Omron NT2S-SF123B-E - Gebrauchsanweisung

While writing this document, It is assumed that the user is well acquainted with the PLC

being used and with Windows based software usage, in general.

[Hereafter, in the manual, NT2S-SF123B-E will be referred to as NT2S C.]

General:

The NT2S C is intended to be used as a low cost Operator interface for PLCs which are rich in

program memory or data memory areas such as the Omron C Series PLCs.

The NT2S C has the following features:

Feature NT2S C

Display Backlit2X16LCD

LEDs 2

Keys 6

ASCII screens 32 characters

Embedded variables 16

Key definitions:

Each key is mapped from work bits I0201.00 to I0201.05. Every time a key is pressed, the

corresponding bit as shown in the table below is held on while the key is pressed. The keys also

have alternate functions.

Key Work Register mode function

Bit

F1/REG I0201.00 Changes register prefix

F2/DATA I0201.01 Enters data entry mode

F3/DOWN I0201.02 Increments register number or data depending on mode

F4/UP I0201.03 Decrements register number or data depending on mode

F5/CLR I0201.04 Clears data field to 0 / Register field to first register value

F6/ENT I0201.05 Accepts new data and sends to the PLC

Unit Operations:

The work bits I0200.00 to I0200.15 control the mode of operation of the unit as follows:

Work Bit Function

I0200.00 Controls LED0

I0200.01 Controls LED1

I0200.02 &

I0200.03 Not used

I0200.04 to

I0200.07 Reserved for future use

I0200.08 & 00 :Screen mode 01 :Register mode

I0200.09 10 :Operator mode 11 :Invalid

I0200.10 & Timeout to screen mode from Operator mode

I0200.11 00 :10 seconds 01 :20 seconds

10 :30 seconds 11 :40 seconds

I0200.12 to

I0200.14 Reserved for future use

I0200.15 To disable data entry in Screen mode

(ON : Disable)

From the above table, it is clear that the unit will display ASCII text (see section on Screens for

more details on this ) if I0200.08 and I0200.09 are OFF. To allow operators to view and edit the

registers, I0200.09 is to be kept ON. If I0200.09 is OFF, the unit will not display any registers and

the function keys will only act as push buttons mapped to the corresponding bits from I0201.00.

Refer to “Register Mode” for details. If I0200.09 is ON, REG key press will allow an operator to

view the registers. The REG key will scroll through the available register types whereas the UP

and DOWN arrow keys will scroll through the register/bit numbers. After timeout specified by bits

10 and 11 and if no key is pressed, the unit will switch back to the Screen mode and display

screens. Thus Operator mode is a combination of Register as well as Screen modes.

Screens :

The unit displays 32 characters from the PLC memory.

These characters are taken from the PLC data registers.

The unit tracks register DM0020 ( the Offset register ) in the PLC. The number in DM0020 gives

the start address of the data register block which contains the characters to be displayed. For

example, if DM0020 has number 124 in it, the unit will read 16 registers from DM0124, i.e. from

DM0124 to DM0139 and display the corresponding characters.

Each register contains two bytes. Each ASCII character to be displayed is one byte. So, each

word contains two characters that can be displayed. All the PLC ladder logic has to do is to put

the correct words in the registers being read by the unit so that a proper screen can be displayed.

As mentioned above, the starting address of the screen data block is controlled by the Offset

One is to keep the value in DM0020 constant and change the data in the screen registers in the

ladder logic. Second is to keep the screen text in the data memory (by editing DM registers) and

change the value in DM0020 so as to point to the correct memory address to display the desired

screen.

It is possible to embed registers in the screens. The unit reads 16 registers from DM0000 to

DM0015 (in which DM0012 to DM0015 are used for Bar Graph) in every scan. The data in these

registers can be embedded in the screens. To do so, use hex bytes 0 to B (C to F used for Bar

Graph) corresponding to register DM0000 to DM0011 respectively in the screen. Refer to the

example given which explains the embedding of registers.

It is possible to embed one data entry field in screens. It is similar to embedding register, only

instead of 0 to F use 10 to 1F hex bytes to address DM0000 to DM0015. The registers DM0000

to DM0015 can be edited with this feature one at a time in a screen.

