Rockwell-automation 1747-DSN DISTRIBUTED I/O SCANNER Manual de usuario descargar pdf (Pagina 24)

Chapter 3

Configuration and Programming

3–6

30 I/O Block Configuration Input Image

The 30 I/O block configuration input image consists of 32 words (two

communication status words and 30 input words). Each input word has a

corresponding I/O block address. For example, the input data for I/O block

31 (there is no I/O block 16) is located in input word 31. In addition, the bits

of each input word correspond to the inputs on the I/O block. For example,

• For I/O blocks with 8 inputs, bits 0–7 are valid.

• For I/O blocks with 10 inputs, bits 0–9 are valid.

Communication Status Words (words 0 and 16) – these bits reflect the

communication status of each I/O block.

• Bit 0 of word 0 provides the communication status of all 30 I/O blocks.

When communications with one (or more) I/O block is lost, this bit equals

0. Upon start up, this bit will be 0 until communications has been

established with all configured I/O blocks.

• Bits 1 through 15 of word 0 provide individual communications status for

the first 15 I/O blocks (words 1 – 15). When communications with an I/O

block is lost, the corresponding bit equals 0. Upon start up, these bits will

be 0 until communications has been established with each corresponding

I/O block.

• Bit 0 of word 16 is reserved.

• Bits 1 through 15 of word 16 provide individual communications status

for the remaining 15 I/O blocks (words 17 – 31). When communications

with an I/O block is lost, the corresponding bit equals 0. Upon start up,

these bits will be 0 until communications has been established with each

corresponding I/O block.

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Rockwell-automation 1747-DSN DISTRIBUTED I/O SCANNER Manual de usuario Pagina 24