Profibus/PLC Addressing in S7-315

I have an application were a s7-315 PLC must communicate
with a Masterdrive ac inverter through (CBP) Profibus. I set up
DB150 for sending/receiving data to the drive. I specified
the first word in DB150 as the (PZD1) control word. Now
for example if I wanted to turn the drive on. Biconnector
3100 would have to be set. So I would set bit DB150.dbx0.0?
or DB150.dbx1.0? I have an old example here I am confused
because dbx1.0 is used. Is this a case were the bits are
"flipped" around like the alarms in Pro Tool Pro?

Yes, the bits are swapped. Here is the control word I formulate for a MasterDrive with the telegram starting at DBW0:

A #FaultReset
= DBX 1.7

A bStartDrive
= DBX 1.0 //Drive ON/OFF1 command
S DBX 1.1 //Drive OFF2 command
S DBX 1.2 //Drive OFF3 command
= DBX 1.3 //Drive ENABLE command

SET //Force the other control bits
S DBX 1.6 // Setpoint enable (bit 6)
S DBX 0.2 // Control from PLC (bit 10)
S DBX 0.3 // Forward speed release (bit 11)
S DBX 0.4 // Reverse speed release (bit 12)
S DBX 0.7 // No external fault (bit 15)

Swapping....

Thanks Simon for your help!

If you look under the "downloads" section on this site, a masterdrive function is available. Just download the file and retreive in to Step 7. This block may save you a couple hours of head stratching.