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6
Functions of NT20
Section 1-2
1-2-3
Comparison between NT20S, NT20M, and NT20
The NT20 is a unitary PT which incorporates a system ROM, screen memory,
and a host I/F unit (Host link, NT link, RS-232C, and C200H direct communi-
cations) as the standard equipment in one body.
The NT20 has the following features which are different from those of existing
NT20/NT20S:
Note
If a system key function is required on continuous screens or for numerical
setting or buzzer stop, use the Support Tool and set the touch switches which
have the system key function in such screens.
For details, refer to
4-7-3 System Key Functions
on page 154.
Function
NT20S
NT20M-DT121-V2
NT20
Communications
• Host link/NT link incorpo-
rated NT20S-ST121-EV3
• C200H direct communica-
tions incorporated
NT20S-ST122-V1
• RS-232C incorporated
NT20S-ST128
(other host I/F units cannot
be connected)
Host I/F units are required.
• Host link/NT link
• C200H direct communica-
tions
Host I/F unit for C200H com-
munications is required.
• RS-232C incorporated
NT20-ST128 (other host I/F
units can not be connected)
Communications connec-
tor
• The communications con-
nector (9-pin) for a Host is
shared with that for the Sup-
port Tool. (NT20S-ST121-
EV3/ST128)
• Connectors for Support Tool
(9-pin) and Host connec-
tions on the rear face
(NT20S-ST122-V1).
The Support Tool connector
(9-pin) is located on the front.
The Host connector (25-pin)
is located on the back.
• The communications con-
nector (9-pin) for a Host is
shared with that for the Sup-
port Tool. (Port A)
• The communications con-
nector (9-pin) for a Host
(Port B)
Host RUN input terminal/
Alarm output terminal
Not provided
Provided
Not provided
System keys
Not provided
Provided
Not provided
Contrast control
Back
Front
Back
Waterproof performance
Equivalent to oil-resistant
IP65
Conforms to IP54F.
Equivalent to oil-resistant
IP65
Allowable momentary
power interruption time
Not guaranteed
5 ms
Not guaranteed
System ROM
Built in (not replaceable)
System ROM compatible with
host I/F unit is required.
Flash ROM rewriteable
Resume function
Not provided
Provided
Not provided
History retaining function
Not provided
Provided
Not provided
Screen transfer
❍
❍
(Only possible if screen
data memory is an SRAM)
❍
Screen data compatibility
❍
(Note)
–
❍
(Note)
PLC ladder compatibility
❍
–
❍
Backlight replacement
❍
Possible with NT20M-DT131. Do not need
Screen data memory
Built in (flash ROM only)
Optional (select from
EPROM, SRAM, and
EEPROM)
Built in (Flash ROM)
Screen data memory
capacity
96KB
128 KB max.
512 KB
Outside dimensions
190
×
110
×
58 mm
220
×
110
×
82 mm
190
×
108
×
53.5 mm
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 ...