Epson EM07ZS1647F manual Epson RC+ Master Configuration

4. Troubleshooting (DeviceNet)

♦ Causes of Error

Possible Cause		Examination Method				Countermeasure
{ 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 are connected to
resistors		both ends of the network.				How to find the trouble
{ Cable	(2)	Measure resistance between				point:
disconnection		signal wires with				Remove the terminating
{ Disconnected		communications power				resistor on one end of the
connector		supply OFF.				network. The trouble point
{ Disconnected	→ Normal: 50 to 70 Ω					is where resistance
signal wire	z Measuring point: Connection					changes from 120 Ω.
	of the master
	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.

90 Fieldbus I/O Rev.6