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7.1. General Operation and Function
7.1.15. Target Proximity / In target (NEARA and NEARB)
7.1.15. Target Proximity/In Target (NEARA and NEARB)
l These are control signals that report the Motor is nearing, or in the target zone.
l The parameters NMA and NMB select the target proximity mode or the In-target mode for two
points of NEARA and NEARB respectively.
NEARA
output
NEARB
output
l For the B3 and 23 Driver Units, there are following restrictions for the NEAR output.
1 Target proximity mode (Parameter NMA or NMB is set to NMA0 or NMB0)
l This is to report that the Motor is nearing a target position in positioning with Programmable
Indexer or the RS-232C communication command.
l The criterion of the proximity will be set by NA or NB in unit of pulse.
Figure 7-17: Sequential timing of NEARA and NEARB output (Target proximity mode)
RS-232C command or
RUN input
Motor velocity
Motor position
NEARA output
Target proximity
mode
NMA = 0
NEARB ouput
Target proximity
mode
NMB = 0
NMA = 0
Target proximity mode
NMA ¹ 0
In target mode
NMB = 0
Target proximity mode
NMB ¹ 0
In-target mode
à In case of I/O combination type is besides TY8, the output signal is valid when the
output port setting parameter is OM2.
à In case of I/O combination type is TY8, the output signal is valid when the parameters
are BF0 and OM2.
à It cannot be used with the outputs of BRK/BRKC, NEARA and OVER.
à The output is limited to NEARA only.
Positioning
start
Example: NA20000
Closed
Open
Closed
Open
Sets distance of outputing Target proximity
signal.to parameter NA
Sets holding time to paramter NMA.
Sets output point to parameter ZAS.
Sets end of output point to parameter ZAE.
Sets distance for outputing Target proximity
signal to parameter NB
Sets holding time to paramter NMB.
Sets output point to parameter ZBS.
Sets end of output point to parameter ZBE.
NEARA set point
NEARB set point
Example: NB10000
20000 pulses
10000 pulses
10 ms max
10 ms max
— 7-22 —
B
B
3
3
t
t
y
y
p
p
e
e
B
B
5
5
t
t
y
y
2
3
t
y
p
e
2
5
t
y
2
3
t
y
p
e
2
5
t
y
Target
position
p
p
e
e
p
e
p
e
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