Forced Variable Behavior
| WARNING | |
|---|---|
UNEXPECTED VARIABLE BEHAVIOR Check your forced variables and memory protection switch
when shifting between Modsoft/NxT/Concept and Control
Expert. Failure to follow these instructions can result in death, serious injury, or equipment damage. | |
The behavior of forced variables has been changed between Modsoft/NxT/Concept and Control Expert.
With Modsoft/NxT/Concept you cannot force variables (0x, 1X) with the Quantum CPU memory protect switch in the ON position.
With Control Expert you can force variables (%M, %I, %Q) with the Quantum CPU memory protect switch in the ON position.
When using a basic Quantum CPU, if the memory protect switch is in the OFF position, some variables are forced and the application is saved in flash memory:
with Modsoft/NxT/Concept, forced variables keep their state after a cold start,
with Control Expert, forced variables lose their state after a cold start.
Warning Message when Forcing Variables
A warning message will display in Control Expert each time that variables are forced on the following Quantum PLCs:
140 CPU 311 10
140 CPU 434 12A/U
140 CPU 534 14A/U
This warning message includes a "Do not warn me again" option so that, when checked, the message will not be redisplayed during the current Control Expert session. Starting a new session of Control Expert means that the option must be checked once more in order to no longer see it when forcing a variable.