Setting Reference Values - Siemens SIMATIC S7-1500 Function Manual

3.10.3

Setting reference values

The reference values for the drive connection and encoder connection must be set
identically in the controller, and in the drive or encoder.
The setpoint speed setpoint NSET and the actual speed value NACT are transmitted in the
PROFIdrive frame as a percentage value relative to the reference speed. The reference
value for the speed must be set identically in the controller and in the drive.
The resolution of the actual value in the PROFIdrive frame must likewise be set identically in
the controller and in the drive or encoder.
Frame settings
The controller settings are made in the TIA Portal under "Technology object > Configuration
> Hardware interface > Data transmission".
The settings for drive and encoder are set in the configuration for the respective hardware.
The following table contrasts the controller settings and corresponding PROFIdrive
parameters (<TO> stands for the applicable technology object):
Setting in the TIA Portal
Frame
Reference speed in [rpm]
Maximum speed of the motor in [rpm]
Encoder message frame
Encoder system
(linear or rotary encoder)
Encoder type
0: incremental
1: absolute
2: cyclic absolute
Resolution (linear encoder)
The grid spacing is specified on the nameplate
of the sensor as a separation distance of the
marks on the linear measuring system.
Increments per revolution
(rotary encoder)
Number of bits for fine resolution XIST1 (cyclic
actual encoder value, linear or rotary encoder)
Number of bits for fine resolution XIST2 (abso-
lute encoder value, linear or rotary encoder)
Differentiable encoder revolutions
(rotary absolute value encoder)
S7-1500 Motion Control V13 Update 3
Function Manual, 07/2014, A5E03879256-AC
Controller
tag in the technology data block
<TO>.Actor.Interface.Telegram
<TO>.Actor.DriveParameter.ReferenceSpeed
<TO>.Actor.DriveParameter.MaxSpeed
<TO>.Sensor[n].Interface.Telegram
<TO>.Sensor[n].System
<TO>.Sensor[n].Type
<TO>.Sensor[n].Parameter.Resolution
<TO>.Sensor[n].Parameter.StepsPerRevolution
<TO>.Sensor[n].Parameter.FineResolutionXist1
<TO>.Sensor[n].Parameter.FineResolutionXist2
<TO>.Sensor[n].Parameter.DeterminableRevolutions
3.10 Drive and encoder connection
PROFIdrive
parameter
P922
(SINAMICS
drives: P2000)
(SINAMICS
drives: P1082)
P922
P979[1] Bit0
P979[5]
P979[2]
P979[2]
P979[3]
P979[4]
P979[5]
Basics
31