S5-100U Integrated Blocks and Their Functions
9.1.6 Transferring DB1 Parameters to the Programmable Controller
Unlike other data blocks, DB1 is processed only one time. This occurs when a cold restart is
performed on the programmable controller. This was done so that DB1 could handle certain special
functions.
One such special function is the assignment of parameters in the programmable controller with the
help of DB1. Setting parameters means that you enter parameters in DB1 for those internal
functions that your programmable controller should work with.
The programmable controller's operating system accepts these inputs into DB1 only when there is a
cold restart. You must perform a cold restart anytime you make changes to DB1. You can perform a
cold restart by switching from Power OFF to Power ON or from STOP to RUN.
The programmable controller accepts the parameters from DB1 and stores them in the system data
area.
Note
The CPU remains in the STOP mode if a parameter assignment error is found during
start-up
. The red LED lights up on the operator panel and ISTACK displays a DB1
addressing error.
EWA 4NEB 812 6120-02
9-9
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