Rockwell Automation 57C422B 2 Axis Servo Module - Manual (Page 44)

4-16 2-Axis Servo Module M/N 57C422B
same user LEDs when the “update LEDs " command
(register 2114) is issued. Since this could lead to confusion,
you should only use one register (either 27 or 2075) in an
application, but not both. Refer to figure 4.20.
4.22 Register 28: Direct Drive Reference
Command
Register 28 can be used to provide a direct reference to the
drive. This value is read continuously by the module
whenever the "output volts" (register 65) command is issued.
The values may range from -1984 to 1984 corresponding to
an output range of +10 volts. Refer to figure 4.21.
4.23 Registers 29, 30: Sync Position
Registers 29, 30 contain the sync position. The sync position
register can be used to define a position where an action
needs to occur. This register is read by the module whenever
the "define sync position" (register 66) command is issued.
The sync position is used in conjunction with "position >=" or
"position <" bits in register 72. When the value in the sync
Figure 4.20 – User-Controlled LED Register
Figure 4.21 – Drive Command Reference Register