Omron CQM1H-SCB41 operation manual 122

Board Replacement					Section 9-2
Serial com-	Indicator	Status	I/O memory	Cause	Remedy
munications	status	information,
mode		etc.
Serial commu-	---	---	Bits 12 to 15 (Serial	Serial communica-	Set bits 12 to 15 of
nications mode			Communications	tions mode is not	DM 6555/DM 6550 to
is not set to			Mode) of	set correctly.	0 Hex. (Host Link).
Host Link.			DM 6555/DM 6550
			are set to a value
			other than 0 Hex.
Serial commu-	The COMMj	---	---	Cables are incor-	Check the wiring.
nications mode	indicators do			rectly connected.
is set to Host	not flash at all.			The RS-422A/485	Reset the port to the cor-
Link.	(Communica-
				port setting (2-wire	rect wiring setting.
	tions have not
				or 4-wire) is incor-	Wire all nodes using the
	been electrical-
				rect (WIRE).
	ly established.)				4-wire method.
				Adapters such as
				the NT-AL001-E
				are incorrectly
				wired or set.
				Commands are not	Reset the serial commu-
				being set from the	nications port at the host,
				host.	and rewrite the program.
				There is a hard-	Replace the Serial Com-
				ware error.	munications Board.
	The COMMj	There is no	IR 20100 to	The PC Setup set-	Reset the settings in the
	indicators are	transmission	IR 20103 or	tings for the Host	PC Setup for the Host
	flashing, but	error.	IR 20108 to	Link unit No., Host	Link unit No., Host Link
	the response		IR 20177 are	Link transmission	transmission delay and
	has not been		0 Hex.	delay, or other set-	other settings so that they
	returned to the			tings do not match	match the settings at the
	host. (Commu-			the settings for the	host device.
	nications have			remote device.	Correct the command
	been electrical-
				The command for-	frame (header, Host Link
	ly established.)
				mat and data	Unit No., terminator, etc.)
				length of the data	and the program.
				sent from the host
				are incorrect.
			---	Cables are incor-	Check the wiring and
				rectly connected.	switch settings, and cor-
				The RS-422A/485	rect if necessary.
				port setting (2-wire
				or 4-wire) is incor-
				rect (WIRE).
				Adapters such as
				the NT-AL001-E
				are incorrectly
				wired or set.
			---	This is a transmis-	Conduct a loopback test
				sion circuit hard-	in serial communications
				ware error.	mode to check the trans-
					mission lines. If an error
					occurs during the test, re-
					place the Serial Commu-
					nications Board.
				The send delay	Reset the parameters in
				time setting is too	the PC Setup correctly.
				long.

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