Rockwell Automation 1771-SPI,D17716.5.122 SPI PROTOCOL INTERFACE - Manual (Page 33)

Defining Command and Status Blocks
Chapter 3
3-11
Table 3.J
Bit/Word Definitions of Custom Configuration Status (CCS)
Word
Number
Bit
Number
Title Range SPI Module:
0-7 Device ID 00100000 to 11111110 mirrors the SPIĆspecified device ID.
1
8-10
Determine
Configuration
DC
(IDĆspecific)
100 = Store configuration >>
101 = Read configuration >>
110 = Overwrite configuration >>
111 = Clear configuration >>
If device ID matches a stored ID, SPI returns an error.
If SPI finds no matching ID, it returns an error.
If SPI finds matching ID, new config overrides old.
SPI returns a flag, and ignores all other data in CCB.
1
11
Clear All
CA
0 = No action
1 = Clear all configurations
mirrors the CA command
12
Command Executed
CE
0 = SPI module detected an error
1 = SPI executed the command
sets this bit to tell the PLC processor that the custom
configuration block (CCB) was stored without error.
13-15 Not used
If DC (Determine Configuration) bits 8Ć10 above = 101 = Read Configuration, then the SPI module returns words 2 up to 64 as follows.
(If the SPI module finds no matching ID (cannot read specified configuration), it indicates an error by zeroing words 2 up to 64.)
2
0-7
Number of
BitĆcommand Words
0 to 60 decimal data mirrors the number of words containing bit commands
2
8-15
Number of
Numeric Setpoints
0 to 30 decimal data
mirrors the number of setpoints and/or alarm limits
If it detected an error, zeros this byte.
3
0-7
Number of
ASCII Strings
0 to 30 decimal data
reflects number of ASCII strings
If it detected an error, returns fault diagnostics.
3
8-15
Number of
BitĆstatus Words
0 to 30 decimal data
mirrors the number of words containing bit status
If it detected an error, returns fault diagnostics.
4
0-7
Number of
NumericĆstatus Words 0 to 30 decimal data
mirrors the number of numericĆstatus words such as
temperature. If it detected an error, zeros this byte.
4
8-15
Number of
ASCIIĆstatus Strings
0 to 30 decimal data
mirrors the number of ASCIIĆstatus strings
If it detected an error, zeros this byte.
Starting
at
8-15 CMD1 starts at 00100000 20 mirrors the SPI code pair for the specified
bit command word sent to the SPI module at
word 5 0-7 CMD2 starts at 00100010 22
bitĆcommand word sent to the SPI module.
For example: 20 49 for Mode, Machine
word
8-15 CMD1 starts at 00100000 20 mirrors the SPI code pair for the specified
numeric setpoint sent to the SPI module
word
pair
0-7 CMD2 starts at 00100010 22
numeric setpoint sent to the SPI module.
For example: 20 31 for Temperature Setpoint
word
8-15 CMD1 starts at 00100000 20 mirrors the SPI code pair for the specified
ASCII string sent to the SPI module
word
pair
0-7 CMD2 starts at 00100010 22
ASCII string sent to the SPI module.
For example, 20 22 for SPI Revision
word
8-15 CMD1 starts at 00100000 20 mirrors the SPI code pair for the specified
bit status word returned to the processor
word
pair
0-7 CMD2 starts at 00100010 22
bitĆstatus word returned to the processor.
For example, 20 44 for Status, Machine
word
8-15 CMD1 starts at 00100000 20 mirrors the SPI code pair for the specified
numeric status word returned to the processors
word
pair
0-7 CMD2 starts at 00100010 22
numeric status word returned to the processors.
For example, 20 72 for Process Temperature
word
8-15 CMD1 starts at 00100000 20
mirrors the SPI code pair for the specified word
pair 0-7 CMD2 starts at 00100010 22
mirrors the SPI code pair for the specified
ASCII status word returned to the processor.