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199
Lamps, Touch Switches, Numeral Setting
Section 5-3
• Program Operation
The operation when the program is executed is presented below.
5-3-6
Notification of Numbers to the PLC
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:
PT status numeral setting strobe
flag turned ON (1)
Upgraded numeral table entry number:Stored in the “upgraded mem-
ory table entry”
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.
Execute program
Press Run touch switch.
Press Stop touch switch.
Stop flag
:
1 (ON)
Stop touch switch :
Lit
Run flag
:
1 (ON)
Run touch switch : Lit
Stop flag
:
0 (OFF)
Stop touch switch :
Unlit
Run flag
: 0 (OFF)
Run touch switch : Unlit
Stop flag
: 1 (ON)
Stop touch switch : Lit
Numeral memory table entry 1
PT status notify area
Allocated words (numeral table entry 1)
Start
Start + 1
NT20
PLC
12345678
Currently displayed screen
PT status
Content upgrade
memory table
Table entry No.
Numeral setting
strobe flag
12345678
12345678
Summary of Contents for NT20
Page 1: ...Programmable Terminal Cat No V091 E1 01 NT20 USER S MANUAL ...
Page 2: ...NT series Programmable Terminal User s Manual Produced March 2007 ...
Page 3: ...iv ...
Page 5: ...vi ...
Page 9: ...x TABLE OF CONTENTS ...
Page 15: ...xvi ...
Page 21: ...xxii EC Directives 6 ...
Page 37: ...16 Before Operating Section 1 6 ...
Page 153: ...132 Transferring the Resource Data Section 3 11 ...
Page 185: ...164 Numeral Setting Section 4 8 ...
Page 267: ...246 Key to Programs Section 6 8 ...
Page 281: ...260 Specifications Appendix A ...
Page 285: ...264 Transporting and Storing PTs Appendix C ...
Page 303: ...282 Function Restrictions Depending on the Support Tool Appendix I ...
Page 307: ...286 Index ...
Page 309: ...288 Revision History ...