295
Memory Tables
Section 7-3
7-3-3 Bit Memory Tables
[Function Outline]
Bit memory tables are internal memories for bit data.
They are allocated to a bit at the host to monitors a bit, and can execute a specific
function in accordance with the status of that bit.
Bit memory tables are assigned bit memory table numbers so that they can be
managed and designated individually.
Bit memory tables have the following functions.
S Screen changeover function
When the host bit to which a bit memory table is allocated changes status from
“0” (OFF) to “1” (ON), the screen whose screen number is set in the bit memory
table is displayed.
No. 1
← 1 (ON)
No. 2
No. 3
0
0
0
Screen number 11
displayed
Screen number 10
Screen number 11
Screen number 12
Bit PC
If the allocated bits of multiple bit memory tables come ON at the same time, the
bit memory table with the smallest number takes priority.
S Alarm list/history function
When the status of the host bit to which a bit memory table is allocated changes
to 1 (ON), the contents of the character string memory table (message), and
image/library data set for that bit memory table are displayed (this is the “alarm
list function”). In order to use the alarm list function, it must be registered for the
screen in advance. If more than one bit memory table is set for the alarm list
function, those with smaller bit memory table numbers are given display priority,
therefore it is possible to assign an order or priority to displayed messages.
If registration in the alarm history is designated, the time when the status of the
host bit to which the bit memory table is allocated changes to “1” (ON) is re-
corded in the alarm history (“alarm history function”).
For details, refer to 7-11 “Alarm List, Alarm History” (page 406 ).
Character string
memory table No. 32
Image/library
data 102A
Message (character string memory table
No. 32) and image/library data (102A)
set for bit memory table No. 14.
Character string memory table No. 50
Image/library data 0F51
Character string memory table No. 32
Image/library data 102A
Character string memory table No. 54
Image/library data 12AB
Bit PC
No. 13
← 1 (ON)
No. 14
No. 15
0
0
0
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