PLC-5/250: symbolic addresses
Wish symbolic addresses, you can substitute a name for an address, and relate the address to the physical use of the address in your application. For example, you could substitute the name
LS1
for the input image bit I:007/10
to indicate that the input is Limit Switch #1.When you specify symbolic addresses:
- If you want to use Rockwell Software 6200 Series software along with PLC-5/250 A.I. Series, there are some compatibility issues to consider. PLC-5/250 A.I. Series allows 15-character symbols, while 6200 Series allows 10-character symbols. PLC-5/250 allows you to start a symbol with any valid character, while 6200 Series allows only alphabetical characters to start symbols. There are further restrictions on what 6200 Series allows in a symbol:This software:Accepts these characters:Rejects these characters:PLC-5/250 A.I. Series\ _ % & ( ) - = ; " ', ~ @ ^ , < > ` | { } ! +# $ * : [ ] ? / .6200 Series\ _ ~ @ ^ ` | { } [ ]! % & ( ) + - = ; " ' , < > # $ * : ? / .
- You can substitute a symbolic address for any of the following types of addresses: Element, Member, and Bit.
- When you are entering a symbolic address, you can press the [Insert] key to get a list of symbols that are currently defined. See the PLC-5 A.I. Series Software Reference for more information on using symbolic addresses.
Symbolic addresses are a feature of the software, and are not maintained in the processor. If you use a different computer to monitor the program, you will not have access to the symbols you define. You can copy the ladder logic project (all of the files associated with the project) from one computer to another to maintain the symbols and other descriptions on more than one computer.
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