PLC-5 item naming

$

Purely optional.

X

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

File number (0 - 999 decimal).

• File 0 must be Output.

• File 1 must be Input.

• File 2 must be Status.

element

Element number within the file.

• For Input and Output files it is also called rack-and-group number and must be 0 - 777 octal.

• For all other file types, it must be 0 - 999 decimal.

.field

Valid only for Counter, Timer, ASCII String, PID, SFC Status, Block Transfer, and Control files.

Refer to the following table.

/bit

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

• For Input and Output files it must be 0 - 17 octal.

• For all other file types it must be 0 - 15 decimal.