3.8 Special Wiring1513.8.5 Using an Absolute Encoder1) OutlineAn absolute value detection system detects an absolute position of the machine evenwhen the servo system is OFF. If such a system is to be formed in the host controller, usean SGM or SGMP Servomotor with absolute encoder. Consequently, automatic opera-tion can be performed without zero return operation immediately after the power is turnedON.SGMjjjW1j(SGMPjjjW1j)Always detectsabsolute positionZero returnoperation12-bit absolute encoder2) Standard Connection Diagram for a 12-bit Absolute Encoder Mounted on a Servo-motor• Interface CircuitHost controllerBatteryLine receiverSerialinterfacecircuitClear Up/downcounterDe-coderServopack Servomotor12-bit absolute encoderRepresents twisted pairwiresSerialinterfacecircuitSGBAT+BAT-FG 1CN-501CN-11CN-491CN-481CN-201CN-191CN-361CN-351CN-341CN-331CN-221CN-211CN-21CN-4Line Receiver Used: SN75175 or MC3486 manufactured by Texas Instruments Inc.Termination Resistor R: 220 to 470 ΩNormally, PAO serial data is used. In this case, PS serial interface is unnecessary.3
