Rockwell-automation 1771-SPI,D17716.5.122 SPI PROTOCOL INTERFACE Instrukcja Użytkownika Pobierz pdf (Strona 25)

Defining Command and Status Blocks

Chapter 3

3-3

Table 3.B

Word/Bit

Definitions of the Module Configuration Command Block (MCC)

Word

Number

Bit

Number

Title Range / Description

0-7 Block ID 11111111 MCC block ID

8 Data Format

0 = decimal data (required for PLC5) Note: Determines the format of device ID

1 = do not use (for other processors) and addresses for ALL data blocks

9-10 Numeric Format

00 = floating point Note: Determines numeric format for ALL

01 = decimal data (preferred) data blocks

Cmd not Supported

CNS

0 = SPI module reports Command not Supported errors from all devices

1 = SPI module does NOT report these errors

12-14 Baud Select Bits 14 13 12 Baud

0 0 0 1200 Note: Determines the SPI module's

0 0 1 2400 communication rate with ALL devices

0 1 0 4800 on the SPI network

0 1 1 9600

1 0 0 19200

15 Cmd not Executed

CNE

0 = SPI module reports Command not Executed errors from all device.

1 = SPI module does NOT report these errors

0-3 Number of

MCC pages

0 = one page Note: If the MCC requires more than one page, download pages in

9 = 10 pages numeric order. Last page must match page number (bits 47).

4-7

Page Number 0 = page 1 Note: If the MCC requires more than one page, your ladder logic

9 = page 10 must toggle these bits to identify each successive page number.

8-15 Not used zero

3 and 4 Not used zero

Each pair of words below defines a device on the SPI network.

The SPI module will poll them in listed order. You may repeat a device for more frequent polling.

0-7 Device Type The 8bit code defines the device type. See Table 3.N

8-12 Reserved

Protected Mode

0 = not used Note: Tells the SPI module to use the protected

1 = Use machine protected mode machine mode word: Poll 20 4A and Select 20 4B

14 Configuration

Select

0 = not used Important: Tells the SPI module that:

1 = Use custom configuration * this device will be configured by a custom CCB.

* data will be sent to it by CDB.

15 Device Select

0 = normal BTR of status Note

Disable removes the device from the SPI net

1 = disable BTR reporting work queue. Lets you read other devices selectively

0-7 Device Address 32-255 (decimal data) Note: Use the address that you selected

with switches on the device.

8-15 Zone Address 48-255 (decimal data) Note: If the device has multiple temperature zones,

use assigned zone addresses. If not, zero the digits.

Use word pairs 7 & 8, 9 & 10, 11 & 12, up to 63 & 64 as needed for multiple devices on the SPI network.

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 61 62

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