Omron CS1W-DRM21, CJ1W-DRM21 operation manual Communications Error Operation Settings

TroubleshootingSection 9-3

9-3-4	Communications Error Operation Settings
	Use the following table to correct problems with the DIP switch setting for con-
	tinuing/stopping communications for errors.
	Error	Probable cause
Communications are stopped even though		When pin 3 on the DIP switch is ON, communications will be stopped if a
there is no communications error.		communications error, transmission timeout, or network power supply error
		occurs.
		While communications are stopped, the 7-segment displays will alternately
		display error code A0 and the error code of the communications error that
		caused the stoppage.
		After a network power supply error or transmission timeout is corrected, the
		indicators will show just the communications stoppage code (A0).
Communications are stopped by the DIP		• When communications can’t be restarted with slaves that were communi-
switch setting, but don’t resume after tog-		cating normally before the stoppage, stop the communications again.
gling the Clear Communications Error Stop-		Check that the slave has started up and perform the “clear communica-
page Bit.		tions error stoppage” operation.
		• It may be necessary to perform the operation twice if the network contains
		another company’s slave that take a long time to join the network.
9-3-5	Scan List Problems

Use the following table to troubleshoot scan list problems.

Error	Probable cause
A scan list couldn’t be created by the “cre-	Neither the create scan list nor clear scan list operations can be performed
ate scan list” operation.	until the I/O Data Communications flag goes ON. (The I/O Data Communi-
A scan list couldn’t be cleared by the “clear	cations flag will be OFF for a short time after the power is first turned ON
	and after the scan list clear operation is executed.)
scan list” operation.
	Make sure that the I/O Data Communications flag is ON before attempting
	to execute the create scan list or clear scan list operations.
The “create scan list” or “clear scan list”	Restart the DeviceNet Unit, execute the clear scan list operation, and then
operation was executed, but the master’s 7-	the create scan list operation if necessary.
segment displays still display “- -”.	Replace the DeviceNet Unit if this doesn’t correct the problem.
(The “- -” display usually lasts for 1 s after
the “create scan list” operation or 0.1 s after
the “clear scan list” operation.)

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