Input Signals Required For An Origin Search; Origin Search Methods And Parameters - Omron CS1W-MC221 - 02-2008 Operation Manual

Input Signals Required for an Origin Search

Name Model
Absolute MC421
Origin Set MC221
Origin MC421
Search MC221
9-2 Input Signals Required for an Origin Search
CW and CCW Limit
Signals
Origin Proximity Signal
Encoder's Phase-Z Signal
9-3

Origin Search Methods and Parameters

9-3-1 Origin Search Methods
Set Origin at Power ON
Mode
Reverse Mode
One-direction Mode
468
Word
X axis Y axis
n+11 n+13
n+7 n+9
n+11 n+13
n+7 n+9
Refer to 5-3 PLC Interface Area for details on these bits. For details on setting
up the absolute encoder from the Teaching Box, refer to the Teaching Box
Operation Manual (W320).
The following signal inputs and conditions are required to perform an origin
search.
Signal
CW and CCW limit signals
Origin proximity signal
Encoder's phase-Z signal
These signal inputs indicate that the workpiece's maximum range, for clock-
wise (CW) or counterclockwise (CCW) motor rotation, has been reached.
This signal input indicates that the axis is near the origin.
This signal is output when the encoder has made one revolution. Two phase-Z
signals are output per revolution in the case of OMRON M-series Servomo-
tors.
The first phase-Z position after the origin proximity signal input changes from
ON to OFF is the actual workpiece origin.
There are three possible settings for the origin search method.
The origin is automatically set to the motor's position when power is turned
ON.
If origin search is performed in this mode, the Unit will search for the position
of the motor at power ON.
The direction is reversed if a limit signal input is received during the origin
search.
The origin will be established when the phase-Z signal goes ON after the ori-
gin proximity signal input goes from ON to OFF (normally open input).
When there is no origin proximity signal input, a limit signal input can be used
instead.
The origin search is performed in just one direction. An error will occur if a
limit signal input is received before the origin proximity signal input.
Z axis U axis
n+15 n+17
--- ---
n+15 n+17
--- ---
Normally closed inputs are required.
The logic of this signal can be changed in the machine
parameters, so either normally closed or normally
open inputs can be used.
The MC Unit detects the signal when it changes from
Low to High.
Section 9-2
Bit Description
06 : Sets the absolute origin.
01 : Executes origin search.
Description