Epson EM07ZS1647F manual Check for cable laying Check that

4. Troubleshooting (DeviceNet)

♦Process Flowchart

Check for cable laying.

Check that		Problem exists.
terminating resistors
are connected.	(Add terminating resistors.)

Normal

Turn OFF communications power supply.

Measure resistance			Out of 50 to 70 Ω (Error)
with tester.
50 to 70 Ω
	Normal			Resistance: over 70 Ω		No
					Yes				Under 10 Ω
See 4.1.3.2.						Resistance: under 50 Ω
				Remove one terminating
				resistor on either side.			10 to 50 Ω
						Check for	connection
									Check	for short
				Measure		with terminating resistors			circuit	between
		Approx.				and branch taps.			signal wires.
		120	Ω	resistance at		(1) Three	or	more
				connectors and					Short		circuit
				branch taps with		terminating resistors			between signal
				tester.		(2) Wrong	terminating		wires
						resistors, etc.

Other

Find the trouble point.

(1)Unconnected or loose connector

(2)Cable disconnection, etc.

Fieldbus I/O Rev.6 99