Echelon NodeBuilder Errors 3120 User Manual download pdf (Page 40)

5-20 Neuron C Compiler Errors (NCC)

NCC# Description

147 Type defaults to ‘int’ [NCC#147]

The definition of ANSI C permits a declaration at file scope without a

type. Likewise, functions may be declared without a return type.

Such declarations must default to int, by the ANSI definition.

However, such declarations are poor programming practice, and may

even indicate an error, thus the compiler issues a warning

diagnostic.

Consider the following example:

unsigned long x1, x2; x3;

Note the semicolon following x2. This is most likely a typographical

error, however, ANSI C permits this and results in x3 being declared

by default as an int. Due to white space rules, this appears the same

to the compiler as the following declaration:

unsigned long x1, x2;

x3;

This is almost certainly not what the programmer intended, yet most

C compilers do not issue a warning in these circumstances.

148

149

Class ‘config’ can only be used with network variables

[NCC#148]

Class ‘config’ applies only to ‘input’ variables [NCC#149]

The config keyword only applies to input network variables.

However, in Neuron C Version 2, use of the config_prop (or cp)

keyword declares a fully managed configuration property, whereas

the config keyword declares a legacy configuration network

variable. The legacy variable requires that the programmer must

manually code the SD information necessary to make the config

network variable known to a network management tool. More

information on configuration properties can be found in the Neuron C

Programmer’s Guide and the Neuron C Reference Guide.

150 Cannot re-declare ‘bind_info’ [NCC#150]

The bind_info modifier can appear at most once in the declaration of

a network variable or a message tag. The bind_info cannot be

combined with other bind_info by concatenation.

151 I/O function call requires arguments [NCC#151]

Insufficient arguments (or no arguments) were passed to the I/O

built-in call flagged by the compiler diagnostic. All I/O functions

require at least one argument, namely the I/O object name.

152 Name is not an I/O object name [NCC#152]

The first argument passed to the flagged I/O built-in call is not a

properly declared I/O object name. Note that in ANSI C, a general

rule is that an object must be declared before its first use.

153 I/O function not valid for this I/O object [NCC#153]

Some built-in functions, such as io_set_clock( ) and io_select( ),

cannot be used on all I/O object types.

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