JohnCalderwood
Member
Hi Guys,you know it is serious if I am asking questions....
We have a ControlLogix PLC that was migrated from a 1771-PLC5 using Rockwell's hardware conversion kit and their software conversion. This was done by a 3rd party supplier, who are no longer on site.
The remote racks are on Remote I/O and are Flex I/O (1794-ASB) with a mixture of analog and digital modules. They are connected using a DHRIO module in the ControlLogix main chassis.
The analog cards are now communicated with using MSG instructions, whereas as before they were BTR/BTW instructions, and on the Hardware I/O configuration we could see the individual channels on the analog cards, including data and signal type (4-20mA).
The existing analog signals that were there in the old PLC are working perfectly, but I have a feeling that not all the channels were configured, as when we now try to add a signal to an analog input card (1794-IE8) it cannot be read.
On the PLC hardware tree, we can only drill down to the racks and adapter modules, but even when we try and "discover modules" there are none seen.
What we would do in the past (on the PLC5) was access the channel info and change the 4-20mA to 0-10V, and back, then accept edits, which would download configuration to the module.
Now I have no access to the modules like that.....
It only appears to be on the Flex I/O via DHRIO cards, as we can see properties on the Point I/O modules and other Flex I/O racks, but they are through ethernet adapters.
Any helpful suggestions are appreciated.
John
We have a ControlLogix PLC that was migrated from a 1771-PLC5 using Rockwell's hardware conversion kit and their software conversion. This was done by a 3rd party supplier, who are no longer on site.
The remote racks are on Remote I/O and are Flex I/O (1794-ASB) with a mixture of analog and digital modules. They are connected using a DHRIO module in the ControlLogix main chassis.
The analog cards are now communicated with using MSG instructions, whereas as before they were BTR/BTW instructions, and on the Hardware I/O configuration we could see the individual channels on the analog cards, including data and signal type (4-20mA).
The existing analog signals that were there in the old PLC are working perfectly, but I have a feeling that not all the channels were configured, as when we now try to add a signal to an analog input card (1794-IE8) it cannot be read.
On the PLC hardware tree, we can only drill down to the racks and adapter modules, but even when we try and "discover modules" there are none seen.
What we would do in the past (on the PLC5) was access the channel info and change the 4-20mA to 0-10V, and back, then accept edits, which would download configuration to the module.
Now I have no access to the modules like that.....
It only appears to be on the Flex I/O via DHRIO cards, as we can see properties on the Point I/O modules and other Flex I/O racks, but they are through ethernet adapters.
Any helpful suggestions are appreciated.
John