lostcontrol
Lifetime Supporting Member
This installation has been having issues with IO faults occuring, and clearing straight away. The devices are simple valves, 1x OP & En/DeEn feedback, with standard fault logic.
The installation consists of 2x 1756 racks, connected via ENET's. THe issues are occuring at the remote rack.
When on site, I noticed on a couple of occasions, 1 of the output modules would fault (outputs switch off, LED flashes red), and then come right again.
I am not sure if this is the exact cause of these issues, but I want to target this to begin with, as it does seem likley that this could be an issue, especially if the CPU is commanding a valve to operate, and it switches it self off, then the valve is not at its commanded state for the fault time, so it faults.
The other confusing thing, is that the SCADA is logging the fault as occuring, & clearing with exactly the same timestamp, this could be possible, as the IOServer is confgured for 1-sec, and the alarm log only displays to the second.
What I would like to know, is what can cause a 1756 IO module to fault randomly like this. All of the modules on this remote rack have their RPI's set to 35mS.
I have put some code in to monitor the module fault status, so hopefully, if it occurs again I will be able to see what the codes & info are.
We have had issues with the ETN comms in the past, but that has been reasonably solid for quite some toime. There are plans to change this to ControlNet in the near future....
The installation consists of 2x 1756 racks, connected via ENET's. THe issues are occuring at the remote rack.
When on site, I noticed on a couple of occasions, 1 of the output modules would fault (outputs switch off, LED flashes red), and then come right again.
I am not sure if this is the exact cause of these issues, but I want to target this to begin with, as it does seem likley that this could be an issue, especially if the CPU is commanding a valve to operate, and it switches it self off, then the valve is not at its commanded state for the fault time, so it faults.
The other confusing thing, is that the SCADA is logging the fault as occuring, & clearing with exactly the same timestamp, this could be possible, as the IOServer is confgured for 1-sec, and the alarm log only displays to the second.
What I would like to know, is what can cause a 1756 IO module to fault randomly like this. All of the modules on this remote rack have their RPI's set to 35mS.
I have put some code in to monitor the module fault status, so hopefully, if it occurs again I will be able to see what the codes & info are.
We have had issues with the ETN comms in the past, but that has been reasonably solid for quite some toime. There are plans to change this to ControlNet in the near future....