Checking The System Configuration In A Redundant System With Redundant Extension Base Unit; Sd Memory Card - Mitsubishi Electric MELSEC iQ-R Series User Manual

Checking the system configuration in a redundant system with
redundant extension base unit
The redundant system configuration between both systems is checked in the following cases.
• At power-on or reset
• At tracking cable connection
Checking the module configuration between both systems
If at least one of the following conditions is different between both systems at power-on or reset, a stop error occurs.
• Main base units with the same number of slots are used in both systems.
• The mounting status of each slot of the main base units and the model names of the mounted modules are the same in
both systems. However, for a slot set to be empty in the module status setting under the I/O assignment setting for system
parameters, no error occurs even if the module model names are not the same.
• The I/O Assignment Settings for the system parameters are the same in both systems.
• If a stop error is detected when both systems are simultaneously powered on or reset, a stop error occurs in
both systems.
• When the standby system is turned on or reset while the control system is operating, a stop error occurs in
the standby system. While the online module change process is performed in the control system, the
mounting status of each slot is different, but a stop error does not occur.
Checking the extension cable connection between both systems
If the main base units are not connected to the same redundant extension base unit, a stop error occurs at the following
timing.
• At power-on or reset
• At tracking cable connection
• If a stop error is detected when both systems are simultaneously powered on or reset, a stop error occurs in
both systems.
• When the standby system is turned on or reset while the control system is operating, a stop error occurs in
the standby system.
• When the tracking cable is connected in the condition where no tracking cable is connected, a stop error
occurs in the standby system.

SD memory card

Whether the insertion status of an SD memory card and the status of the write protect switch are the same between the
control system and the standby system is checked. The type and capacity of an SD memory card is not checked.
The insertion status of an SD memory card is checked even when only the standby system is powered off and
on or reset while the control system is operating. When an SD memory card is used, it is recommended to
remove it only when necessary.
When a mismatch is detected
A stop error occurs in the CPU module of the standby system. If a stop error is detected when both systems are
simultaneously powered on or reset, a stop error occurs in the CPU module of the control system as well.
26 REDUNDANT FUNCTION
26.5 System Consistency Check
26
417