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MCX514 -
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2.12.5 Interface to Servo Motor Driver
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nINPOS signal and nALARM signal
As the input signals for connecting a servo motor driver, there are the nINPOS signal (in-position input signal) and the nALARM
signal (alarm input signal).
The user can set each signal to enable/disable and the logical level by D9~6 bits of WR2 register. For more details of the WR2
register, see chapter 6.6.
nINPOS input signal responds to the in-position signal of a servo motor driver. When set to enable, and if nINPOS becomes active
after driving is finished, D3~0 bits (n-DRV: Driving status) of RR0 (main status) register will return to 0.
nALARM input signal receives the alarm signal from a servo motor driver. When set to enable, it monitors nALARM signal
during the driving, and when nALARM becomes active, driving will stop instantly. At this time, D4 (ALARM) and D14
(ALARM) bits of RR2 register become 1.
The status of these input signals from a servo motor driver can be read out from RR3 register Page0 anytime.
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Deviation counter clear output signal
A Deviation counter clear signal (nDCC) is available as a servo motor driver output signal.
The logical level of a deviation counter clear signal (nDCC) and pulse width can be set by D3~6 bits of automatic home search
mode setting 2 command (24h). For more details of the automatic home search mode setting 2 command (24h), see chapter 7.3.5.
When deviation counter clear output command (72h) is written, deviation counter clear pulses are output based on the logical level
of pulses and pulse width set by automatic home search mode setting 2 command (24h).
In the case of using the deviation counter clear signal (nDCC) in automatic home search, see chapter 2.5.2 and 2.5.4.
2.12.6 Emergency Stop
MCX514 has the input signal EMGN that can perform the emergency stop function during the driving of all 4 axes. Normally, this
signal is kept on the Hi level. When it falls down to the Low level, all axes which drive will stop immediately and D5 (EMG) and
D15 (EMG) bits of RR2 register become 1. Please note that there is no way to select the logical level of EMGN signal.
There are the following methods to perform the emergency stop to function for 4 axes from the host CPU.
a. Write an instant stop command to 4 axes
Specify all 4 axes to WR0 register and then write instant stop command (57h).
b. Write a command reset
Write 00FFh into WR0 register, and it will be reset.