NC Commissioning with HMI Advanced
11.5 Axes and spindles
Manual
Commissioning Manual, 05/2008, 6FC5397–4CP10–4BA0
405
Assignment of the 2nd measuring system (index 1) of the machine axis to the measuring
circuit input of the ADI4 module is performed via the axis-specific machine data:
● MD30220 $MA_ENC_MODUL_NR[1] = 4
with 4 = (Index 3 of the corresponding MD13050 + 1)
For this, see Subsection
"Setpoint value/actual value channels" (Page 393).
Machine data
Table 11-22 Drive configuration: Machine data
Number Name Name/remarks
General ($MN_ ... )
13050 DRIVE_LOGIC_ADDRESS[n] Logical I/O address of drive
13060 DRIVE_TELEGRAM_TYPE[n] Drive message frame type for the drives connected to
PROFIBUS DP
30220 ENC_MODULE_NR[0] Actual value assignment: Logical drive number for position
measuring system 1
30220 ENC_MODULE_NR[1] Actual value assignment: Logical drive number for position
measuring system 2
Interface signals
Table 11-23 Switchover of position measuring system: Interface signals
DB number Bit, byte Name
Axis/spindle-specific Signals from PLC to axis/spindle
31, ... 1.5 Position measuring system 1
31, ... 1.6 Position measuring system 2
11.5.8 DSC (Dynamic Servo Control)
The DSC function eliminates the deadtime that necessarily exist at the speed setpoint
interface normally used between the NC and drive due to relocation of the position controller
into the drive.
That results in the following advantages for an axis operated with DSC:
● Considerably improved fault response/stability of the position control loop
● Improved control behavior (contour precision) if the higher servo gain (Kv factor) that can
be set in conjunction with DSC is used.
● A reduction of the cyclic communication load on the PROFIBUS, if the position control
cycle/PROFIBUS cycle is reduced by adjusting the above parameters, even if the control
loop performance is the same.
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