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7 Tag Data Link Functions
CJ-series EtherNet/IP Units Operation Manual for NJ-series CPU Unit (W495)
7-3 Ladder Programming for Tag Data Links
7
7-3-1 Ladder Programming for Tag Data Links
Programming Example to Detect Errors
The following programming can be used to check for tag data link errors for each target node. This
programming is used to detect errors only after the data links for all nodes have started normally.
Data Processing Programming Example
• The following type of programming can be used to process data only when the data links are oper-
ating normally.
Online
(*_ETNOnlineSta)
Normal Target
Node Table (#2)
*_EstbTargetSta[2]
Node 2
error output
Normal Target
Node Table (#2)
*_EstbTargetSta[2]
Normal Target Node Table (#1)
*_EstbTargetSta[1]
Node 1
error output
Normal Target
Node Table (#1)
*_EstbTargetSta[1]
Node 1 error output
Node 2 error output
Normal operation flag
Normal operation flag
Additional parts
The parts of the ladder
program that use the data
link area for the relevant
node are processed only
when the corresponding
normal operation flag is ON.
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