Eaton Electrical PROFIBUS-DP EZ204-DP - Manual (Page 48)

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Control commands for EZ700
MN05013001E 44
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 – Toggle byte
Byte 0 is used to activate the sending of a control command
with the toggle function.
Procedure
X
To send a command, bit 7 must be toggled, i.e. set either
from 1 to 0 or from 0 to 1.
X Then 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.
X Do 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.
Byte 0 Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6 Byte 7 Byte 8
Bit 7 6 5 4 3 2 1 0
01
hex
/861
hex
0/1 0 0 0 0 0 0 1
Toggle bit
fixed