6.2 I/O Gateway Mode Details
6.2.2 Pack Mode
6-5
6
Operating Modes and Setting Methods
6.2.2
Pack Mode
Only the output data for the I/O stations is extracted and packed into the M-III command. The
host controller stores only the output values for the stations in the M-III command.
The GW3100 reads the output values for the stations and stores them in the commands for the
stations. Basically speaking, only data I/O commands can be used in this mode.
The flow of the command and response data in Pack Mode is illustrated in the following figures.
Command Data Flow in Pack Mode
In this mode, you can also set M-II and M-III communications cycles that are not an integral
multiple of one or the other. However, if you do so, the data refresh timing may vary.
Information
Ma
s
ter
Gateway
I/O #1
I/O #2
I/O #
3
II
-
M
III
-
M
DATA_RWA
WDT
#1:
S
imple I/O
Output
s
(4 byte
s
)
Not u
s
ed.
(22 byte
s
)
CMD_CTRL
#2:
S
imple I/O
Output
s
(4 byte
s
)
#
3
: Intelligent I/O
(
3
0 byte
s
)
Command #1
Command #2
Command #
3
#1:
S
imple I/O
Output
s
(4 byte
s
)
#2:
S
imple I/O
Output
s
(4 byte
s
)
#
3
: Intelligent I/O
Output
s
(
3
0 byte
s
)