Hitachi EH-150 Applications Manual page 120

(4) Connection open error
EH-ETH2 can detect the connection open error in case of ASR connection specified as active node. When the
connection is not established in case of ASR connection specified as passive node or task code connection, check
the connection at the other node (active side).
Check the following points at EH-ETH2
- Communication protocol at both EH-ETH2 and the
other station.
- IP address and Port number at both stations.
- The configuration of the other station is "specified".
Is the above-mentioned
setting wrong?
Please check the following points at the other node
- Power supply
- The connection is specified as passive connection.
Is the above-mentioned
setting wrong?
Turn off and on the power of whole network and
all connected devices. If you still have the same
problem, contact your local Hitachi supplier.
Importance
[Retry action of Open request for active port]
When an other station to a response cannot be found to the open request that EH-ETH2 sends, EH-ETH2 sends the TCP
packet which contains the "SYN" flag at intervals followiong the patameter of "Open Retry Times / Intervals".
When EH-ETH2 detects a timeout, ERR LED turns on and EH-ETH2 waits an open request from the user program.
1
Connection does not establish
Y
N
Y
N
10-6
Chapter 10 Troubleshooting
Set the Ethernet information
correctly and reset the EH-ETH2.
Correct the parameters and turn
off and on at the other station.
After the EH-ETH2 is reset,
"Open request" will be sent.