Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 30-120 minutes

Alarm 311711

Siemens 311711 - Axis drive transmission length SSI motor measuring system

The configuration of the motor measuring system for an SSI encoder is incorrect: MD 5028 $MD_NO_TRANSMISSION_BITS (SSI frame length) is smaller than the number of all parameterized bits in MD 5021 $MD_ENC_ABS_TURNS_MOTOR (multiturn), MD 5022 $MD_ENC_ABS_RESOL_MOTOR (singleturn) and MD 5027 $MD_ENC_CONFIG bit 14 (alarm bit) and MD 5027 $MD_ENC_CONFIG bit 12 (parity bit) Control reaction: Mode group not ready. Channel not ready. NC Start disable in this channel. Interface signals are set. Alarm display. NC Stop on alarm.

Siemens SINUMERIKServo/AxisIntermediate30-120 minutes

311711

Siemens 311711 - Axis drive transmission length SSI motor measuring system

Axis drive transmission length SSI motor measuring system

The configuration of the motor measuring system for an SSI encoder is incorrect: MD 5028 $MD_NO_TRANSMISSION_BITS (SSI frame length) is smaller than the number of all parameterized bits in MD 5021 $MD_ENC_ABS_TURNS_MOTOR (multiturn), MD 5022 $MD_ENC_ABS_RESOL_MOTOR (singleturn) and MD 5027 $MD_ENC_CONFIG bit 14 (alarm bit) and MD 5027 $MD_ENC_CONFIG bit 12 (parity bit) Control reaction: Mode group not ready. Channel not ready. NC Start disable in this channel. Interface signals are set. Alarm display. NC Stop on alarm.

Safety

  • Drive/power/encoder circuit: hazardous voltages may remain in the DC link after power-off. Lock out / tag out, wait for discharge per the drive documentation, and use qualified personnel only.

Common Causes

  • The configuration of the motor measuring system for an SSI encoder is incorrect: MD 5028 $MD_NO_TRANSMISSION_BITS (SSI frame length) is smaller than the number of all parameterized bits in MD 5021 $MD_ENC_ABS_TURNS_MOTOR (multiturn), MD 5022 $MD_ENC_ABS_RESOL_MOTOR (singleturn) and MD 5027 $MD_ENC_CONFIG bit 14 (alarm bit) and MD 5027 $MD_ENC_CONFIG bit 12 (parity bit)

Troubleshooting Steps

  1. 1Set parameters correctly for all associated machine data: - MD 5028 $MD_NO_TRANSMISSION_BITS (SSI frame length): number of bits in an SSI protocol, including all bits, such as alarm bit/parity bit - MD 5021 $MD_ENC_ABS_TURNS_MOTOR (ultiturn): number of resolvable revolutions - MD 5022 $MD_ENC_ABS_RESOL_MOTOR (singleturn): number of increments per revolution - MD 5027.Bit 12 $MD_ENC_CONFIG.Bit 12: parity bit - MD 5027.Bit 14 $MD_ENC_CONFIG.Bit 14: alarm bit Example: SSI encoder with 25 bits message frame length, 12 bits multiturn, 12 bits singleturn, one alarm bit: - $MD_NO_TRANSMISSION_BITS = 25 - $MD_ENC_ABS_TURNS_MOTOR = 4096 - $MD_ENC_ABS_RESOL_MOTOR = 4096 - $MD_ENC_CONFIG.Bit 14 = 1 - $MD_ENC_CONFIG.Bit 12 = 0
  2. 2Switch control OFF - ON

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