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11
Communications with PLC by Direct Connection
Section 1-4
• Touch Switches
Allocation Destination: Bit
The lamp comes on (flashes) when the PLC’s control bit is ON (1) and
goes off when it is OFF (0). When the touch switch is pressed, the PLC’s
notification bit comes ON (1) or goes OFF (0).
• Numeral Memory Table
Allocation destination: Word
Allocate the numeral memory table entries to arbitrary words in the PLC. If
word contents change when corresponding numeral memory table entry is
displayed on the screen, the value on the screen will also change. Monitor-
ing of words can also be made easily.
Reading and writing are executed so that the contents of allocated words
and contents of numeral memory table entries are always the same during
display.
• Character-string Memory Table
Allocation destination: Word
Allocate character-string memory table entries to arbitrary words in the
PLC. If word contents change when corresponding character-string mem-
ory table entry is displayed on the screen, the value on the screen will also
change. Messages can be displayed easily.
Reading and writing are executed so that the contents of allocated words
and contents of character string memory table entries are always the same
during display.
Bit 009012: ON
NT20
PLC
Touch switch
12 Bit 009012
Numeral memory table entry 150 (word 0005)
NT20
PLC
Numeral memory
table entry 1 (TIM003)
NT20
PLC
("a", "b")
("c", "d")
("e", "f")
Character-string memory table entry 1
Allocated word number: 3
First word: DM0100
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 ...