6Functions
Festo – GDCP-CMMP-M0-FW-E N – 1304N H 47
6.5 Setpoint specification
6.5.1 Analogu e setpoint
Through the analogue inputs, setpoint values can be specified as controller input data via a corre s-
pondingly scaled input signal.
The setting of the function is dependent on the number of inputs used, the selected control interfac e
and the selec ted operating mode/function.
Setpoint value
AIN0 AIN1 AIN2
Torque/force x x x
Speed x x x
Position x – –
Tab. 6.12 Setpoint value via analogue inputs
Scaling
Specify in the FCT which value of the respective input variables corresponds to an input voltage of 10 V.
The scaled range corresponds to a linear characteristic cur ve symmetric to the zero point
(e.g. –1000 R/min … + 1000 R/min).
Zero balancing
With an externally specified voltage 0 volt, an undesired setpoint value can still be generated due to
voltage differences. For zero balancing, you can manually enter an offset in the FCT or execute syn-
chronisation automatically (recommendation).
Through zero balancing, the scaled range is divided asymmetrically ( example Fig. 6.8:
–750 … +1250 R/min).
Safe Z ero
Threshold value of the input voltage, up to which the setpoint value = 0 is set to achieve a defined rest
of the drive, for example in the speed c ontrol mode, independently of offset fluctuations, noise, etc.
• Enter the threshold value U0 > 0 V an. If the input voltage UIN is in the range +U0 … –U0, the set-
point v alue = 0 is output. The offset set for zero balancing is taken into consideration.
Note that specifying the threshold value means that an appropriate setpoint range is no
longer av ailable for the application.
Filter time constant
AIN0 is a 16-bit input. Due to the high resolution, a digital filter is activated.
• Specify the time constant to be used to filter the input voltage.
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