Rockwell-automation 1771-SPI,D17716.5.122 SPI PROTOCOL INTERFACE Instrukcja Użytkownika Pobierz pdf (Strona 35)

Defining Command and Status Blocks

Chapter 3

3-13

CDS Resulting from CDB

The SPI module responds to CDB commands by reflecting the CDB back

to the PLC processor as the CDS (Table 3.L):

Table 3.L

Custom

Data Status (CDS)

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

1 0 CR CE 0 DC Device Identification

2 Zone Address Station Address

3 Diagnostic Word: If the SPI module detects a fault, it sets an error code to help identify the cause of the fault

4 0 0 0 0

starting at 5,

up to 64

If no communication fault, reflects all the commandcode pairs that you entered in CCB. Reports zero for a fault.

Table 3.M

Bit/Word

Definitions for Custom Data Status (CDS)

Word

Number

Bit

Number

Title Range

07 Block ID

00100000 to 11111111

810

Determine

Configuration

000= Standard Configuration

001 = Custom Configuration

010 = Random Data Configuration

011 = Random Data Open Config

100 = Store Configuration

101 = Read Configuration

110 = Overwrite Configuration

111 = Clear Configuration

11 Reserved

zero

Command Executed

Bit 12 = 0 - Command not executed

Bit 12 = 1 - Command executed

Command

Response CR

Bit 13 = 0 - response to a queued read

Bit 13 = 1 - response to a CDB

1415 Reserved zero

07 Station Address

32 to 255 decimal data

815

Zone Address

(temperature control)

48 to 255 decimal data

3 015 Diagnostic Word error code if SPI module detected a fault

4 Not used zero

up to 64

015 or

032

Reflected command,

specified status, or

zero

For a CDB, reflects the commandcode pair.

For a polling sequence, returns specified status.

For a fault, clears the word.

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 61 62

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