167
Overview of Direct Connection Operations
Section 5-1
❍
: OK
: 1 word only
×
: NG
When allocating words to a memory table entry, the allocation must not
exceed the word area.
Since the AR area bits of the CV series PLCs are allocated to the system,
they cannot be used for purposes other than the system use. However, read-
ing from them is possible.
Note
(1) LR 00000 to LR 00199 are converted to CIO 01000 to CIO 01199.
(2) The EM Area is supported only by the C200HX/HG/HE-(Z)E PLCs.
(3) A continuous areas of up to 2 words for a numeral memory table entry or
16 words for a character string memory table entry can be allocated.
5-1-3
NT20 Status Control and Notification to PLC
The following describes the fundamentals of the display elements, NT20 sta-
tus control, and notification, which are the basics of the NT20 functions when
using the host link/NT link.
For the detail method of use of the PT status control area and the PT status
notify area, refer to
5-4 NT20 Status Control
on page 203 and
5-5 Notification
of the Operating Status to the PLC (Determining the NT20 Operating Status)
on page 208.
Controlling the Display Elements by Using Allocated Bits and Words
The NT20 will operate as follows in the display element control operation.
NT20 Operation
1.
The NT20 checks the allocation bits and words of the display elements and
makes an inquiry to the PLC.
2.
The PLC answers the NT20 about the bit and word data.
Symbol
C Series PLCs
CVM1/CV Series PLCs
Area Name
Allocated
Bit
Allocated Word
Area Name
Allocated
Bit
Allocated Word
Numeral
Character
String
Numeral Character
String
None
IR Area
❍
❍
❍
CIO Area
❍
❍
❍
H
HR Area
❍
❍
❍
---
---
---
---
A
AR Area
❍
❍
❍
AR Area
❍
❍
❍
LR
LR Area
❍
❍
❍
---
---
---
---
T
TC Area
Timer PVs
×
TC Area
Timer PVs
---
---
---
TU
---
---
---
---
---
×
C
TC Area
Counter PVs
×
TC Area
Counter PVs
---
---
---
CU
---
---
---
---
---
×
W
WR
×
×
×
---
---
---
---
TK
---
---
---
---
---
---
---
---
D
DM Area
❍
❍
❍
DM Area
❍
❍
❍
E
EM Area (See
note 2.)
Current bank
❍
❍
❍
EM Area
Current bank
❍
❍
❍
E0_ to
EC_
---
---
---
---
---
---
---
---
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 ...