Mitsubishi Electric MELSEC-L SSCNETIII/H User Manual page 86

(1) Procedure
When data link cannot be performed even though no failure is shown in "System Monitor", check if any error has occurred
with SSCNET III Communication Condition Monitor of MT Developer2. ( Page 77, CHAPTER 9)
84
1.
Connect GX Works2 to the head module, and open
the "System Monitor" window.
[Diagnostics]  [System Monitor]
2.
Select the module in which an error has occurred.
• When the selected module is the head module ( Page
85, Section 11.2 (1) (a))
• When the selected module is any other than the head
module ( Page 86, Section 11.2 (1) (b))