Rockwell-automation 2706-DXX Dataliner Message Display DL5 Series Instrukcja Użytkownika Pobierz pdf (Strona 109)

2706-UM001A-US-P

Appendix D

Application Notes

Unsigned Integer to String

Conversion

Serial protocol uses decimal values in the range of 0 to 65535 to send

variable data (Ctrl-V command). PLCs that do not support unsigned

integers can only generate values in the range of -32768 to 32767. To send

decimal values in the range used by the serial protocol, use the following

ladder logic. This program converts a 16-bit signed integer to an unsigned

ASCII decimal string. The ASCII decimal string can then be used to

generate serial commands for the DL5.

In this example, the 16-bit integer is in N17:0 (signed value = -12264,

unsigned value = 53272). The conversion uses N17:1 and ST18:1-4 as

temporary buffers. The ASCII decimal string is returned in ST18:5. The

conversion routine ladder logic is as follows:

AIC

Integer to String

Source

N17:0

-12264<

Dest ST18:5

GEQ

Grtr Than or Eql (A>=B)

Source A

-12264<

Source B 0

N17:0

0000

AIC

Integer to String

Source

Dest ST18:1

LES

Less Than or Eql (A<B)

Source A

-12264<

Source B 0

N17:0

0001

SUB

Subtract

Source A

N17:0

-12264<

Source B -5536

15536<

Dest N17:1

3272<

AIC

Integer to String

Source

Dest ST18:1

LES

Less Than or Eql (A<B)

Source A

-12264<

Source B -5536

N17:0

-5536<

0002

SUB

Subtract

Source A

N17:0

-12264<

Source B -15536

-15536<

Dest N17:1

3272<

1 2 ... 104 105 106 107 108 109 110 111 112 113 114 ... 118 119

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