Yaskawa DSD 406 - Manual (Page 99)

Glossary
95 Glossary
3/21/96
Glossary A/D – Analog to Digital converter.
Active Hub – A central component in LAN star networks that ensures data
integrity over distances of up to 2000 feet by regenerating the network signal.
Active menu item – The menu item for an RDU that will be used to get the
source of the information to be displayed. When a menu item number is
selected, the Control/Display Unit (CDU) menu item data will be used; if there is
no data in the CDU menu item for the selected menu item number, then the
default menu item data is used.
Active Link – A device that interconnects two LAN bus networks.
ANIO – Remote Analog I/O [Input/Output] PCB.
Broadcast message – A type of LAN message which is capable of being
received by all nodes on the LAN. The message contains the source of the
message, but the destination is all nodes that have been enabled to receive
broadcast messages.
CDU – Control/Display Unit. There are two CDUs supported for the MicroTrac
DSD drive: the Standard CDU (see SCDU definition) and the Portable CDU (see
PCDU definition).
CDU menu item – A menu item of an RDU that was built by using the PCDU.
Channel – The second level address used to further define the location of
information external to the the PAC environment (the first level of addressing
being the Node number - see NODE definition). To access information external
to the PAC environment requires reference to that information by an address
which includes all levels of addressing defined for that particular information.
That is, to use a Channel number also requires the associated Node number such
as Node 50, Channel 21. The system will support a maximum of 256 (0 through
255) Channel numbers.
Complex PAC task – Any of the more complicated PAC functions (as opposed
to the simpler elemental functions), which consists of two (or more) interrelated
PAC tasks. These interrelated tasks are referred to as segments. Each segment is
a self-contained module which executes sequentially, although each segment
executes separately. The interrelated segments exchange information between
each other which has predefined significance. The various segments need not be
programmed in a common scan (see SCAN definition).
An example of a complex task would be SPDR, the speed regulator task, which
consists of two related segments. One segment executes in the fast scan, and
consists of the actual function of regulating the speed by comparing the speed