Control commands for EZ700
The master initiates the data exchange of the control commands and the addressed slave responds.
During communication 9 data bytes (byte 0 = toggle byte, bytes 1 to 8 information bytes) are sent via PROFIBUS.
The basic telegram structure is shown in the following diagram.
Byte 0 Byte 1
Byte 2
Byte 3 Byte 4 Byte 5 Byte 6 Byte 7 Byte 8
Byte 0 – Toggle byte
Byte 0 is used to activate the sending of a control command with the toggle function.
Bit | 7 |
|
01hex/861hex | 0/1 |
|
| Toggle bit |
|
|
|
|
6 |
| 5 |
| 4 |
| 3 |
| 2 |
| 1 |
| 0 |
0 |
| 0 |
| 0 |
| 0 |
| 0 |
| 0 |
| 1 |
|
|
|
|
|
|
|
|
|
|
|
|
|
fixed
Procedure
XTo send a command, bit 7 must be toggled, i.e. set either from 1 to 0 or from 0 to 1.
XThen poll the toggle bit for the coupling modules response until it has the same status as the toggle bit sent. This status indicates to the master that the response to the sent command is valid.
XDo not send a new command until you have received a response (changing of the toggle bit), otherwise the response of the previous command will be overwritten before it can be read.
44 | For more information visit: www.EatonElectrical.com | MN05013001E |
