Mitsubishi Electric MELSEC iQ-R C Series Programming Manual page 18

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
CC-Link IE Controller Network module
CC-Link IE Field Network module
CC-Link IE TSN module
MELSECNET/H network module
CC-Link module
Timeout value of MELSEC data link functions
A timeout value of MELSEC data link functions represents a value of one communication processing with an access target.
The timeout detection time may be longer than the set timeout value because communication processing is performed
multiple times for some functions to use or when initially accessing the access target. In addition, when communication
processing is performed multiple times, it may take longer time than the timeout value depending on the response timing of
the access target, even if the processing is completed normally.
When initially accessing the access target, the following processes will be performed multiple times
regardless of the functions to use. Therefore, communication processing will also be performed multiple
times.
• Determining an access target
• Acquiring information for the programming controller CPU of an access target
1 COMMON ITEMS
16
1.3 MELSEC Data Link Functions
Condition that requires interlock
When the following conditions are met:
• The bit 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).
When the following conditions are met:
• The bit of the own station data link error status (SB0049) is OFF (data linking).
• The bit corresponding to the communication target station that is stored in 'Data link status of each
station' (SW00B0 to SW00B7) is OFF (normal communication).
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).
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).