Precautions For The Redundant Extension Base Unit Configuration - Mitsubishi Electric MELSEC iQ-R Series User Manual

Precautions for the redundant extension base unit configuration

This section describes the precautions on programming in the redundant extension base unit configuration.
Dedicated instruction
Dedicated instruction cannot be used for modules mounted on the extension base unit. An error occurs if the dedicated
instruction is executed. Note that the error can be set as a continuation error in the CPU module operation setting for error
detection under the RAS setting of the CPU parameter. ( Page 204 CPU module operation upon error detection setting)
Module label
When using a module label for a module mounted on the extension base unit, transfer the tracking data of the module label
(extension base unit). ( Page 388 Tracking Transfer)
Module function block
In the module function block for a module mounted on the extension base unit, do not use a module function block that uses
dedicated instructions. When using a module function block that does not use dedicated instructions, transfer the tracking
data of the module label (extension base unit). ( Page 388 Tracking Transfer)
When using input values in the program
When the following devices/labels are used in the program, the values of the old control system are inherited even after
system switching. Therefore, transfer the tracking data.
• Input devices (X)/labels assigned to a module on the extension base unit
• Devices/labels where automatic refresh settings are made for the intelligent function module on the extension base unit
• Devices/labels where automatic refresh settings are made for the CC-Link module on the extension base unit
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26.11 Precautions on Programming