Converting S5-103U program to Omron CJ1M

[Jay Anthony 118]

I have a Siemens S5103U program in STL which I have been able to convert pretty well until I hit this piece of code. Can anybody tell me about DO statement below? I've read the book and the examples but I can't figure out what it does. Code (Snip) C DB 12 L KF +0 T FW 180 L KF +0 DO FW 180 T DW 0 L FW 180 L KF +1 +F T FW 180

[Groo 7]

Its S5 indirect addressing, its loading zero into a DW which is offset by the contents of FW180, L 0 T DW(0+FW180) so if FW180 = 50 it woyld be putting zero into DW50.

[Jay Anthony 118]

Thanks! So this is more like indexed addressing with base word and offset determined by FW180.