Sinumerik Alarm 301711 Axis %1 drive %2 transmission length SSI motor measuring system invalid
Parameters:
%1 = NC axis number
%2 = Drive number
Definitions:
The configuration of the motor measuring system for an SSI encoder is incorrect: MD_1028 $MD_NO_TRANSMISSION_BITS (SSI transmission length) is less than the number of all parameterized bits in MD_1021 $MD_ENC_ABS_TURNS_MOTOR (multi- turn), MD_1022 $MD_ENC_ABS_RESOL_MOTOR (singleturn) and MD_1027 $MD_ENC_CONFIG bit 14 (alarm bit) and MD_1027 $MD_ENC_CONFIG bit 12 (parity bit).
Reactions:
– Mode group not ready.
– Channel not ready.
– NC Start disable in this channel.
– NC Stop on alarm.
– Alarm display.
– Interface signals are set.
Remedy:
• Set parameters correctly for all associated machine data:
• MD_1028 $MD_NO_TRANSMISSION_BITS (SSI transmission length): number of bits in an SSI protocol, including all bits, such as alarm bit/parity bit
• MD_1021 $MD_ENC_ABS_TURNS_MOTOR (multiturn): number of resolvable revolutions
• MD_1022 $MD_ENC_ABS_RESOL_MOTOR (singleturn): number of increments per revolution.
• MD_1027.Bit 12 $MD_ENC_CONFIG.Bit 12: parity bit
• MD_1027.Bit 14 $MD_ENC_CONFIG.Bit 14: alarm bit
• Example:
• SSI encoder with 25 bits transmission 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
Program Continuation:
Switch control OFF – ON.
References
- Siemens Diagnostics Guide by Siemens