aufisherman
Member
Hello,
Today I am trying to figure out the best way to write from controllogix to a plc5 only on change.
The situation:
- Migrated a Winview Terminal to ViewSE.
- PLC5 is still in the field and staying there
- Have already mapped all the read registers through my DHRIO card to a set of registers in the L75 processor. The graphics are tagged the set of registers in the L75 that are constantly being updated based on MSG instructions reading the PLC5 registers
- Now I have to setup the writes. The issue is I cannot just constantly be writing to the registers because there is logic internal to the PLC5 that unlatches bits.
Anyone have an idea and can point me in that direction?
Ideas:
- Have a MSG instruction for each bit being passed (~100 different bits) and Enable the MSG based on state change of the register in the L75.
- Figure out some way of marrying the read for a bit and the write for a bit where write bits update off read unless changed by graphic.
- call tech support
Thanks,
Today I am trying to figure out the best way to write from controllogix to a plc5 only on change.
The situation:
- Migrated a Winview Terminal to ViewSE.
- PLC5 is still in the field and staying there
- Have already mapped all the read registers through my DHRIO card to a set of registers in the L75 processor. The graphics are tagged the set of registers in the L75 that are constantly being updated based on MSG instructions reading the PLC5 registers
- Now I have to setup the writes. The issue is I cannot just constantly be writing to the registers because there is logic internal to the PLC5 that unlatches bits.
Anyone have an idea and can point me in that direction?
Ideas:
- Have a MSG instruction for each bit being passed (~100 different bits) and Enable the MSG based on state change of the register in the L75.
- Figure out some way of marrying the read for a bit and the write for a bit where write bits update off read unless changed by graphic.
- call tech support
Thanks,