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209
Notification of the Operating Status to the PLC (Determining the NT20 Operating Status)
Section 5-5
• Screen Switch Strobe Flag (Bit 12)
When the screen displayed on the NT20 is switched by a designation from
the PLC or by the standalone function, the screen switch strobe flag comes
ON (1). On notification to the PLC, it returns to the OFF (0) status.
For details on how the screen switch strobe flag is used, refer to
5-1-5 No-
tifying the PLC of the Display Screen (to Display the Number of Currently
Displayed Screen)
on page 174.
• Numeral Setting Strobe Flag (Bit 11)
When numerical data is input to a numeral memory table entry using the
NT20 numeral setting function, the numeral setting strobe flag comes ON
(1). On notification to the PLC, it returns to the OFF (0) status.
For details on how the numeral setting strobe flag is used, refer to
5-3-6
Notification of Numbers to the PLC
page 199.
5-5-2
Reading the NT20 Operating Status
This section explains how to determine the status of the NT20, and ascertain
its operating status.
To ascertain the operating status of the NT20, “PT status” is used.
The NT20 automatically notifies the PLC of information such as the operating
status in the PT status word of the PT status notify area (PT
→
PLC) allocated
in PLC memory as shown below.
Notification of operation mode:
PT operating status
Notification of screen switching:
Screen switch strobe flag
Notification of numerical data upgrade:
Numeral setting strobe flag
• Restrictions on Allocating Words
The PT status notify area (PT
→
PLC) can be allocated to the PLC memory
areas listed in the following table.
❍
: OK
×
: NG
Symbol
C-series
Alloca-
tion
CVM1/CV -series
Alloca-
tion
CS/CJ-series
Alloca-
tion
None
IR Area
❍
CIO Area
❍
CIO Area
❍
H
HR Area
❍
---
---
HR Area
Not for
Host Link
A
AR Area
❍
AR Area
×
AR Area
❍
L
LR Area
❍
---
---
LR Area (See note 1.)
Not for
Host Link
T
TC Area
Timer PVs
×
TC Area
Timer PVs
×
TC Area
Timer PVs
×
TU
---
---
---
---
TC area,
Timer Completion Flags
×
C
TC Area
Counter PVs
×
TC Area
Counter PVs
×
TC Area
Counter PVs
×
CU
---
---
---
---
TC area,
Counter Completion Flags
×
W
---
---
---
---
WR
Not for
Host Link
TK
---
---
---
---
Task Flags
×
D
DM Area
❍
DM Area
❍
DM Area
❍
E
EM Area
(See note 2.)
❍
EM Area
Current bank
Not for
Host Link
EM Area
Current bank
Not for
Host Link
E0_to EC_
---
---
---
---
EM Area
EM bank 0 to C
Not for
Host Link
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 ...