Eaton Electrical PROFIBUS-DP EZ204-DP - Manual (Page 98)

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EZ800/EZD Control Commands
MN05013001E 94
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.
The following tables show the different control commands
possible. These essential control commands fall into three
essential categories – real-time clock, image and function
blocks.
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
J
In order to use input/output data and control commands
simultaneously:
Only after the “Control commands” data exchange has
been completed, will the I/O data be refreshed.
All specified commands and parameters must be
transferred in hexadecimal format.