Rockwell Automation 1771-SPI,D17716.5.122 SPI PROTOCOL INTERFACE - Manual (Page 27)

Defining Command and Status Blocks
Chapter 3
3-5
Table 3.D
Word/Bit Definitions of the System Status Block (SYS)
Word
Number
Bit
Number
Title
Range / Description
0-7 Block ID 11111111 SYS block ID Mirrors the MCC
when the entry is valid.
8 Data Format
DF
0 = decimal data Mirrors the MCC
when the entry is valid.
9-10 Numeric
Format
NF
00 = floating point Mirrors the MCC
01 = decimal data when the entry is valid.
1
11 Command not
Supported
CNS
0 = SPI module reports Command not supported errors.
1 = SPI module does NOT report these errors. Mirrors the MCC
when the entry is valid.
12-14 Baud Select Bits 14 13 12 Baud
0 0 0 1200
0 0 1 2400 .
0 1 0 4800 Mirrors the MCC
0 1 1 9600 when the entry is valid.
1 0 0 19200
15 Power Up
PU
0 = expecting MCC block, or invalid MCC Note: Tells the processor that the SPI
1 = MCC block stored OK module stored a valid MCC block.
0-3 Number of
MCC pages
0 = one page Mirrors the MCC
9 = 10 pages when the entry is valid.
2 4-7 Page Number 0 = page 1 Mirrors the MCC
9 = page 10 when the entry is valid.
8-15 Device Type returned with word 3 for invalid entry in the MCC polling queue list, or zero if MCC is OK
3
all
Diagnostic
Word
returned to help you diagnose an invalid MCC, or zero if MCC is OK
4
0-7 Device Address returned with word 3 for invalid entry in the MCC polling queue list, or zero if MCC is OK
4
8-15 Zone Address returned with word 3 for invalid entry in the MCC polling queue list , or zero if MCC is OK
5 thru 18 all
SPI Network
(OK)
0 = device inactive on SPI network Note: One bit per device starting with
1 = communication is OK word 5 bit 00 = device address 32 up to
word 18 bit 15 = device address 255