MarkNightingale
Lifetime Supporting Member + Moderator
Hi Guys,
I have a slight problem, and a curious problem which you might be able to assist me with.
We have a ControlLogix 1756-L62, this is connected on the backplane to ethernet card 1756-ENBT/A. This in turn connects to the field I/O, which is Flex I/O modules 1794-AENT.
The module I have a problem with has 2 input cards 1794-IB16/A and 1 output card 1794-OB16/A.
Every so often the module fails, or should I say the network fails, but only on this node.
I think it is a network issue because of the LED's on the front of the Flex Adapter. When the network fails, the module status LED remains green, but the network status LED flashes red, and the link LED flashes green.
I have read the manual and all it says is that there is a Connection Timeout. What connection is this implying.
I have removed the input modules and the output modules and this gives a different fault, so I know those connections are good.
When I look in the I/O tree on Logix 5000, I get the little yellow exclamation marks on all modules in that 'node', but when I pull up the properties the status stays as running.
After 2 or 3 seconds the modules all come back online and everything works fine again for 20 minutes or so.
Now the problem I have is when the modules fault, all the outputs drop off, which I assume is for safety reasons.
Now the curious problem. Although all of the outputs drop off there are a couple of double solenoid controlled pistons. If these pistons are extended when the modules fail, they retract as if the output comes on to retract them.
And vice versa if the pistons are retracted, they extend, as if the output comes on to extend the piston.
I have watched the output LED's when the modules fail, and they all go off.
So I guess my first question is why the modules might be failing.
And my second question is why would the pistons act this way when the modules do fail.
Sorry for being so long winded, but i just wanted to give as much detail as possible.
Mark
I have a slight problem, and a curious problem which you might be able to assist me with.
We have a ControlLogix 1756-L62, this is connected on the backplane to ethernet card 1756-ENBT/A. This in turn connects to the field I/O, which is Flex I/O modules 1794-AENT.
The module I have a problem with has 2 input cards 1794-IB16/A and 1 output card 1794-OB16/A.
Every so often the module fails, or should I say the network fails, but only on this node.
I think it is a network issue because of the LED's on the front of the Flex Adapter. When the network fails, the module status LED remains green, but the network status LED flashes red, and the link LED flashes green.
I have read the manual and all it says is that there is a Connection Timeout. What connection is this implying.
I have removed the input modules and the output modules and this gives a different fault, so I know those connections are good.
When I look in the I/O tree on Logix 5000, I get the little yellow exclamation marks on all modules in that 'node', but when I pull up the properties the status stays as running.
After 2 or 3 seconds the modules all come back online and everything works fine again for 20 minutes or so.
Now the problem I have is when the modules fault, all the outputs drop off, which I assume is for safety reasons.
Now the curious problem. Although all of the outputs drop off there are a couple of double solenoid controlled pistons. If these pistons are extended when the modules fail, they retract as if the output comes on to retract them.
And vice versa if the pistons are retracted, they extend, as if the output comes on to extend the piston.
I have watched the output LED's when the modules fail, and they all go off.
So I guess my first question is why the modules might be failing.
And my second question is why would the pistons act this way when the modules do fail.
Sorry for being so long winded, but i just wanted to give as much detail as possible.
Mark