Omron CQM1H-CLK21 - Manual (Page 232)

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Commands and Responses for Controller Link Units Section 6-5
4. Any node which is not active in the network retains the status that existed
immediately prior to the generation of the communications error.
5. Only the PLC operation status and PLC error status will be refreshed for
nodes that are not participating in a data link that is active in the network.
6-5-8 ECHOBACK TEST
Executes an echoback communications test between specified nodes.
Command Block
Response Block
Parameters Test data (command, response): For the command, up to 1,998 bytes of
data can be specified to be sent to a specified node. For the response, the
test data that was sent by the command is returned unchanged.
An error is generated if the data returned by the response is different from the
data that was sent by the command.
6-5-9 BROADCAST TEST RESULTS READ
Reads for each node the results (number of receptions) of a BROADCAST
TEST DATA SEND command that has been sent to all nodes in a specified
network. (For details on the BROADCAST TEST RESULTS SEND command,
refer to 6-5-10 BROADCAST TEST DATA SEND.
Command Block
Response Block
Parameters Number of receptions (response): The number of times that broadcast test
data has been received at the command destination node from the time that
the last BROADCAST TEST RESULTS READ command was sent until this
one was sent is returned.
An error will be generated if that number of receptions differs from the number
of times that the BROADCAST TEST DATA SEND command was issued dur-
ing that same period.
The number of receptions value being retained at the destination node is
cleared when the BROADCAST TEST RESULTS READ command is exe-
cuted.
Command
code
Test data
1,998 bytes
max.
08 01
Command
code
Test data
1,998 bytes
max.
08 01
Response
code
Command
code
02 08
Response
code
Number of
receptions
Command
code
08 02