Rockwell Automation 1771-SPI,D17716.5.122 SPI PROTOCOL INTERFACE - Manual (Page 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
DF
0 = decimal data (required for PLCĆ5) Note: Determines the format of device ID
1 = do not use (for other processors) and addresses for ALL data blocks
9-10 Numeric Format
NF
00 = floating point Note: Determines numeric format for ALL
01 = decimal data (preferred) data blocks
1
11 Cmd not Supported
CNS
0 = SPI module reports Command not Supported errors from all devices
1 = SPI module does NOT report these errors
1
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 4Ć7).
2 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 8Ćbit code defines the device type. See Table 3.N
8-12 Reserved
5 13 Protected Mode
PM
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
CS
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
DS
0 = normal BTR of status Note: Disable removes the device from the SPI netĆ
1 = disable BTR reporting work queue. Lets you read other devices selectively
6
0-7 Device Address 32-255 (decimal data) Note: Use the address that you selected
with switches on the device.
6
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.