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10-1 Procedure
Error processing is facilitated by the ERROR LED on the Position Control
Unit and error code displays on the External Display. The following figure de-
scribes the different error processing steps. The three types of errors, system
errors, command/data errors, and communications errors, are further classi-
fied by their unique error codes (Refer to
Appendix D
). In addition, the ER-
ROR LED on the Position Control Unit lights when there is a system error or
command error and flashes when there is a communications error.
Transfers correct
command or
data.
Communications
error
Error occurs
Error clears
Command or
data error
System error
Correct the
error.
ERST
ERST
10-2 Basic Troubleshooting
If an error occurs, the following general procedure should be used.
1, 2, 3...
1.
Check the LED status on the Position Control Unit front panel and the
flag status.
2.
If possible, determine the cause of the error. Check the error code.
3.
Correct the cause of the error.
4.
Reset the Position Control Unit (ERST).
10-3 System Errors
Caused by reasons other than PC commands. System errors have error
codes 00-21 (See
Appendix D
). Possible problem areas include Position
Control Unit internal hardware, the watchdog timer, the workpiece travelling
beyond the CW or CCW limit switch, error counter overflow, and emergency
stop. Any of the errors cause the stored origin to be lost. After resetting, be-
gin by establishing the origin.
10-4 Command/Data Errors
Caused by PC commands. Command errors are further classified as OP
code errors with codes 30-33, operand errors with codes 40-41, and data
errors with codes 50-61 (See
Appendix D
). Possible problem areas include
incorrect command or data format, commands received at the wrong time
(e.g., SRT before ORG), and undefined data.
10-5 Communications Errors
Caused by abnormal data communications with Peripheral Devices such as
the Teaching Box or External Display. Communication errors have codes
70-72 (See
Appendix D
). Problem areas are parity errors, framing errors, and
overrun errors.
Communications Errors
Section 10-5
Содержание SYSMAC C500-NC222-E
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