-bit boundary. The following is the

format for an 8-bit (byte) reference

[B:XY]

B Designating byte reference

: Byte designator/byte address separator

X Memory type (IO, T, TC, C, and SG)

Y Byte address

Note: Write restrictions that apply to each bit memory type also apply to the byte references. Byte

IO370 is read only.

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Siemens SIMATIC TI505 Wartungshandbuch Seite 45