Mitsubishi Electric MELSEC iQ-R Series User Manual page 6

[Design Precautions]
WARNING
● If a stop error occurs in the CPU module, the operating status of the DP-Master is as follows.
In a redundant system, however, the operation is the same as when "CPU Error Output Mode Setting"
is set to "Hold" regardless of its setting value.
(1) When "CPU Error Output Mode Setting" is set to "Clear"
• I/O data exchanges with DP-Slaves are interrupted.
• Output data in the buffer memory of the DP-Master are cleared and not sent.
• Input data which have been received from DP-Slaves when a stop error occurs in the CPU
module are held in the buffer memory of the DP-Master.
(2) When "CPU Error Output Mode Setting" is set to "Hold"
• I/O data exchanges with DP-Slaves are continued.
• Output data which have been stored in the buffer memory of the DP-Master when a stop error
occurs in the CPU module are held and sent to DP-Slaves.
• Data in the buffer memory of the DP-Master are updated with input data received from DP-
Slaves.
● If a stop error occurs in the CPU module, the operating status of DP-Slaves is as follows:
(1) When "CPU Error Output Mode Setting" is set to "Clear"
• Input data to be sent from DP-Slaves to the DP-Master are cleared.
• Output data which have been received from the DP-Master when a stop error occurs in the
CPU module are held in the buffer memory of DP-Slaves.
(2) When "CPU Error Output Mode Setting" is set to "Hold"
• Input data to be sent from DP-Slaves to the DP-Master when a stop error occurs in the CPU
module are held.
• Output data which have been received from the DP-Master when a stop error occurs in the
CPU module are held in the buffer memory of DP-Slaves.
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