
Glossary
142
DM area
A PC data area in which general operating parameters, speeds, and parame-
ters for positioning actions are stored.
dwell time
A parameter that specifies the period of time during which positioning will
stop before execution of the next positioning action following a positioning
action with a pause completion code.
error code
A four-digit code which is output to a word in the IR area to identify the type
of error which has occurred.
error counter
A device used to ensure positioning accuracy when positioning via pulse
trains. The error counter receives a target position as a specific number of
pulses in a pulse train from the Position Control Unit and outputs analog
speed voltages to drive a servomotor accordingly. The specified number of
pulses in the error counter is counted down by feedback from an encoder
measuring actual motor shaft movement, causing voltage output to stop
when the number of pulses equals zero, i.e., when the target position has
been reached.
external interrupt
A function whereby positioning may be stopped or speed may be changed,
during operation, in response to an external command.
flag
A bit that is turned ON and OFF automatically by the system to provide
status information.
host computer
A computer that is used to transfer data to or receive data from a PC in a
Host Link System. The host computer is used for data management and
overall system control. Host computers are generally small personal or busi-
ness computers.
IN refresh area
The last five of the ten IR words allocated to each Position Control Unit as
refresh areas.
inching
Manual feeding wherein positioning is executed one pulse at a time.
incremental target
position
A target position given in respect to the present position, rather than in re-
spect to the origin.
initial position
The present position when START is executed.
IR area
A PC data area allocated for inputs, outputs, and work bits. In the C200H,
words 100 through 199 of this area are reserved for Special I/O Units, includ-
ing the Position Control Unit. The Position Control Unit uses these words for
I/O refresh areas.
N.C. contacts
Normally-closed contacts. A pair of contacts on a relay that open when the
relay is energized.
Содержание SYSMAC C200H-NC111
Страница 1: ...Cat No W137 E1 04 Position Control Unit SYSMAC C200H NC111...
Страница 2: ...SYSMAC C200H NC111 Position Control Unit Operation Manual Revised September 2003...
Страница 3: ...iv...
Страница 5: ...vi...