Omron CS1W-ETN21 operation manual Troubleshooting with Indicators, Probably cause Correction

Troubleshooting with IndicatorsSection 8-1

8-1	Troubleshooting with Indicators
				The indicators on the Ethernet Unit can be used to troubleshoot some error.
				The probable cause and correction for errors that can be determined from the
				LINK, HOST, RUN, ERC, and ERH indicators are listed in the following table.
RUN	ERC	ERH	LNK	HOST	Probably cause	Correction
Not lit	Not lit	Not lit	---	---	Power is not being supplied to the CPU	Supply power.
					Unit or the power supply voltage is too	Make sure that the correct voltage is
					low.
						being supplied.
					The Ethernet Unit is faulty.	Replace the Ethernet Unit.
					The CPU Unit or Backplane is faulty.	Replace the CPU Unit or the Back-
						plane.
					The mounting screws on the Ethernet	Tighten the mounting screws to the
					Unit are loose (CS Series) or the sliders	specified torque (CS Series) or lock
					are not properly locked into place (CJ	the sliders into place (CJ Series).
					Series).
Not lit	Lit	Not lit	---	---	The node address is set outside the cor-	Set the node address to between 01
					rect range on the rotary switches.	and FE Hex.
					The Ethernet Unit is faulty.	Restart the PLC. If the problem per-
						sists, replace the Ethernet Unit.
Not lit	Not lit	Lit	---	---	The unit number on the Ethernet Unit is	Correct the unit number setting.
					not set correctly on the rotary switch.
					The I/O tables are not registered in the	Register the I/O tables.
					CPU Unit.
					The same unit number is being used on	Correct the unit number.
					another Unit as well.
					The CPU Unit is faulty.	Restart the CPU Unit. If the problem
						persists, replace the CPU Unit.
Lit	---	---	Not lit	---	There is no communications link with the	If power is not turned ON to the hub,
					hub.	turn it ON.
						If there is crossed cable between the
						Ethernet Unit and the hub, use
						straight cable.
Lit	---	Lit	---	---	There is a mistake in the Unit Setup or	Read the error history and correct
					routing tables.	the data that is causing the error. If
						the problem persists, replace the
						CPU Unit.
					Memory in the CPU Unit is faulty.	Restart the CPU Unit. If the problem
						persists, replace the CPU Unit.
					The CPU Unit is faulty.	Restart the CPU Unit. If the problem
						persists, replace the CPU Unit.
				Lit	There is a mistake in the settings for a	Read the error status and history
					server (DNS, SMTP, POP3, or SNTP) in	and correct the data that is causing
					the Unit Setup.	the error. If the problem persists,
						replace the CPU Unit.
		Not lit	---	Lit	An error occurred in communications with	Inspect the communications path
					the server.	(Ethernet Unit, cable connections,
						hub, router, server), and correct the
						situation that is causing the error.
Lit	Lit	---	---	---	An error occurred in EEPROM.	Restart the PLC. If the problem per-
						sists, replace the Ethernet Unit.

200