Rockwell-automation 1771-SPI,D17716.5.122 SPI PROTOCOL INTERFACE Manuel d'utilisateur télécharger pdf (Page 48)

Creating Command and Status Blocks

Chapter 4

4-12

Use this SYS bit/word map to identify:

data layout of the SYS

location of the diagnostic word to describe detected MCC errors

location of invalid device ID and/or device address

number of bits in word 5 to indicate “device OK” on link (in last row)

We identify fault diagnostic information in bold print.

SYS Bit/Word Map

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

1 PU

[ 1 ]

Baud Select

[ 2 ]

SYS Block ID

[ 2 ]

2 Device ID (returned for an invalid entry in MCC polling list) Page Number Total Pages

3 Diagnostic Word (Returned for an invalid MCC. See 9000 series error codes in chapter 6.)

4 Zone Address for temperature control devices, only

(Returned for an invalid entry in MCC polling list.)

Device Address

(Returned for an invalid entry in MCC polling list.)

Communication Status Bits (OK Bits) for Devices on the SPI Network

5 Devices 3247 indicated by word 5, bits 0015 (1 bit per device)

6 Devices 4863 indicated by word 6, bits 0015 (1 bit per device)

: : :

18 Devices 240255 indicated by word 18, bits 0015 (1 bit per device)

[ 1 ] Power Up bit 0 = no MCC, or invalid MCC [ 2 ] Mirrors the same MCC bit

1 = SPI module stored a valid MCC

Important: The SPI module returns the SYS after your program downloads

the MCC. For diagnostic data returned in SYS word 3, refer to chapter 6,

Troubleshooting. The return of SYS after each polling sequence is optional.

System Status Block, SYS

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 61 62

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Rockwell-automation 1771-SPI,D17716.5.122 SPI PROTOCOL INTERFACE Manuel d'utilisateur Page 48