Converting to User Units Variables and arithmetic operations make it easy to input data in desired user units such as inches or RPM. The DMC-21x2/21x3 position parameters such as PR, PA and VP have units of quadrature counts. Speed parameters such as SP, JG and VS have units of counts/sec. Acceleration parameters such as AC, DC, VA and VD have units of counts/sec2. The controller interprets time in milliseconds. All input parameters must be converted into these units. For example, an operator can be prompted to input a number in revolutions. A program could be used such that the input number is converted into counts by multiplying it by the number of counts/revolution.
Digital Outputs
The DMC-21x2/21x3 has an 8-bit uncommitted output port and an additional 40 I/O (with the addition of the daughter board DB-28040) which may be configured as inputs or outputs with the CO command for controlling external events. The DMC-2152 through DMC-2182 has an additional 8 outputs. Each bit on the output port may be set and cleared with the software instructions SB (Set Bit) and CB(Clear Bit), or OB (define output bit).
Example- Output Bit
The Output Bit (OB) instruction is useful for setting or clearing outputs depending on the value of a variable, array, input or expression. Any non-zero value results in a set bit The output port can be set by specifying an 8-bit word using the instruction OP (Output Port). This instruction allows a single command to define the state of the entire 8-bit output port, where 20 is output 1, 21 is output 2 and so on. A 1 designates that the output is on.
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