NI PXI-2546 Relay module

Definition of data elements Each data element (each input, each output and each internal parameter) requires an element instruction. EL,elno,elna,datatype:fieldlg,C,B,Q,N,X=elno; elno: Consecutive data element number (element number). The data element definition can be performed in any sequential order. elna: Mnemonic name of the data element (element name); max. 4 characters starting with a letter. Only the first two characters of operator–controllable data elements (attribute B) are interpreted. Names which are invalid in NEMO may not be used (cf. Chapter 10.7.1). If the element name is to be parameterized, i.e. variable, indirect name assignment is used for ’elna’.

Attributes of the data element 

The attributes are specified as code letters or as a code instruction; they may be omitted individually. C If this data element is parameterized and accessed by the operator, the CHECK block of the same block type is executed before the value is entered (with interconnection only if Q has been set). An error message (F 412) is issued and the value entered if the CHECK block has not yet been defined.  The CHECK function is not executed when – a value is entered by TML blocks – a value is entered by EAR/EBR blocks – the computer performs a parameter access and the write message contains more than one parameter.

An operator control of the data element is possible; 

the first two characters of its name are displayed on the process communication keyboard after the block has been selected and “BE;“ entered. The block header also contains a code which indicates that the block is operator–controllable. This means that a block containing a B attribute in at least one element will always be marked as operator–controllable, and will always be superimposed in the process communication keyboard, even after the B attribute has been removed from all data elements. The type must be suppressed in FB.ORPA if this function is to be stopped. Q This data element must be an address, i.e. it must be interconnected (Q instruction). This is only expedient with EB, EA, EAD. N This data element should not be configurable; the operator inputs P,... and Q,... are inhibited. Internal parameters are inhibited in parameterization. Write access operations from TML are allowed and are executed.

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