Siemens SINAMICS G120X - Process Value Scaling and Units

3 Program configuration
Integration of a SINAMICS G120X frequency converter in PCS 7
Entry ID: 109793986, V1.0, 09/2021
21
© Siemens AG
2021 All rights reserved
2. At the block parameter "telegram", configure telegram 20 by changing the
value to "20".
Note
Additional information on the FB "Drive" can be found in the PCS 7 Advanced
Process Library manual.
https://support.industry.siemens.com/cs/ww/en/view/109760968
3.2.3 Process value scaling and units
The speed setpoint "STW2" and the actual speed "ZSW2" are transmitted as
integers in the range 0 to 16384. The normalization of the raw value into a process
value is done in PCS 7 at the driver block "FbDrive".
In the CFC plan in PCS 7 there are a few places that you can perform the
normalization of the process value. They are as follows:
Table 3-3
Block
I/O
Description
FbDrive
PZDIn2Unit
Unit of the actual value
PZDIn2Scale.High
Upper limit, actual value
PZDIn2Scale.Low
Lower limit, actual value
SPLiScale.High
Maximum setpoint
SPLiScale.Low
Minimum setpoint
MotSpdCl
SP_HiLim
Upper setpoint limit
SP_LoLim
Lower setpoint limit
SP_OpScale.High
Upper limit for bar graph
SP_OpScale.Low
Lower limit for bar graph
SP_Unit
Unit for labeling on the faceplate
The values PzdIn2m, PZDIn2Scale and PZDIn2Unit are transmitted via the I/Os
"SpeedLink", "SpeedScale" and "SpeedUnit" to the MotSpdCL block.
• Adapt the scaling to suit your application. For G120X applications with pumps
and fans, values in percent or revolutions per minute are recommended.
Table 3-4
Code
Unit
Description
1077
Hz
Hertz
1082
1/s
Revolutions per second
1083
1/min
Revolutions per minute
1342
%
Percent
Note
Units of measurement in PCS 7 are coded according to the IEC 611582
standard. You can find a full list of all units of measure in the APL manual:
https://support.industry.siemens.com/cs/ww/en/view/109760968/98818690699