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Examples of Actual Applications of Direct Access
Section 10-1
(3) Register an alarm list, set as indicated below, for any screen.
- “Color” setting, “Background”, “ON”:
Red
- List Settings:
Set the “Start Bit Table Entry” and “No. of Bits Referenced” so as to include
the bit memory table set in (2) above.
(4) Register the following elements on the screen that displays the error details.
Numeral displays that display the temperature in each part
Image/library lamp corresponding to each part
(When the bit that indicates the error location comes ON,
the corresponding image/library lamp lights in red.)
_C _C _C
_C _C _C
Hints
S The ladder program must be written so that at the same time as the bit that indi-
cates the temperature error comes ON, the bit that indicates the error location
for the relevant temperature also comes ON.
Example: Displaying a screen with details of the times at which alarms occurred in the past
when the “TEMPERATURE ABNORMAL” alarm message is pressed.
Alarm list Alarm history
TEMPERATURE
ABNORMAL
TEMPERATURE ABNORMAL13:12
CONVEYOR STOPPED 11:47
PROCESS 3 STOPPED 11:23
NT31/NT31C
(1) Set “TEMPERATURE ABNORMAL” as the initial value for any character
string memory table.
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