Setting To Wait Cyclic Data Receive After System Switching - Mitsubishi Electric MELSEC iQ-R Series User Manual

Setting to wait cyclic data receive after system switching

When system switching occurs in the redundant line structure of CC-Link IE Field Network, set this item to start the execution
of the program in the new control system with new cyclic data obtained after system switching.
Before enabling the setting to wait cyclic data receive after system switching, check the versions of the CPU
module, CC-Link IE Field Network module, and engineering tool used. ( Page 747 Added and Enhanced
Functions)
When this setting is enabled, the execution of the program is suspended until new cyclic data is received in the new control
system after system switching.
System switched
System switching
processing
New control system
...
CPU module
CC-Link IE Field
...
Network module
(1) After system switching has been completed, the CPU module stands by until it is notified of the completion of the cyclic data receipt after system switching
by all CC-Link IE Field Network modules on the main base unit.
(2) When the CC-Link IE Field Network modules receive cyclic data from the remote I/O station after system switching, the CC-Link IE Field Network modules
notify the CPU module of the completion of the cyclic data receipt.
(3) When notified of the completion of the cyclic data receipt by the CC-Link IE Field Network modules, the CPU module executes link refresh (receive).
(4) The CPU module executes the sequence program using the new cyclic data.
• When this setting is enabled, the extended time from the completion of system switching to the first output is added to the
cyclic data receipt waiting time. ( Page 730 Extended time until initial output after system switching (Tjo))
• This setting is executed in the new control system after system switching regardless of the operation mode (backup mode/
separate mode). This setting operates when the operating status of the CPU module in the new control system is RUN,
STOP, or PAUSE. (This setting does not operate when a stop error has occurred in the CPU module in the new control
system.)
• This setting operates when the link scan mode of the CC-Link IE Field Network is set to "Sequence Scan Asynchronous" or
"Constant Link Scan". This setting does not operate when the link scan mode of the CC-Link IE Field Network is set to
"Sequence Scan Synchronous Setting". ( MELSEC iQ-R CC-Link IE Field Network User's Manual (Application))
• When cyclic data cannot be received within the timeout time due to disconnection of the network cable or other causes
while cyclic data receipt is waited for, waiting for cyclic data receipt is stopped, and the sequence program is executed.
Occurrence of a timeout can be checked in SM1756 (wait timeout for receiving cyclic data after system switching) and
SD1756 (module information on wait timeout for receiving cyclic data after system switching).
Precautions
• Scan time monitoring with the watchdog timer is interrupted while cyclic data receipt is waited for. Thus, no error is detected
even if the scan time monitoring time has elapsed while cyclic data receipt is waited for.
• Constant scan is disabled while cyclic data receipt is waited for. Thus, no error is detected even if the constant scan setting
time has elapsed. Constant scan is enabled after waiting for cyclic data receipt has been completed, and the sequence
program is executed.
• Because device/label access service processing is not accepted while the cyclic data receipt is waited for, set the
communication timeout time with external devices in consideration of the cyclic data receipt waiting time. ( Page 731
Waiting time for cyclic data receive after system switching (Twcyc))
(1)
Waiting for receiving cyclic data
Link scan Link scan
Completion of Latest data
system switching
(3)
Link refresh
(receive)
Receive Receive
(2)
Acquisition of Acquisition of
completion completion
cyclic data cyclic data
notification notification
Link scan Link scan
26.7 Redundant System Operation Setting
(4)
Execution of sequence program
...
...
26 REDUNDANT FUNCTION
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