Rockwell Automation 1794-L34 FlexLogix Controller System User Manual - Manual (Page 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