7 Tag Data Link Functions
7-64
NJ-series CPU Unit Built-in EtherNet/IP Port User’s Manual (W506)
z 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.
z Data Processing Programming Example
• The following type of programming can be used to process data only when the data links are oper-
ating normally.
• You can use MC − MCR instructions and JMP instructions to process data only when the data
links are operating normally as shown below.
Online
(_EIP_EtnOnlineSta)
Normal Target
Node Information (#2)
_EIP_EstbTargetSta[2]
Node 2
error output
Normal Target
Node Information (#2)
_EIP_EstbTargetSta[2]
Normal Target Node Information (#1)
_EIP_EstbTargetSta[1]
Node 1
error output
Normal Target
Node Information (#1)
_EIP_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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