Delta MMC120 - Manual (Page 11)

11
Drive Output
The drive generated by the motion controller is sent through optical isolation to a 12-bit
digital-to-analog converter (DAC). The output from the DAC is amplified to provide a
±10 volt output to the hydraulic valve. Servo valves that need current input require a
voltage-to-current converter (Delta part number VC2100 ). Proportional valves work
directly with the voltage signal.
Quantum Interface
The MMC120 communicates with the Quantum controller over the back plane. The
module is I/O mapped as a DCS MMC 120 0x with four input and four output registers.
Commands and status for both axes are transferred across the back plane in groups of
four 16-bit words.
Programming
Commands to the Motion Controller are sent by writing to the Programmable Controller's
output registers. The first two registers send commands to axis 1 while the next two
registers send commands to axis 2. Programming details are presented in
Communicating with the MMC120 .
Event Control
Sequences of commands can be stored and executed by the Motion Controller with little
intervention by the Programmable Controller. This allows a 1-millisecond response time
by the Motion Controller to internal events such as move done or elapsed time. This is
discussed in Event Control .
FLASH Memory
You can store parameters, profiles, and Event Control steps in the Motion Controller’s
non-volatile FLASH Memory . This reduces the memory requirements in the
Programmable Controller and eliminates the need to transfer initialization parameters
back and forth.
NOTE: Since data is stored in the module, when you replace one module with another
you must transfer the parameters and profiles to the new module. Because of
this, you must store all parameters and profiles either in the control program or
in a monitor program file so they can be transferred to a module when needed.
Starting Up the MMC120
Step-by-Step MMC120 Startup
TIP: Delta’s SSS/10 Servo System Simulator and PPS/14 Position/Pressure