Hey guys,
We recently picked up a new customer that just finished a controls upgrade with some other systems integrator company.
They upgraded to an L81 controller but still have some old 1794- Flex IO racks scattered throughout the plant. These Flex IO racks are still communicating with the PLC through DH+ using a 1756-DHRIO card in the PLC Chassis.
All the IO is responding great other than the analog inputs. We can start and stop motors using the Flex IO we can also receive Discrete Inputs.
for some reason the analog ins arent receiving any data. Our messaging block isnt erroring out. but our DHRIO card say "recoverable" but now information on why.
They said that the analog inputs (1 1794-IE8 on each Flex IO rack, slot 0) stopped working when the came back up from a power outage and that the PLC code shouldnt have been touched throughout the down period.
Ive double and triple checked the MSG block configuration, Swapped the card, swapped the Back Plane terminal block thing where the card plugs into, and still nothing. ive verified a i have a 4-20ma signal into the card as well.
any ideas would be much appreciated. were going to hopefully move them to ethernet instead of DH+ but parts are a ways out.
Thanks guys!
We recently picked up a new customer that just finished a controls upgrade with some other systems integrator company.
They upgraded to an L81 controller but still have some old 1794- Flex IO racks scattered throughout the plant. These Flex IO racks are still communicating with the PLC through DH+ using a 1756-DHRIO card in the PLC Chassis.
All the IO is responding great other than the analog inputs. We can start and stop motors using the Flex IO we can also receive Discrete Inputs.
for some reason the analog ins arent receiving any data. Our messaging block isnt erroring out. but our DHRIO card say "recoverable" but now information on why.
They said that the analog inputs (1 1794-IE8 on each Flex IO rack, slot 0) stopped working when the came back up from a power outage and that the PLC code shouldnt have been touched throughout the down period.
Ive double and triple checked the MSG block configuration, Swapped the card, swapped the Back Plane terminal block thing where the card plugs into, and still nothing. ive verified a i have a 4-20ma signal into the card as well.
any ideas would be much appreciated. were going to hopefully move them to ethernet instead of DH+ but parts are a ways out.
Thanks guys!