Mitsubishi Electric MELSEC iQ-R Series User Manual page 551

Precautions
This section describes the precautions for replacement/addition of extension cables (online).
■Precautions for handling extension cables
• Keep the overall cable distance within 20m in total length of extension cables. For the two extension cables connecting the
two main base units and a redundant extension base unit and for the two extension cables connecting two redundant
extension base units, extension cables with different lengths can be used. However, when connecting cables with different
lengths, calculate using the longer length.
For the precautions for handling extension cables other than those above, refer to the following.
 MELSEC iQ-R Module Configuration Manual
■Precautions for replacing or adding extension cables
• Replace one extension cable at a time, and connect the new extension cable to the same connectors as the disconnected
extension cable. When adding an extension cable, connect it to the IN and OUT connectors of the extension base units to
which another extension cable is connected. Note that the units may not operate normally if connected incorrectly.
• Do not disconnect the extension cable on the active side while replacing the extension cable on the inactive side.
Otherwise a stop error is detected in the CPU modules of both systems, and control cannot be continued.
• After the first use of the product, do not insert/remove the extension cable to/from the base unit more than 50 times.
Exceeding the limit may cause malfunction.
35 MAINTENANCE AND INSPECTION OF A REDUNDANT SYSTEM
35.2 Replacement/Addition of Extension Cables (Online)
35
549