SLC-500 item naming

The general format of item names for data from SLC-500 controllers matches the naming convention used by the programming software. The format is as follows:

[$] identifier [file #] : element [.field] [/bit]

Note: The parts of the name shown in square brackets ([]) are optional.

$ – Purely optional.

identifier – Identifies the file type. The following table summarizes the valid file types, the default file number for each type, and the .fields allowed (if any).

file # – Identifies the file number.

File numbers 0 - 8 decimal are reserved for predefined file types as listed in the table.
All other file numbers, 9 - 255 decimal, are open to all file types.

element – Element number within the file.

For Input and Output files, it must be 0 - 30 decimal.
For all other file types, it must be 0 - 255 decimal.

.field – Valid only for Counter, Timer and Control files; see the following table.

/bit – Valid for all file types except ASCII String and Floating Point.

Must be 0 - 15 decimal.

*Available only on certain SL-500 models. Check the Processor Manual for the model being used.