6-3
Section
Alarm
169
If the size of the image/library data is smaller than the display area, the image/
library data is displayed taking the lower left corner of the display area as the
reference.
Image/library data display area
Image/library data
Reference: With the NT21, NT31, NT31C, NT631, and NT631C, if image/library data is larg-
er than the image/library data display area, the area exceeding the display area
will not be displayed on PT while the whole data is displayed on the Support Tool.
Be sure to set image/library data display area so that image/library data fits inside
it.
For an alarm history element, the property settings, bit memory table entry, and
character string memory table entry (string table) are related to each other as
shown below.
Character string memory
table entry (String table)
:10
:FE20
:H0001512
10
11
12
13
ABC
DEF
GHI
JKL
FE20
ABC 02/12
H0001512 97/02/12 10:51
History data
Alarm list
Displayed
at ON
Bit memory table
Image/library data
PC (PLC) address
Character string
memory table
(String table)
Image data
Specified PC
(PLC) bit
Number of bits; Set for No. of Bits
Referenced
table entry No.: Set for Start Bit
Table Entry
An alarm history element is used in combination with the bit memory table
entry. How they function is shown below:
Setting at bit memory table entry
Setting at Set dialog box
PLC Address
Setting at Function dialog box
History
Screen No.
Switch Screen
Screen No.
