Epson EM07ZS1647F manual Loose Connector Signal Wire

4. Troubleshooting (DeviceNet)

♦ Causes of Error								Countermeasure
	Possible Cause		Examination Method
	{ Voltage drop of	Measure voltage of						Check voltage of the power
	communications	communications power supply at						supply.
	power supply	the master unit.
		→ Normal: 11V or more between
		V+ and V-
		z If the voltage is 11 to 14 V, the
		master unit is a possible cause.
		Fix the problem on it.
	{ Disconnected	(1)	Check that terminating					Fix the problem.
	terminating resistors		resistors are connected to
	{ Cable disconnection		both ends of the network.					How to find the trouble
	{ Disconnected	(2)	Measure resistance between
								point:
	connector		signal wires with
								Remove the terminating
	{ Disconnected signal		communications power
	wire		supply OFF.					resistor on one end of the
		→ Normal: 50 to 70 Ω						network. The trouble point
		z Measuring point: Connection						is where resistance
		of the master						changes from 120 Ω.
		z For detail, refer to the section
		4.1.3.1 Connection Problem.
	{ Loose connector	Check for the connection of						Connect the connectors
	{ Loose signal wire	connectors and signal wires.						and signal wires again.
		→ The connectors and signal
		wires		should	be	firmly
		connected.
		z Checkpoint: Between the
		master and its slaves
		z For details, refer to the section
		4.1.3.2		Loose Connector			and
		Signal Wire.
	{ All slaves power	Measure the power voltage of the						Supply power to the slaves.
	OFF	slaves.
		(It should be within the range of
		sufficient voltage for slave
		operation.)
	{ Master unit	(1)	Start	applicomIO		Console		Change the configuration.
	configuration		application and		check		that
			the	configuration		has	no
			difference with		the	network
			condition.
		(2)	Check that the configuration
			data were written in flash.
		z For details, refer to the section
		4.1.3.6 EPSON RC+ Master
		Configuration.

Fieldbus I/O Rev.6 97