Notification Of Numbers To The Plc - Omron NT20S-ST121B-EV3 User Manual

Lamps, Touch Switches, Numeral Setting
5-3-6

Notification of Numbers to the PLC

• Program Operation
The operation when the program is executed is presented below.
Press Run touch switch.
Run flag : 1 (ON)
Run touch switch : Lit
Stop flag : 0 (OFF)
Stop touch switch : Unlit
The following describes how the numerical data input at the NT20 by using
the numeral setting function is ascertained by the PLC.
In order to determine when numerical data has been input at the NT20, the
numeral setting strobe flag in the PT status notify area is used. In order to
determine the upgraded numeral memory table entry number, the "upgraded
memory table entry" in the PT status notify area is used.
When numerical data is input at the NT20, this is automatically indicated in
the PT status notify area (PT → PLC) allocated in the PLC memory as follows.
Notification of upgrade:
Upgraded numeral table entry number:Stored in the "upgraded mem-
When the PLC reads the "upgraded memory table entry" at the leading edge
of the numeral setting strobe flag, it determines the numeral memory table
entry number in which the numerical data that was changed at the NT20 is
stored.
NT20
12345678
Execute program
Stop flag : 1 (ON)
Stop touch switch : Lit
Press Stop touch switch.
Run flag
Run touch switch : Unlit
Stop flag
Stop touch switch : Lit
PT status numeral setting strobe
flag turned ON (1)
ory table entry"
PLC
Numeral memory table entry 1
PT status notify area
12345678
Currently displayed screen
Content upgrade
memory table
PT status
Allocated words (numeral table entry 1)
12345678
Section 5-3
: 0 (OFF)
: 1 (ON)
Table entry No.
Numeral setting
strobe flag
Start
Start + 1
199