Rockwell-automation 1771-SPI,D17716.5.122 SPI PROTOCOL INTERFACE Manual de usuario descargar pdf (Pagina 38)

Creating Command and Status Blocks

Chapter 4

4-2

Use this worksheet for the MCC to write down:

data format of all addresses and data

communication rate of the SPI link

number of pages of the MCC (above 1 page of 64 words)

queue order in which the SPI module will poll devices on the link

device ID and address code of devices in the polling queue list

Example MCC Worksheet

Word Write your entry in this column. (example in italics) Notes

1 link baud = 9600

address format = integer numeric format = integer

Enter this data by setting bits.

See MCC in chapter 3.

2 # of MCC pages above 1 = 0 One MCC page = 64 words.

34 zero

5 & 6 1st device Dryer ID = 22 (00100010) Addr = 20

Polling Order:

Enter types of devices ID and

7 & 8 2nd device GP Temp Controller ID = 27 (00100111) Addr = 21

Enter types of devices, ID and

address codes in the order

9 & 10 3rd device Melt Pump ID = 24 (00100100) Addr = 22

address

codes

the

order

you want them polled.

11 & 12 4th device Loader ID = 23 (00100011) Addr = 23

You may enter the same

device more than once if you

want it polled more frequently.

last pair

63, 64

SYS returned? no SYS returned after polling Enter SYS if you want SYS

returned to the processor after

each polling sequence.

Module Configuration

Command Block, MCC, to

Configure the SPI Module

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 61 62

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Rockwell-automation 1771-SPI,D17716.5.122 SPI PROTOCOL INTERFACE Manual de usuario Pagina 38