Rockwell-automation 1794-L34 FlexLogix Controller System User Manual Manual do Utilizador descarregar pdf (Página 38)

Publication 1794-UM001G-EN-P - January 2007

38 Communicate over Networks

Convert data to or from ASCII characters

For more information...

The Logix5000 Controllers General Instructions Reference Manual,

1756-RM003 defines the instructions you can use to manipulate ASCII

characters.

The Logix5000 Controllers Common Procedures Manual, 1756-PM001

provides information on how to:

• communicate with an ASCII device

• transmit/receive ASCII characters

Modbus support

To use Logix5000 controllers on Modbus, you connect through the

serial port and execute specific ladder logic routines. A sample

controller project is available with RSLogix 5000 Enterprise

programming software. From RSLogix 5000 software, select Help

→

Vendor Sample Projects to display a list of available, sample projects.

If you want to: Use this instruction:

convert the ASCII representation of an integer value to a SINT,

INT, DINT, or REAL value

STOD

convert the ASCII representation of a floating-point value to a

REAL value

STOR

convert a SINT, INT, DINT, or REAL value to a string of ASCII

characters

DTOS

convert a REAL value to a string of ASCII characters RTOS

convert the letters in a string of ASCII characters to upper case UPPER

convert the letters in a string of ASCII characters to lower case LOWER

See:

• Logix5000 Controllers as Masters

or Slaves on Modbus Application

Solution, CIG-AP129

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Rockwell-automation 1794-L34 FlexLogix Controller System User Manual Manual do Utilizador Página 38