Rockwell-automation 1775-MX_S4A,D17756.3.1 User Manual PLC-3 BACKUP CO Manual de usuario descargar pdf (Pagina 94)

Programming Techniques

Chapter 5

5-13

1775MX Module Communication

If the PLC-3 backup system uses memory communication modules, there

are additional bits in the data table status section (file 4, word 0) to indicate

communication status between memory communication modules. Status

information for the memory communication module resides in file 4,

words 0, 1, and 2 of the data table status section. You can monitor the

operation of a memory communication module by examining the contents

in word 0 of status file 4 (S4:0). Figure 5.5 and Table 5.B show the

meaning of each bit of this word.

Figure 5.5

Status

Information for the Memory Communication Module

Transmissions occurring

Backup to primary data

xfer enabled

LIST/program control

Program compare fail

Program compare done

Program compare enabled

Data table file xfer

Continuous/single xfer

Backup in RUN mode

Backup in TEST mode

Backup in PROGRAM mode

Backup faulted

Backup outputs enabled

Backup locked

Primary locked

Communications error

17161514131211100706050403020100

Status File 4, Word 0 in the Data Table

10984I

Important: Bit 17 preconditions bits 15 and 16.

1775MX Module Program Compare

If an error occurred while executing a program comparison function, you

can pinpoint the rung location by examining words 1 and 2 of status file 4.

As shown in Figure 5.6, word 1 gives you the extended address of the

miscomparison. For example, if word 1 contained the hexadecimal value

0412 then the miscomparison is located in the user program section,

current operating context 1, in a subroutine. This information was obtained

as follows:

the value 4 designates the user program section of PLC-3 memory

the value 1 designates the current operating context

the value 2 designates the subroutine program section

1 2 ... 89 90 91 92 93 94 95 96 97 98 99 ... 118 119

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