Omron PROFIBUS DP GATEWAY Operation Manual page 58

Compoway-F Communication
Handshaking
Operation Execute Word
15 14 13 12 11 10 9
An overview of all the Command Codes, Channel Numbers and Error Codes
is given in the table below.
Bit group Binary
Value
name
Command 0000
code
0001
0010
0011
0100
0101
0110
0111-1111
Channel 000
numbers
001
010
011
100-110
111
Error code, 0
one bit
1
In order to prevent an overflow of commands being sent to one or more
devices, the user must implement a simple handshaking mechanism in the
PROFIBUS DP Master unit.
• When no command is to be sent to a device, set the Special Operation
Word in the PROFIBUS DP Master to 0. The PRT1-SCU11 will respond
by setting the Operation Execute word to 0.
• When a command must be sent to a device, set the Command Code and
the Channel Number. For another Special Operation command to be
sent, the user must first wait for the Operation Execute word to change to
a non-zero value, indicating the completion of the first Special operation
command.
8 7 6 5 4 3 2 1
Value description
Clear command
Run
Stop
AT Cancel
AT Execute
Auto
Manual
Reserved
Channel 1
Channel 2
Channel 3
Channel 4
Not supported
All channels
No error
Error
• Not supported command number
• Not supported channel number
• Command execution failed
• Communication with Temperature Controller fails
Section 3-3
0
Command Code
Error
Channel Number
43