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Table 6.7.3 LED status indicator specifications
Status
L.RUN L.ERR SD RD
Operation Status
● ○ ★ ● Normal communications
● ★ ★ ●
Normally communicating. But sometimes a CRC error occurs
due to electrical noise.
● ★ ○ ●
Received data contains a CRC error, so the communications
card cannot respond.
● ○ ○ ● Data destined for this station does not come.
○ ★ ★ ●
Responding to polling. But refresh data received contains a
CRC error.
○ ★ ○ ● Data destined for this station contains a CRC error.
○ ○ ○ ●
No data destined for this station. Or data destined for this
station cannot be received due to electrical noise.
○ ● ○ ●○ Baud rate, station address incorrectly specified.
●
★
(0.8-second
intervals)
★ ● Baud rate or station address changed before completion.
○ ○ ★ ● Link has not been started up.
○ ○ ○ ○
Data cannot be received due to wire break, power down,
hardware reset in progress,
er3
power area failure
: ON, : OFF, ★: Blinking (It may seem to be ON depending on the current transmission baud rate.)
Note 1: If LED lights due to a pattern other than the above, it can be assumed hardware error has occurred.
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