Restart Mode

Owned by CIMON (Unlicensed)
Mar 21, 2024
2 min read

This is used to set up how to initialize variables and a system when the operation of a PLC is started in RUN mode by resuppling power or converting mode. There are two types such as Cold Restart and Hot Restart.

 

image-20240321-053618.png

 

If you check the Hot Restart in the Parameter, a PLC is operated in the Hot Restart mode up to the Base Time. Otherwise, it is operated in the Cold Restart mode.

If the PLC does not include a RTC function, will be not support the Cold Restart and Hot Restart. (CM1-CP3A, CM1-CP4A, CM3-SB16MDT)

 

Cold Restart

  • The operation is in this mode if the Hot Restart is not checked in the Parameter.

  • This is used to clear all data as ‘0’ and to enter the initialization value for only the variables with initialization values.

Hot Restart

  • If the operation is in the RUN mode when power is off and is resupplied, and the time from power failure to resupply is within the set time to permit the Hot Restart, the operation is in the Hot Restart mode.

  • This is used to restore all data and the factors for running a program to the state prior to power failure and to operate.

  • As a program is run again in the state prior to power failure, the program is kept continuously against instantaneous break-down.

  • In case that it is over the set time to permit the Hot Restart, the operation is in the Cold Restart mode.

  • In case that the data is not kept against power failure, the operation is in the Cold Restart mode.