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10
PROGRAMMING USING MELSEC DATA LINK
FUNCTIONS
(b) Precautions for accessing to CC-Link module own station devices and other
station programmable controller devices.
When accessing via CC-Link module, provide interlocks according to the link
states of the own and other stations.
1) Access to own station device
Create a user program that provides interlocks to enable write to/read from the
own station device.
Data take effect only when the following conditions are satisfied.
• Module error (Xn0) is off (normal)
• Own station link status (Xn1) is off (in data link)
• Module ready (XnF) is on (operable)
Write to/read from the own station is terminated normally irrespective of the
above conditions.
2) Transient access to other stations (other station programmable controller CPU
remote operation and device access)
Create a user program that allows to access under the following conditions, in
addition to the interlocks for own station device access.
• Data link status of the access target station (Bits corresponding to a
communication target station of SW80 to 83, which are read from the own
station) is off (normal communication).
(c) Precautions for access to MELSECNET/H module host station devices and other
station programmable controller devices
When accessing via MELSECNET/H module, provide interlocks according to the
link status of the host station.
1) Access to host station device
Create a user program that provides interlocks to enable write to/read from the
host station devices.
Data take effect only when the following conditions are satisfied.
• Module status (SB20) is off (normal)
• Baton pass status of the host station (SB47) is off (normal)
• Data link status of the host station (SB49) is off (in data link)
Write to/read from the host station is terminated normally irrespective of the
above conditions.
2) Transient access to other stations (other station programmable controller CPU
remote operation and device access)
Create a user program that makes access when any of the following conditions
is satisfied, in addition to the interlocks for the host station device access.
• Baton pass status of the access target station (Bits corresponding to a
communication target station of SW70 to 73, which are read from the host
station) is off (normal communication).
• Data link status (Bits corresponding to the communication target station of
SW74 to 77, which are read from the host station) is off (normal
communication).
10.5 MELSEC Data Link Function Programming Flow
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