636
37 FUNCTIONS
37.2 Tracking Transfer
Influence on tracking data due to safety cycle time
Safety cycle processing is performed at the interval of the specified safety cycle time, and the tracking transfer is performed
during the END processing. If the safety cycle time set in the parameter is shorter than the scan time, safety cycle processing
may be performed multiple times in a single scan. In such case, safety devices and safety labels immediately before the
tracking transfer are transferred to the other system as tracking data.
To transfer all data of safety cycle processing to the other system as tracking data, set a longer time than the scan time for the
safety cycle time. ( Page 582 Setting method)
When data is different between the control system and the standby system
When executing the tracking transfer, files such as program (standard/safety), FB file (standard/safety), CPU parameter
(standard/safety), global label setting (standard/safety), standard/safety shared label setting must be the same between the
CPU modules of the both systems. ( Page 637 Memory Copy from Control System to Standby System)
If there is any difference, standard global devices, safety global devices, system data, and the PID control instruction
information are transferred.
*1
*1 Standard global devices and safety global devices are transferred even when the tracking transfer settings differ between the both
systems. However, devices that are included in the device range settings of the control system CPU module and not included in the
device range settings of the standby system CPU module are not reflected to the standby system CPU module. (The standby system
CPU module reflects values according to the device range settings of the standby system.)
If the files differ between the control system and the standby system, the following tracking transfer stops.
Tsc: Safety cycle time
Pg: Standard program
Scp: Safety cycle processing
Ptr: Tracking
END: END processing
(1) Tracking transfer to the standby system is performed.
Condition Data for which the tracking transfer is stopped
When there is a difference in any of standard CPU parameter file, standard
program file, standard FB file, or standard global label setting file
• Standard local device
• Standard global label
• Standard local label
• Standard signal flow memory
When there is a difference in any of safety CPU parameter file, safety program
file, safety FB file, safety global label setting file, or standard/safety shared
label setting file
• Safety local device
• Safety global label
• Safety local label
• Standard/safety shared label
• Safety signal flow memory
ScpScp Scp Scp Scp Scp
Tsc Tsc Tsc Tsc Tsc
Pg Pg Pg
END END END
Pg Pg Pg Pg
(1)
(1)
PtrPtr
END
1 scan 1 scan
Control system
Standard control
Safety control
Interrupt
Interrupt Interrupt Interrupt
Interrupt Interrupt
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