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6. Trouble Shooting
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MOD/NET LED Cause & Countermeasure
Lights off PWR LED lights off
<Countermeasure>
Confirm that power for SI unit circuit is supplied.
Confirm correct wiring.
If above countermeasures do not improve status, please exchange SI unit.
PWR LED lights up
<Countermeasure>
Confirm that baud rate is set correctly.
If MOD/NET LED lights off in spite of baud rate is set correctly, change SI unit.
Green flashing Connection waiting
Shows communication waiting status between SI unit and master.
<Countermeasure>
Confirm master operate correctly.
If using scan list, ensure slave is recorded to scan list correctly.
Red flashing Communication wire disconnected error
<Countermeasure>
Confirm communication wire is not disconnected.
<Remark>
Red flashing if master power source is turned off during communication.
Red lights up Node address overlapping error
<Countermeasure>
Confirm there is no overlapping on the node address.
BUS OFF error
Detects communication error.
<Countermeasure>
Case 1
Communication error due to noise.
Confirm there is no component or high voltage cable that generate noise
around communication wire.
Make some distances between communication wire and noise source.
Case2
Communication cable problem.
Confirm terminal resistance (121ohm) connects to the both ends of
communication wire that is main wire of communication wire.
If red MOD/NET LED is still lights up in spite of above countermeasures,
change SI unit.
CAUTION
When red MOD/NET LED is lit, even if cause is solved, SI unit do not do auto-recovery. In
this case, please reset the power to SI unit circuit (Communication/Internal power supply).
SI unit isn’t available for monitoring of power supply for solved valve.
SMC CORPORATION
Doc.No.EX
##-OME0015