Hitachi HIDIC EH-150 Applications Manual page 107

(4) Connection open error
EH-ETH 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-ETH
- Communication protocol at both EH-ETH and the
other station.
- IP address and Port number at both stations.
- The configuration of the other station is "specified".
Is the above mentioned
Please check the following points at the other node
- Power supply
- The connection is specified as passive connection.
Is the above mentioned
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-ETH sends, EH-ETH sends the TCP
packet which contains the "SYN" flag at intervals of the following time.
ARP packet sends->6s->12s->24s->48s->64s->64s->64s->64s->64s->64s->64s->64s
In other words, EH-ETH stops the retry action of open request after about 10 minutes, after sending an ARP packet.
(1). When "less than 10 minutes" is set as an ASR connection timeout value.
- When EH-ETH detects a timeout, ERR LED is turned on red.
- After a timeout is detected, the retry action of Open request is done continuously.
(2). When "10 minutes or more" is set as an ASR connection timeout value.
- When all the retry action of Open request is completed, ERR Light Emitting Diode lights up red.
1
Connection does not establish
setting wrong?
N
setting wrong?
N
10-7
Chapter 10 Troubleshooting
Set the Ethernet information
Y
correctly and reset the EH-ETH.
Correct the parameters and turn off
and on at the other station. After
Y
the EH-ETH is reset, "Open
request" will be sent.