Two Init Commands

The PLC menu in Control Expert provides two separate commands for the initialization of data:

• The Init command initializes data for the process (or non-safe) namespace, which can be used by the MAST, FAST, AUX0 and AUX1 tasks. You can execute this command if the PAC is operating in either safety or maintenance mode while the PAC is in the STOP state. This command is the equivalent of setting the system bit %S0 (COLDSTART) to 1.

  NOTE: Setting the %S0 bit to 1 initializes data in the process namespace only. It does not affect data in the safe namespace.

• The Init Safety command initializes data only for the safe namespace, which data can be used exclusively by the SAFE task. You can execute this command only if the SAFE task is operating in maintenance mode while the SAFE task is in the STOP or HALT state. Executing this command when the SAFE task is in the HALT state causes the SAFE task to restart in the STOP state.

Both the Init and the Init Safety commands perform a cold start.