FP2 Serial Data Unit
Operation If an Error Occurs
6 − 4
6.1 Operation If an Error Occurs
6.1.2 When the Serial Data Unit ERROR LED Lights
What the ERROR LED does
The ERROR LED on the serial data unit lights there is a problem with communication
between the unit and the external device. There are two ERROR LEDs, [ERR1] and
[ERR2], for each channel.
SDU
SDU
SD RD ERR SD RD ERR ALARM
COM.1 COM.2
ERROR LED
Serial data unit operation when the ERROR LED lights
Operation of the unit continues even if the ERROR LED lights.
If an error occurs during reception, the frame currently being received is cleared, and the
ERROR LED lights. If the next frame is received normally, however, that frame is
processed as a received frame, and the ERROR LED goes out.
CPU unit operation when the ERROR LED lights
Operation of the CPU unit is not affected.
The contents of the error which occurred can be read as I/O contact information, using
the CPU unit.
For an example of a retry program, refer to section 8.1.2.
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