
B–62755EN/01
8.TROUBLESHOOTING
343
An error is generated in communication with serial pulse coder.
Check the details by the diagnostic function of the CNC.
#7
0202
#6
CSA
#5 #4
PHA
#3
RCA
#2 #1
CKA
#0
SPH
DGN
#7(DTE) Data error has generated.
#6(CRC) Serial communication error has generated.
#5(STB) Stop bit error has generated.
1) #7(DTE):Response from serial pulse coder is absent.
1 Signal cable is disconnected
2 Serial pulse coder is faulty. å See note 1.
3 +5V to the serial pulse coder is lowered.
2) #6(CRC),#5(STB):Serial communication is in faulty
1 Signal cable is disconnected.
2 Serial pulse coder is faulty å See Note 1.
3 Main CPU board or Option 2 board is faulty å See Note 2
CAUTION
1 After the serial pulse coder is changed, reference position
or machine’s standard point is different from the one before
replacement. Therefore reset and adjust it again.
2 All the data stored in memory is lost when the main board
is changed. Set NC data again, referring to “chapter 3 data
input/output”.
8.16
ALARM 351 (SERIAL
PULSE CODER
COMMUNICATION
IS ABNORMAL)
Points
Causes