PLC-5/250 (Pyramid Integrator) Item Naming

The format of item names for data from PLC-5/250 controllers matches the naming convention used by the programming software. The general form is as follows:

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

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

$ – Purely optional.

module – PLC-5/250 is comprised of several modules.

Use zero to access items in the RM (Resource Manager).
Use 1 - 4 to access items in specific Logic Processors.
Omit the module number when accessing I/O.

identifier – Identifies the section type. The following table summarizes the supported section types.

file # – File number (0 - 9999 decimal).

If omitted, file 0 is assumed.

element – Element number within the file.

For Input and Output sections, it is also called rack-and-group number, and must be 0 - 377 octal.
For Status section, it must be 0 - 31 decimal.
For all other sections, it must be 0 - 9999 decimal.

.field – Valid only for Counter, Timer, Control, MSG, and PID sections. See the following table.

/bit – Valid for all sections except Floating Point and String.

For Input and Output sections, it must be 0 - 17 octal.
When applied to a Long Integer or a field of a Timer, it may be 0 - 31 decimal.
For all other sections it must be 0 - 15 decimal.