Sinumerik Alarm 301714 Axis %1 drive %2 transmission length SSI direct measuring system invalid
Parameters:
%1 = NC axis number
%2 = Drive number
Definitions:
Configuration of the direct measuring system is faulty for SSI encoder: MD_1041 $MD_NO_TRANSMISSION_BITS_DM (SSI transmission length) is smaller than the number of all parameterized bits in MD_1031 $MD_ENC_ABS_TURNS_DIRECT (multiturn), MD_1032 $MD_ENC_ABS_RESOL_DIRECT (singleturn) and MD_1037 $MD_ENC_CONFIG_DIRECT Bit 14 (alarm bit) and MD_1037 $MD_ENC_CONFIG_DIRECT 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_1041 $MD_NO_TRANSMISSION_BITS_DM (SSI transmission length): number of bits in an SSI protocol, including all bits such as alarm bit and parity bit.
• MD_1031 $MD_ENC_ABS_TURNS_DIRECT (multiturn): number of resolvable revolutions
• MD_1032 $MD_ENC_ABS_RESOL_DIRECT (singleturn): number of increments per revolution
• MD_1037.Bit 12 $MD_ENC_CONFIG_DIRECT.Bit 12: parity bit
• MD_1037.Bit 14 $MD_ENC_CONFIG_DIRECT.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_DM = 25
• $MD_ENC_ABS_TURNS_DIRECT = 4096
• $MD_ENC_ABS_RESOL_DIRECT = 4096
• $MD_ENC_CONFIG_DIRECT.Bit 14 = 1
• $MD_ENC_CONFIG_DIRECT.Bit 12 = 0
Program Continuation:
Switch control OFF – ON.
References
- Siemens Diagnostics Guide by Siemens