Omron NT620C, Operation Manual

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5-1 Section Outline of Host Link/NT Link Operation
194
To switch the screen displayed on the screen of the NT620S/620C under the con-
trol of the PC, the allocated bit of the bit memory table in which the screen number
of the screen to be displayed is registered is set to “1” (ON).
NT620S/620C PC
Screen No. 42
displayed
Screen No. 42
Allocated bit (bit table 1)
Bit table 1
←
1 (ON)
Reference The screens numbered 1997 to 1999 are earmarked for special functions, as
shown below. The display history can be checked by calling them during opera-
tion.
1997 : Display history (order of occurrence) screen
1998 : Display history (order of frequency) screen
1999 : Screen when connected to the host
S
Available allocation bits
Bit memory tables can be allocated to the following areas of the PC.
Symbol C Series PCs Allocated CVM1/CV Series PCs Allocated
DM Data Memory
f
Data Memory
f
CH Internal/Special Relay
f
Internal/Special Relay
f
TIM Timer Timer
CNT Counter Counter
HR Holding Relay
f
–
AR Auxiliary Relay
f
Auxiliary Relay
LR Link Relay
f
–
f
: OK : NG
Since the special auxiliary relays of the CV series PCs are allocated to the sys-
tem, they cannot be used for purposes other than system use.
The range of respective area varies with the type of PC. Refer to Appendix L
“PC Memory Map” (page 327).
Procedure 1. Use the support tool to set the following for the following for a bit memory
table: a screen switching function, the screen number of the screen to be dis-
played, and the area of the PC to which the bit is to be allocated.
2. At the PC, write the program that will switch the allocated bit from OFF to ON
and switch the screen display.
In cases such as that where a warning screen is to be displayed when a par-
ticular bit is turned ON, there is no need to write a program; it is sufficient just
to set the allocated bit.
S
Screen display timing
The NT620S/620C screen switches when the allocated bit of the bit memory
table changes from the “0” (OFF) to “1” (ON) status. However, the display does
not change when the allocated bit returns from the “1” (ON) to the “0” (OFF)
status.