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166 • Chapter 7 Application Programming DMC-1700/1800
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/revoluti
on.
Example:
#RUN Label
IN “ENTER # OF REVOLUTIONS”,N1 Prompt for revs
PR N1*2000 Convert to counts
IN “ENTER SPEED IN RPM”,S1 Prompt for RPMs
SP S1*2000/60 Convert to counts/sec
IN “ENTER ACCEL IN RAD/SEC2”,A1 Prompt for ACCEL
AC A1*2000/(2*3.14) Convert to counts/sec2
BG Begin motion
EN End program
Hardware I/O
Digital Outputs
The DMC-1700/1800 has an 8-bit uncommitted output port for controlling external events. The DMC-1750
through DMC-1780 or DMC-1850 through DMC-1880 have an additional 8 outputs. [The DMC-17X8 has an
additional 64 I/O (configured as inputs or outputs with CO command)]. 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).
For example:
INSTRUCTION FUNCTION
SB6 Sets bit 6 of output port
CB4 Clears bit 4 of output port
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.
INSTRUCTION FUNCTION
OB1, POS Set Output 1 if the variable POS is non-zero. Clear Output 1 if POS equals 0.
OB 2, @IN [1] Set Output 2 if Input 1 is high. If Input 1 is low, clear Output 2.
OB 3, (@IN [1]&@IN [2]) Set Output 3 only if Input 1 and Input 2 are high.
OB 4, COUNT [1] Set Output 4 if element 1 in the array COUNT is non-zero.
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 2
0
is output 1, 2
1
is output 2 and
so on. A 1 designates that the output is on.
For example:
INSTRUCTION FUNCTION
OP6
Sets outputs 2 and 3 of output port to high. All other bits are 0. (2
1
+ 2
2
= 6)
OP0 Clears all bits of output port to zero
OP 255 Sets all bits of output port to one.
(2
2
+ 2
1
+ 2
2
+ 2
3
+ 2
4
+ 2
5
+ 2
6
+ 2
7
)
The output port is useful for setting relays or controlling external switches and events during a motion sequence.