Difference between revisions of "MC-Basic:SYSTEM.DIN"
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Revision as of 14:20, 28 May 2014
This property reads the value of one or more of the 23 digital inputs. The variable contains the values of the individual bits in the system input word. As there are 23 inputs, the 9 most significant bits of the word are all zero. When SYSTEM.DIN is qualified by a bit number, only that input bit is read. SYSTEM.DIN returns the value 1 or 0, depending on the value of the input.
If a single bit is being accessed, the argument (or value) must have the value 1 or 0.
When several successive bits are accessed (through the double-index format), the returned value is composed of all the bits’ values within the defined range.
Syntax
System.Din
Sys.Din
? System.Din
?System.Din.<bit number>
?System.Din[<bit number>]
?System.Din[<bit number>][<range>]
Availability
All versions
Type
A query returns a Double value.
Range
Decimal: 0 to 8 388 607 (223 –1)
Hex: 0x0 to 0x7FFFFF
<bit number>: 1 to 23
<number of bits>: 1 to 32
Default
0, when no external device is connected.
Scope
Configuration, Task or Terminal
Limitations
Read only
Examples
MyVar = System.Din ‘MyVar is assigned the value of the input word
MyVar = System.Din.3 ‘MyVar is assigned 0 or 1, according to the value of the input bit number 3.
MyVar = System.Din[3] ‘MyVar is assigned 0 or 1, according to the value of the input bit number 3.
MyVar = System.Din[3][4] ‘MyVar is assigned by the values of the input bits 3, 4, 5 and 6.