B-30
FX Series PLC User's Manual - Data Communication Edition
N:N Network
7 Creating Programs
7.1 Checking Contents of Related Devices
7. Creating Programs
This chapter explains how to set the N:N Network and how to create programs.
In N:N Network, pattern 0, 1 or 2 can be set according to the refresh range value. The number of used
devices varies depending on the pattern.
In N:N Network using (including) the FX
0N or FX1S Series, only pattern 0 is applicable.
7.1 Checking Contents of Related Devices
The tables below show the devices used by the N:N Network.
1. Devices for setting the N:N Network
These devices are used for setting the N:N Network. Setting these devices is essential for using N:N Network.
Device Name Description Set value
M8038
Parameter
setting
This device is a flag for setting communication parameters, and is used to
check for absence/presence of N:N Network program also.
Do not set this device to ON in the sequence program.
M8179 Channel setting
Set the channel of the communication port to be used (in the FX
3G, FX3U
and FX3UC).
When "OUT M8179" program does not exist: ch 1
When "OUT M8179" program exists: ch 2
D8176
Station number
settings
Set the station number used in the N:N Network.
Master station: 0, slave station: 1 to 7
[Initial value: 0]
0 to 7
D8177
Slave station
quantity setting
Set the total number of slave stations.
This setting is not required in PLCs working as slave stations.
[Initial value: 7]
1 to 7
D8178
Refresh range
setting
Select the desired pattern of device points used for communication.
This setting is not required in PLCs working as slave stations.
[Initial value: 0]
Only pattern 0 is applicable when a FX
0N or FX1S Series is included.
0 to 2
D8179
Number of
retries
When a response is not given even after communication is repeated the
specified number of times, it is regarded as an error.
Errors in other stations can be checked.
This setting is not required in PLCs working as slave stations.
[Initial value: 3]
0 to 10
D8180 Monitoring time
Set the time (50 to 2550 ms) for communication error in 10 ms units.
This setting is not required in PLCs working as slave stations.
[Initial value: 5]
5 to 255
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