Example 1: To display a static screen

Suppose the following screen needs to be displayed on the NT2S C :

Last Rinse Cycle

Water pump is on

To display this screen, do the following:

a. Move number 200 in DM0020 since the screen text will be stored in DM0200 onwards.

b. Move character string “Last Rinse Cycle” into 8 words from DM0200.

c. In a similar manner, the characters “Water pump is on” can be embedded into 8 words

from DM0208. (i.e. from DM0208 to DM0215)

This will put the following data in the data words below:

Word ASCIIHex Word ASCIIHex

DM0200 La 4C61H DM0208 Wa 5761H

DM0201 st 7374H DM0209 te 7465H

DM0202 R 2052H DM0210 r 7220H

DM0203 in 696EH DM0211 pu 7075H

DM0204 se 7365H DM0212 mp 6D70H

DM0205 C 2043H DM0213 i 2069H

DM0206 yc 7963H DM0214 s 7320H

DM0207 le 6C65H DM0215 on 6F6EH

Example 2: Embedding a variable in the screen

Suppose the following screen needs to be displayed :

Door: CLOSED

BAKETIME: 13.6s

Suppose the bake time is available in data word DM0100 and the oven status is given by bit

I001.00.

To display the above screen, do the following:

a. Move number 200 in DM0020 since the screen will be stored in DM0200 onwards.

b. Move character string “Door:” into 2 words, i.e. DM0200 and DM0201.

c. Move characters “OPEN” if bit I001.00 is ON or characters “CLOSED” if I001.00 is OFF.

d. In a similar manner, embed the characters “BAKETIME: ” into 5 words from DM0208.

e. NT2S C uses DM0000 to DM0011 registers for embedding data. Here we select

DM0003 to be used for embedding. So, move the data of DM0100 into DM0003 so that

embedding can be done.

f. Put 03032E03H in words DM0213 and DM0214. The NT2S C will read data in DM0003

and embed in xx.x format.

g. Move “s “ into DM0215. This command completes the screen by appending the “s ” to

the bake time.

This will put the following data in the data words below:

Word ASCII Hex Word ASCII Hex

DM0200 Do 446FH DM0208 BA 4241H

DM0201 or 6F72H DM0209 KE 4B45H

DM0202 : 3A20H DM0210 TI 5449H

DM0203 CL 434CH DM0211 ME 4D45H

DM0204 OS 4F53H DM0212 : 3A20H

DM0205 ED 4544H DM0213 0303H

DM0206 2020H DM0214 2E03H

DM0207 2020H DM0215 s 7320H

In the register mode, the operator can access all the registers and bits in the PLC.

By pressing the REG key, the operator can scroll through the register prefixes. By using the UP

or DOWN keys, the register numbers can be accessed. Data can be changed in the registers by

pressing the DATA key. The data field will blink to indicate that the unit is ready to accept new

data. At this time, the UP or DOWN keys can be used to edit data followed by the ENT key.

It is advisable to create a “password” screen which can block the usage of the register mode.

Bar Graph:

NT2S C uses DM0012 to DM0015 registers to hold bar graph values to be displayed. If Offset

with the value in DM0012.

Example:

Put 0C0C into DM0200, DM0201, DM0202, DM0203 and 200 into DM0020. This will display bar

graph 8 characters wide. Maximum length is 16 characters. Each character on display can

display 5 vertical lines. To display full bar graph put # 80 into DM0012 and 0C0C from DM0200

to DM0207.

To display Bar Graph with value in DM0013, put 0D0D in DM0200 onwards.

Triggering screens :

As it can be seen from the above examples, there are two ways to display screens with NT2S C :

1. Keep all the message characters in the data memory ( the Omron PLCs have lot of data

registers which in most applications involving simple digital controls are not used anyway )

and simply change the offset register to display different screens.

The user can fill the data memory using the “data display editor” menu of the PLC programming

software.

2. Note that the data memory as well as the program memory can be used for embedding of

data.

Of course, a combination of the two methods can be used to optimise the memory usage.

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