10 TROUBLESHOOTING
(a)When a communication error occurs, take corrective action according to Section 10.3.
(b)The initial status of the LED ON and communications error indicates the status when the Q series C24 starts up by turning on the power or resetting the PLC CPU.
(c)Each of the communications error status, C/N to SIO, CH1 ERR. and CH2 ERR., turns on when an error occurs, and keeps its
The PLC CPU can check the aforementioned LED ON status and communications error status, and initialize any error information using read/write to the buffer memory of the Q series C24 and input/output signals. Initialize the error information according to Section 10.1.2.
(d)NAK to NEU. (No. 6 to 8) turn on/off depending on the status.
(e)SD WAIT turns on when data cannot be sent to the external device by the transmission control of the Q series C24 (waiting for data transmission).
•When transmission cannot be started.
•When a transmission pause request is received during data transmission. (DSR signal is off, reception by DC3)
SD WAIT turns off when transmission becomes possible and data transmission is started/resumed.
10 - 5 | 10 - 5 |