Rockwell-automation 1771-SPI,D17716.5.122 SPI PROTOCOL INTERFACE Manual de usuario descargar pdf (Pagina 44)

Creating Command and Status Blocks

Chapter 4

4-8

You must create a CDB to send data to the device.

The purpose of this worksheet is to help you enter values into the words

that you defined in the CCB. We help you define:

data layout of the CDB

bit status of bit-command words

values of numeric preset words

ASCII strings

Important: Your entries in this CDB must match those entries for

command words (to be sent to the device) that you specified in the CCB,

entry for entry, in the same order, with no blank words.

Important: This example matches the CCB for the dryer that we

previously described.

Example CDB Worksheet

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

1 device ID: 22 (Dryer) Enter the device type ID.

2 device address: (what you set with switches on the device) Enter 2digit device address.

3 & 4 zero

5 bit command 1 0000 0000 0000 000x

0 = machine off, 1 = machine on

Set specified bits in each

bitcommand word. [1]

6, 7 numeric preset 1 490

F (temperature setpoint in TCS)

Enter preset values,

two words per preset

8, 9 numeric preset 2 30

F (Hitemp deviation alarm, TCS)

two words per preset.

Use second word of pair for

floating point numbers

10, 11 numeric preset 3 30

F (Lotemp deviation alarm, TCS)

floatingpoint numbers.

Otherwise, leave it zero. [1]

pair ASCII 1 not used in this example Enter ASCII strings,

two words per string. [1] [2]

[1] Y

our CDB entries here must match identically the command codes you entered in the CCB:

entry for entry, in the same order

, with no blank words

[2] One character per byte, four characters maximum.

Important: The SPI module returns status from the target device in the

device’s Custom Data Status (CDS).

Custom Data Block, CDB, to

Transfer Data to the Device

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 61 62

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