Rockwell-automation 1769-ASCII Compact Module Manual de usuario descargar pdf (Pagina 16)

16 Compact 1769-ASCII Module

Publication

1769-IN068B-EN-P - May 2005

I/O Memory Mapping

The 1769-ASCII module supports an input assembly that is accessible

through the Assembly Object (Class 4), Instance 101. The input assembly is

up to 108 words. The module supports an output assembly that is accessible

through the Assembly Object (Class 4), Instance 100. The output assembly is

up to 108 words.

Alternate Mode (One Channel at a Time) Output File

Maximum size is shown below. Refer to the Compact I/O 1769-ASCII

Module User Manual, publication 1769-UM012, to use smaller output files.

• Tx = Transmit

• Rx = Receive

• CN

I = Channel number of requested input data. This bit is set by the

PLC controller or other user program to tell the ASCII module which

data to produce.

Word

Bit Position

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

0 Reserved Tx Transaction ID Ch0

1 Reserved Rx Transaction ID Request Ch0

2 Reserved Tx Transaction ID Ch1

3 Reserved Rx Transaction ID Request Ch1

4 Reserved CNI

5 Reserved CNO

6 Reserved

7 Length (Number of Bytes)

8 Character 1 Character 0

9 Character 3 Character 2

… Character … Character …

106 Character 197 Character 196

107 Character 199 Character 198

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 39 40

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Rockwell-automation 1769-ASCII Compact Module Manual de usuario Pagina 16