Free Communication Blocks - Omron PROFIBUS DP GATEWAY Operation Manual

K-Format Communication
3-4-4

Free Communication Blocks

Free Communication
Block Format
This behavior can be selected in CX-Profibus when configuring the PROFI-
BUS DP Master unit, see the example in the figure below.
This setting can be defined for every individual Temperature Controller and
will be sent to the PRT1-SCU11 as part of the PROFIBUS DP Set_Prm mes-
sage.
For the K-Format protocol one Free Communication Block is available, which
has however, a different format as compared to the Free Communication
Block for Compoway-F. The one Free Communication block allows implemen-
tation of Read, Write and special Operation type of commands.
The Free Communication block reserves 3 words of input data and 3 words of
output data. The output format is shown below.
Device Reserved
address
1 byte 1 byte
The table below lists the message parameters.
Message parameter
Device address The address number of the target device.
Reserved A reserved byte, which will be ignored by the PRT1-SCU11
Command type A command type code
1 = Read command
2 = Write command
3 = Special command
4 ~ FF = Invalid command
Parameter Number / Refer to the E5AK / E5EK Operation Manual.
Command Code
In case the Command type is set to 1 or 2, use the Parameter
number to specify the parameter to be read or written.
In case the Command type is set to 3, use the Command
code to define the Special Operation.
Data Data to be written. The PRT1-SCU11 will ignore this part in
case of a Read command or a special operation command.
The input format is shown below.
Command Parameter Number/
type Command code
1 byte 1 byte
Description
Section 3-4
Data
2 byte
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