Control through the embedded fieldbus interface 327 References for the ABB Drives profilesThe ABB Drives profiles support the use of two fieldbus references, REF1 and REF2.The references are 16-bit words each containing a sign bit and a 15-bit integer. Anegative reference is formed by calculating the two’s complement from thecorresponding positive reference.The fieldbus references are scaled before they are written into signals 02.38 EFBmain ref1 or 02.39 EFB main ref2 for the use in the drive. Parameters 50.04 Fb ref1modesel and 50.05 Fb ref2 modesel define the scaling and possible use of thefieldbus reference REF1 and REF2 as follows:• If you select value Speed, the fieldbus reference can be used as a speedreference and it is scaled as follows:• If you select value Torque, the fieldbus reference can be used as a torquereference and it is scaled as follows:• If you select value Raw data, the fieldbus reference REF1 or REF2 is the drivereference without scaling.1) Unit depends on the use of the reference in the drive. Rpm for speed reference and % for torque.Fieldbus reference REF1 or REF2[integer]Corresponding speed referencein the drive [rpm]20 000 value of parameter 19.01 Speed scaling0 0-20 000 -(value of parameter 19.01 Speed scaling)Fieldbus reference REF1 or REF2[integer]Corresponding torque referencein the drive [%]10 000 100% of motor nominal torque0 0-10 000 -(100% of motor nominal torque)Fieldbus reference REF1 or REF2[integer]Corresponding referencein the drive [rpm or %] 1)32 767 32 7670 0-32 768 -32 768
