Powerflex 700 speed controll from modbus

[Ben Till 0]

Hi guys, I have a modbus rs-232 loop running round 10 inverters - 3 omron f7, 1 omron rx and 6 allen bradley powerflex 700's. this is using an omron scu card and the protocol macro setting from that card. At the moment i can read and write to all of the inverters perfectly well however, because of the different types of inverter being used and also the lack of memory left on the plc, i have condensed the program down as much as possible. My problem now is i want to be able to controll the speed of a powerflex 700, i could have done this by writing to a multiple register (function 16) however this is not possible for me to do as the function codes from the different inverters do not match up on my protocol and i dont have the space in the plc to add in another function block. So - what i thought i would be able to do (which doesnt seem to work) is to force a single coil to change the reference select and set up my two speeds in those two refeneces. 20comm-um009_-en-p.pdf If you view the manual it shows that having a combination of 0x0013, 0x0014 and 0x0015 forced on/off gives you the different references selected. Page 4-6. From this i have tried forcing coil 12 off, 13 off and 14 on - to coil 12 off, 13 on and 14 off. this however does not give me my change in speeds. If this is not possible i may have another solution to this however this would be my preffered method and so any help on the matter would be greatly appreciated. Thanks.