Nt20 Status Control And Notification To Plc - Omron NT20S-ST121B-EV3 User Manual

Overview of Direct Connection Operations
Symbol
Area Name
None IR Area
H HR Area
A AR Area
LR LR Area
T TC Area
Timer PVs
TU ---
C TC Area
Counter PVs
CU ---
W WR
TK ---
D DM Area
E EM Area (See
note 2.)
Current bank
E0_ to ---
EC_
Note
5-1-3

NT20 Status Control and Notification to PLC

Controlling the Display Elements by Using Allocated Bits and Words
C Series PLCs
Allocated Allocated Word
Bit
Numeral Character
String
❍ ❍ ❍
❍ ❍ ❍
❍ ❍ ❍
❍ ❍ ❍
×
--- --- ---
×
--- --- ---
× × ×
--- --- ---
❍ ❍ ❍
❍ ❍ ❍
--- --- ---
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.
(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.
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.
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.
CVM1/CV Series PLCs
Area Name Allocated
Bit
❍
CIO Area
--- ---
❍
AR Area
--- ---
TC Area ---
Timer PVs
×
---
TC Area ---
Counter PVs
×
---
--- ---
--- ---
❍
DM Area
❍
EM Area
Current bank
--- ---
❍: OK
Section 5-1
Allocated Word
Numeral Character
String
❍ ❍
--- ---
❍ ❍
--- ---
--- ---
--- ---
--- ---
--- ---
❍ ❍
❍ ❍
--- ---
: 1 word only × : NG
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