Mitsubishi Electric MELSEC-Q Series Migration Manual page 8
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Also See for MELSEC-Q Series:
- User manual (834 pages) ,
- Reference manual (674 pages) ,
- Programming manual (624 pages)
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[Design Precautions]
WARNING
[Precautions for using PROFIBUS-DP modules]
● If a communication failure occurs with a PROFIBUS-DP network, the operating status of each station
is as follows:
(1) The DP-Master holds the input data when the communication failure occurs.
(2) If the DP-Master goes down, the output status of each DP-Slave depends on the parameter
setting of the DP-Master.
(3) If a DP-Slave goes down, the output status of other DP-Slaves depends on the parameter setting
of the DP-Master.
Check the diagnostic information and configure an interlock circuit in the program to ensure that the
entire system will operate safely. Failure to do so may result in an accident due to an incorrect output
or malfunction.
● The assignments of I/O signals and buffer memory areas differ depending on whether the
RJ71PB91V is used as the DP-Master or a DP-Slave. Configure an interlock circuit in the program to
ensure that the program does not run with the incorrect station type.
● 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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