Rockwell-automation 1772-LP3 PLC - 2/30 Programmable Controller Progra Manual de usuario descargar pdf (Pagina 45)

100

101

Data Table

Chapter 3

318

If a bit is off (0), its corresponding output device is off (de-energized).

Output image table bits are controlled by user program instructions.

Instruction addresses in the input/output (I/O) image tables take the form

of Figure 3.5. These addresses have a dual role. Each 5-digit address

corresponds (1) to an input or output table word (address) and (2) to a

hardware location.

Figure 3.5 shows how the 5-digit address corresponds to an input or output

table word. The first 3 digits define the function and logical address of a

single, 16-bit input or output image table word. The remaining two digits

represent a specific bit in that I/O table word.

Figure 3.6 shows how the 5-digit address corresponds to an input or output

module terminal. Using the same 010/12 address, the first 3 digits again

define the logical function and address of a specific I/O group. The

remaining two digits represent a specific input or output terminal in that

I/O group.

NOTE: See Appendix A, Hardware Addressing, for a complete

presentation on the relationship between specified hardware terminals and

their I/O image table addresses.

3.3.2

Instruction Address

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 345 346

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Rockwell-automation 1772-LP3 PLC - 2/30 Programmable Controller Progra Manual de usuario Pagina 45

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