Sigma II User’s Manual Chapter 5: Parameter Settings and Functions5-705.5 Forming a Protective SequenceThis section describes the procedure for using I/O signals from the servo amplifier to forma protective safety sequence.5.5.1 Using Servo Alarm and Alarm Code OutputsThe basic procedure for connecting alarm output signals is described below.A suitable external I/O power supply must be provided by the user separatelybecause there is no internal 24V power supply in the servo amplifier.The use of the photocoupler output signals is described below.These alarms are output when a servo amplifier alarm is detected.Form an external circuit so this alarm output (ALM) turns OFF the servo amplifier.Output ALM+ CN1-31 Servo Alarm Output Speed/Torque Control,Position ControlOutput ALM- CN1-32 Signal Ground for Servo Alarm Output Speed/Torque Control,Position ControlState Status ResultON Circuit between CN1-31 and 32 is closed, andCN1-31 is at low level. Normal state.OFF Circuit between CN1-31 and 32 is open, andCN1-31 is at high level. Alarm state.Photocoupler output levels per output node:• Maximum operating voltage: 30VDC• Maximum output current: 50mADCOpen collector output levels per output node:• Maximum operating voltage: 30VDC• Maximum output current: 20mADCAL01ALM-AL02AL03ALM+SGHost controllerServo amplifierPhotocoupler CN1-31CN1-32CN1-37CN1-38CN1-39CN1-10V 0V50mA(maximum)20mA(maximum)I/O power supply+24V 0VTurns power OFF.AlarmdetectionServo amplifierALM output
