Yaskawa DSD 406 - Manual (Page 105)

Glossary
101 Glossary 3/21/96
Power cube – The MicroTrac DSD chassis and all components mounted on or
inside it. A power cube alone cannot operate a motor; auxiliary items such as
isolation transformer, input circuit breaker, control power transformer and motor
loop contactor are needed to make up a complete MicroTrac DSD drive.
Program upload – The process of a computer sending a new PAC program
(i.e. the .PRG file) To a DSD 406/412 through the drive’s serial port. This
process may be required when, upon application of power, the drive finds the
PAC program loaded into memory is invalid. This process may also be used
when it is desired to change the PAC program from what was previously
loaded. Some of the steps shown below are skipped when the PAC program in
memory is found to be invalid.
Program download – The process of the DSD 406/412 drive sending the PAC
program (i.e. the .PRG file) through the drive’s serial port to a computer. This
process can be used for memory backup.
Queue – A list consisting of values where each new value is entered at the end
of the list and values read from the list are taken from the beginning of the list.
In other words, a first-in first-out [FIFO] buffer.
“RAM” – Random Access Memory. Memory that can be written to as well as
read from. The data in this memory is lost when the power is lost.
RDC – Remote Display Controller LAN Node PCB. A board that includes the
LAN Node circuitry and the software to control what is displayed on each of up
to 31 RDUs. This device also communicates with the drives over the LAN.
RDU – Remote Display Unit. A device that has a 16 character alphanumeric
display and a 5-1/2 digit plus sign numeric display. This device is controlled by
an RDC.
RDU message – The data that is displayed on both displays of the RDU. The
source of the message is defined in the RDC by a Menu Item number, Drive
number, Channel number, Subchannel number, decimal position, a flag stating
what type of message it is (whether the message is modifiable or not), and - if it
is modifiable - the minimum and maximum allowable limits of an entered value.
RIO – Remote I/O [Input/Output] Controller LAN Node PCB. A board that
includes the LAN Node circuitry and the software to control outputs to and
monitor inputs from Remote (Logic or Analog) I/O boards. This device also
communicates with the drives over the LAN.
Scan – This term refers to the frequency at which a particular PAC task will
execute. All PAC tasks programmed in a particular scan will execute in the