Omron CS1W-SLK11-21 - 06-2004 Manual page 153

Troubleshooting
136
Ethernet: 01 to 7E (1 to 126)
SYSMAC NET: 01 to 7E (1 to 126)
Relay Errors
A relay error is caused when a command fails to reach the Unit to which it has
been sent. A relay error can be caused either by data failing to be passed
between Communications Units connected over a network (see example 1),
or by data being passed from a Communications Unit to a Unit that is not a
Communications Unit (e.g., to a CPU Unit) (see example 2). A relay error may
also occur if the destination node or the next relay node does not exist.
Example 1:
Data fails to be passed between Communications Units due to a routing table
error.
(2)
Example 2:
Data fails to be passed from a Communications Unit to the CPU Unit due to
the Communications Unit being offline from servicing.
(2)
Example 3:
Destination node or relay node does not exist.
(2)
PS: Power Supply Unit
(1)
CPU: CPU Unit
Send
SLK: SYSMAC LINK Unit
ETN: Ethernet Unit
Reply
(1)
Send
Reply
(1)
PS: Power Supply Unit
CPU: CPU Unit
SLK: SYSMAC LINK Unit
Send
ENT Ethernet Unit
Reply
Section 8-1
PS: Power Supply Unit
CPU: CPU Unit
SLK SYSMAC LINK Unit