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1 COMMON ITEMS
1.3 MELSEC Data Link Functions
Accessing devices of the own station and of a CPU module on other stations
An interlock may be required to be provided depending on the link status of the own station and other stations.
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Access to devices on the own station
Create a user program that provides an interlock to enable reading/writing data when the following conditions are satisfied to
access devices via each network module.
Even if the above conditions are not satisfied; however, read/write processing to the own station is completed normally.
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Other station transient access (other station CPU module remote operation and device
access)
Create a user program that provides an interlock to enable reading/writing data when the following conditions are satisfied to
access devices via each network module.
Module to be routed
Condition that requires interlock
CC-Link IE Controller Network module
When the following conditions are met:
• The bits of the own station data link error status (SB49) is OFF (data linking).
• The cyclic transmission status (the bit corresponding to the communication target station which is stored from
SWB0 to B7) is OFF (normal communication).
CC-Link IE Field Network master/local
module
MELSECNET/H network module
When the following conditions are met:
• The module status (SB20) is OFF (normal).
• The bits of the own station baton pass status (SB47) is OFF (normal).
• The bits of the own station data link status (SB49) is OFF (data linking).
CC-Link module
When the following conditions are met:
• The module error (Xn0) is OFF (normal).
• 'Module READY' (XnF) is ON (activated).
• The bits of the own station data link status (Xn1) is ON (data linking).
Module to be routed
Condition that requires interlock
CC-Link IE Controller Network module
When the following conditions are met:
• The bits of the own station baton pass status (SB47) is OFF (normal).
• The baton pass status of a station to be accessed (the bit corresponding to the communication target station
which is stored from SWA0 to A7) is OFF (normal communication).
CC-Link IE Field Network master/local
module
MELSECNET/H network module
When the following conditions are met:
• The condition that turns the interlock ON is met when accessing devices on the own station.
• The baton pass status of a station to be accessed (the bit corresponding to the communication target station
which is stored from SW70 to 73) is OFF (normal communication).
• The data link status (the bit corresponding to the communication target station which is stored from SW74 to
77) is OFF (normal communication).
CC-Link module
When the following conditions are met:
• The condition that turns the interlock ON is met when accessing devices on the own station.
• The data link status of a station to be accessed (the bit corresponding to the communication target station
which is stored from SW80 to 83) is OFF (normal communication).
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