scottmurphy
Member
- Join Date
- Oct 2004
- Posts
- 363
I had a problem today with a CLX and ethernet IO rack.
The CPU is a 1756-L55 ControlLogix5555 Controller Rev 10.24.
I should point out, that this has been a working application
for quite some time now, there may have been intermittent problems of a similar nature, but only became apparent today.
Comms had been lost to the remote rack, upon attempting to
'ping' the remote rack, there was inconsistent results,
request timed out etc.
The Main rack was connected to a netgear switch, which then had
a moxa EDS-305 media convertor connected to connect to the
remote rack. This media convertor had 4 ports on it.
The Moxa unit is an un-managed switch.
The only way I could get the system up and running again, was
to plug the Moxa unit directly into the main rack, then the
scada server into one of the spare ports on the Moxa unit,
ie. take the netgear switch completely out of the equation.
I tried different port combinations etc, even tried the little
cheapy that I carry in the car with me, still didn't work.
I have brought both switches with me now, and seem to have
no major issues using them to connect on this network. As it
stands at the moment, there is only the moxa switch in the
circuit, and the system is working honky dory, except that
none of the original hardware is in place.
The obvious answer, is that the netgear switch is the issue, but
if it works fine where I am now, what is the difference? I am
going to try and get a managed switch for them anyway, but am
reluctant to unplug the moxa from the direct connection to the
main rack, for fear that it may not work again.
Is there anything else I should be looking out for? I guess the
first thing would be to update the revision?
The CPU is a 1756-L55 ControlLogix5555 Controller Rev 10.24.
I should point out, that this has been a working application
for quite some time now, there may have been intermittent problems of a similar nature, but only became apparent today.
Comms had been lost to the remote rack, upon attempting to
'ping' the remote rack, there was inconsistent results,
request timed out etc.
The Main rack was connected to a netgear switch, which then had
a moxa EDS-305 media convertor connected to connect to the
remote rack. This media convertor had 4 ports on it.
The Moxa unit is an un-managed switch.
The only way I could get the system up and running again, was
to plug the Moxa unit directly into the main rack, then the
scada server into one of the spare ports on the Moxa unit,
ie. take the netgear switch completely out of the equation.
I tried different port combinations etc, even tried the little
cheapy that I carry in the car with me, still didn't work.
I have brought both switches with me now, and seem to have
no major issues using them to connect on this network. As it
stands at the moment, there is only the moxa switch in the
circuit, and the system is working honky dory, except that
none of the original hardware is in place.
The obvious answer, is that the netgear switch is the issue, but
if it works fine where I am now, what is the difference? I am
going to try and get a managed switch for them anyway, but am
reluctant to unplug the moxa from the direct connection to the
main rack, for fear that it may not work again.
Is there anything else I should be looking out for? I guess the
first thing would be to update the revision?