Restricted language code

Try to avoid what has been referred to as restricted language code. This makes use of colloquial expressions, very short and simple sentences, repetitive use of conjunctions (but, because, so. .. ) and the use of statements phrased as questions Know what I mean , . . . you know , . . . isn t it , etc. In most patient interactions the use of restricted language code is undesirable however, occasionally you may need to apply it when interacting with certain patients to ensure the information is clearly understood. 

The programming language is function block diagram (a limited variability language). Code development and testing is a well known process. Additionally, there are several restrictions for safety function programming which are described in the system safety manual in detail. 

This bottleneck can be relieved by writing the equations of formation and destruction for each species in full. Doing this by hand would be far too time consuming, and so this subroutine is written by computer. OBLOAD is an equation "hard-wirer", which automatically produces such FORTRAN code for the subroutine DIFFUN, required by GEAR (Nejad, 1986). This produces up to 3000 lines of FORTRAN in 5 minutes on a current scientific workstation computer. DBLOAD takes account of the various terms listed above, and also restrictions imposed by the FORTRAN language, such as length of line and number of continuation lines allowed in one statement. 

In the past, PLC programming languages were limited to simple code (e.g., ladder logic) which is a limited variability language usually having no branching statements. These earlier languages are suitable for use at all SILs with only minor restrictions on the instruction set. 

All four methods will create an object that can be referenced by name but only the first method is an explicit declaration. The other three will create the object implicitly for use only within a restricted section of code, such as a subprogram or loop. The rules governing where a declared object can and cannot be used are similar to those in other programming languages but will be clarified where necessary. The naming of VHDL objects is discussed in Chapter 4. 

The eode in this example illustrates several language features such as die do. end loop, the if... then. .. end loop and a function definition. The code also illustrate some features of the lexical scope of Lua variables wifli the printO statement on line 18. It is noted that variables x, y and z are first introduced within the body of the tst() function definition. However, y is declared as a local variable and is thus known only within the scope of the code block in which it is defined, which in this case is within lines 6 through 13 of the code. The attempt to print the value of y on line 18 thus results in the printed value of nil indicating an unknown value. This illustrates the fact that in Lua, variables are known globally unless restricted to a code block by the local keyword, i.e. die default is that all variables have global scope. 

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