Rockwell-automation 1771-SPI,D17716.5.122 SPI PROTOCOL INTERFACE Uživatelský manuál stáhnout pdf (Strana 40)

Creating Command and Status Blocks

Chapter 4

4-4

You must create one CCB for each device type on the link to define:

data layout of the CCB

number of bit-command words and their command codes

number of numeric preset words and their command codes

number of ASCII string words and their command codes

same information for status (independent of data sent)

Important: To obtain command-code pairs CMD1 and CMD2 for specifying

commands and setpoints to be sent to the device and status returned from it,

refer to the SPI Communication Protocol manual or the device manufacturer.

Specify them according to your application requirements. In this example,

command words 5-8 define data to be sent to the device via the SPI module.

Status words 9-12 define data to be returned via the SPI module.

Example CCB Worksheet

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

1 device ID: name Dryer code 22 Enter the devicetype ID.

2 # numeric preset words = 3 # bitcommand words = 1

Numbers that you enter in words

24 t t h di

3 # bit status words = 2 # ASCII strings = 0

24 must match corresponding

number of entries in words 5 to end

4 # ASCII status words = 1 # numeric status words = 1

num

er o

n wor

o en

of file.

Word Write your entries in this column. CMD1 CMD2 Notes

5 bit command 1 Machine mode:

turn machine on/off

20 49 Enter names of bit commands and

their specified command codes

CMD1 and CMD2. [1]

6 numeric preset 1 Temperature Setpoint 20 31

Enter names of numeric presets

d th i ifi d d d

7 numeric preset 2 Alarm, Hitemperature Deviation 20 33

and their specified command codes

CMD1 and CMD2.

[

]

8 numeric preset 3 Alarm, Lotemperature Deviation 20 35

CMD1

CMD2

[1]

ASCII string 1 not used in this example Enter ASCII strings and command

codes CMD1 and CMD2. [1]

Word Write your entries in this column. CMD2 CMD1 Notes

9 bit status word 1 Process Status 20 40

Enter specified status codes CMD1

d CMD2 f bit t t d [1]

10 bit status word 2 Machine Status 20 42

and CMD2 for bitstatus words. [1]

11 numeric status wrd 1 Process Temperature 20 72 Enter status codes CMD1 and

CMD2 for numericstatus words. [1]

12 ASCII status word 1 Device Revision Level 20 22 Enter specified status codes CMD1

and CMD2 for ASCII status [1]

[1]

Leave no blank words between groups of entries. If not using a group, put the next group in its space.

Important: Status data (words 9-12 in this example) are returned to the

processor from the target device by the SPI module in Custom Data Status

(CDS), NOT in the Custom Configuration Status (CCS). They are

returned only as a result of the SPI module’s polling of devices on the link.

Custom Configuration Block

CCB, to Configure the SPI

Module for a Device

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 61 62

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