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5.1 Basic Concept of Redundant System
5.1.6 Start Mode
5
REDUNDANT SYSTEM FUNCTIONS
(3) Differences Between Initial Start Mode and Hot-start Mode
Table5.20 shows the differences between Initial start mode and Hot-start Mode.
* 1: Clear device data by latch clear.
Table5.20 Differences Between Initial Start Mode and Hot-start Mode
Initial Start Mode Hot Start Mode
Device
Memory
All Other Than Index Register
and Step Relay
Not held in power OFF Cleared
Held
*1
Held in power OFF Held
Index Register and Step Relay Cleared
Special Relay and Special Register Initial value is set
Initial Device Value Setting Range Initial value is set
Local Device Cleared
File Register Held
Program
Execution
Initial Execution Type Program
Executed only one time during STOP RUN
Interrupt Permitted / Not Permitted Set to not permit interrupt
SM402 (After RUN, ON for 1 scan)
Turned ON 1 scan during STOP RUN
SM403 (After RUN, OFF for 1 scan)
Turned OFF 1 scan during STOP RUN
Program Execution Type (Initial / Scan / Standby) Based on the PLC parameter settings
File Register Settings Based on the PLC parameter settings
Comment File Settings Based on the PLC parameter settings
SFC Program Startup Mode Based on the PLC parameter settings
Boot from Memory Card / Standard ROM Based on the PLC parameter settings
Intelligent Module Parameter Initial Settings The intelligent module parameters are reflected
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