IAI America SCON-C - Manual (Page 178)

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3.2.9 Feedback-pulse Output Signals (AFB•/AFB, BFB•/BFB, ZFB•/ZFB, GND)
Data of detected positions are output using differential pulses.
Function
Data of detected positions are output using differential pulses (phases A, B and Z). The host controller can read
the current actuator position in real time using a counter function, etc.
 Related parameter
The resolution of output pulses is determined based on the electronic gear ratio of input pulses set by the
applicable position control parameters, where the resolution of output pulses is the same as that of command
pulses.
A desired feedback-pulse output pattern can be set using the user parameter for feedback pulse pattern.
These pulse signals can be disabled using user parameter No. 68, “Enable/disable feedback pulses.”
Set this parameter to “Disable” if the feedback pulses are not used.
Caution:
 If these signals are to be read by the host controller to set a closed loop, set a logically consistent
sequence to implement the applicable processing.
 If the actuator encoder is not a serial encoder, the phase-Z signal is output directly.
If the actuator uses a serial encoder, the phase-Z pulse is output within a mechanical-angle range of
0.5 from the zero (home) position. Based on the communication cycle with the encoder, this
precision can be assured when the motor speed is 100 rpm or below.
3.2.10 Emergency Stop Status (*EMGS)
The status is ON under normal conditions, but is turned OFF if the emergency stop switch is pressed.
Monitor the OFF status of this signal on the PLC side and take appropriate safety measures for the entire device.