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Chapter 5: Word and Bit References 41

TI 405 Series Word, Byte, and Bit References

Texas Instruments 405 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 (TMR, CNT, and V)

Y Word address (leading zeroes not required)

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 (GX, X, Y, C, S, T, CT, and SP)

Y Byte address

The following is the format for a bit referenced within a word.

[XY/B]

X Memory type (TMR, CNT, and V)

Y Word address (leading zeroes not required)

B Bit number in the range (0-17 in octal)

The following is the format for a single bit reference (device).

[XY]

X Memory type (GX, S, Y, C, S, T, CT, and SP)

Y Bit address (leading zeroes not required)

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Siemens SIMATIC TI505 Wartungshandbuch Seite 44