NI PXI-8330  Embedded controller

It might be necessary to reset the basis address, especially after a subroutine call, since the subroutine might have selected a different address. The SET instruction should thus be repeated after each subroutine call.“index” need only be specified for field elements and is omitted in all other cases. Changing a SET instruction affects all subsequent addresses down to the next SET instruction. Data element names may then change or become invalid. This may lead to unpredictable reactions in the TML program.

Various types of global data block

s play a central part in the AS 235 system as process image: data blocks for analog values (GA), binary signals/flags (GB, GM) and timers (GT). An address register created for each global data block type accelerates data access and simplifies formulation of multiplexed control sequences. The multiplex address setting instruction “MUX...;“ is used to preset the addresses of these four different types.Element names (elna) are not allocated to the data elements inside the global data blocks; they are identified only by a consecutive number (elno) between 0 and 255. Instead of the preceding dot, the type name of the global data block (GA, GB, GM, GT) without separator must be entered to distinguish the element number 9 in the preset block GB.7 from an arithmetic constant (e.g. 0.9 = zero point nine)

Instructions 

Unlike operators which associate or compare data inside one line, instructions combine several TML files to form a module. This kind of module corresponds exactly to a functional module in a structured chart.

 There are the following instructions (blocks):

 – Subroutine instruction

 – Branching instruction 

– Loop instructions 

– Control step instruction 

– Other instructions

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