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DMC-3425 Chapter 7 Application Programming• 143
Instruction Interpretation
#Points Label
SP 7000 Speed
AC 80000;DC 80000 Acceleration
#Loop
VP=@AN[1]*1000 Read and analog input, compute position
PA VP Command position
BGA Start motion
AMA After completion
JP #Loop Repeat
EN End
Example - Position Follower (Continuous Move)
Method: Read the analog input, compute the commanded position and the position error. Command
the motor to run at a speed in proportions to the position error.
Instruction
Interpretation
#Cont Label
AC 80000;DC 80000 Acceleration rate
JG 0 Start job mode
BGA Start motion
#Loop
VP=@AN[1]*1000 Compute desired position
VE=VP-_TPA Find position error
VEL=VE*20 Compute velocity
JG VEL Change velocity
JP #Loop Change velocity
EN End
Extended I/O of the DMC-3425 Controller
The DMC-3425 controller offers an option for 64 additional I/O, called the daughter board DB-14064.
This I/O is known as extended I/O and can be configured as inputs or outputs in 8 bit increments
through software. The I/O points are accessed through 2 50-pin high-density connectors.
Configuring the I/O of the DMC-3425
The extended I/O can be configured as outputs in blocks of 8. The I/O is configured as all Inputs by
default. The extended I/O is denoted as blocks 2-9 or bits 17-80.
The command, CO, is used to configure the extended I/O as inputs or outputs. The CO command has
one field:
CO n
where n is a decimal value which represents a binary number. Each bit of the binary number
represents one block of extended I/O. When set to 1, the corresponding block is configured as an
output.
NOTE: The CO command must be sent to slave controllers using the SA command.