Chapter 9 Troubleshooting 9_ 9-31 Error code Description LED indicator status CPU Module BUS Error FAULT 16#A01C LD/LDI has been used more than nine times. Blinking 16#A01D There is more than one level of nested program structure supported by RPT/RPE. Blinking 16#A01E SRET is used between RPT and RPE. Blinking 16#A01F There is no M102 in the main program, or there is no M2 in the motion program. Blinking 16#A020 The wrong instruction is used, or the device used exceeds the range. Blinking