Omron SYSMAC CV Series Operation Manual page 111

CV-mode Response Codes
Relaying Errors
Example 1
SLK
CPU PS
Host
computer
Example 2
SLK
CPU PS
Host
computer
Example 3
(2)
SNT CPU PS
Host
computer
A relaying error occurs when a command from the Host Link Unit is not able to
reach the destination node. There are basically three types of relaying errors:
when data is not passed from one Link Unit to another, when data is not passed
from a Link Unit to another Unit (e.g., a CPU), and when the destination node or
relaying node does not exist. The following graphics show the examples of these
relaying errors.
In the following examples, (1) indicates that transmission data was not relayed,
and (2) indicates that the relaying error data and response code are returned to
the Unit that issued them. MC stands for main code and SC stands for sub-code.
After ascertaining the node where the error occurred, determine the kind of error
from the response code and take necessary steps for correction.
In this example, data transmission between two Link Units was not possible,
e.g., due to a routing table error.
1 MC – – SC
(2)
SLK
Transmission
Response
In this example, data transmission from a Link Unit to the CPU was not possible,
e.g., due to no Link Unit servicing
1 MC – – SC
(2)
In this example, no destination node or relaying node exists.
1 MC – – SC
SNT SLK
Transmission
Response
SNT CPU PS
PS :Power Supply Unit
(1)
CPU :Central Processing Unit
SLK :SYSMAC LINK Unit
SNT :SYSMAC NET Link Unit
SLK
CPU PS
PS
(1)
CPU :Central Processing Unit
SLK :SYSMAC LINK Unit
Transmission
Response
(1)
CPU PS
PS
CPU :Central Processing Unit
SLK :SYSMAC LINK Unit
SNT :SYSMAC NET Link Unit
Section 6-4
SNT CPU PS
:Power Supply Unit
SLK SNT CPU PS
:Power Supply Unit
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