Trouble Shooting, Mod/Net Led | SMC Networks EX122-SDN1, EX120-SDN1

6. Trouble Shooting

SMC CORPORATION Doc.No.EX##-OME0015

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.

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EX120-SDN1, EX122-SDN1, EX121-SDN1, EX124D/U-SDN1 specifications

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