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Application description

Controlling the drive

Commissioning of the Control Unit CU230P-2 DP with PROFIBUS ID-No: 35934076

Version 1 Issue May 2009 31/33

PDF_Commissioning_of_CU230P_2_DP_with Profibus_en_V1.doc

10 Controlling the drive

Control word 1 (STW1) and the main set-point (HSW) are sent to the drive

via the PROFIBUS interface. Status word 1 (ZSW1) and the main actual

value (HIW) are received from the drive.

The drive is started by sending the typical control word 047E, followed by

047F (edge of bit 0: ON). In order to stop the drive, word 047E should be

sent to the drive (edge of bit 0: OFF). The control word is sent together with

process data word 1 (PZD1) that should be specified in the variable table

VAT_1 (bit memory word MW0, refer to Fig. 10-1).

Status word 1 (ZSW1) is received from the drive (PZD1) and is transferred

into the bit memory word MW4. The MW4 can be taken from variable table

VAT_1 (refer to Fig. 10-1).

The main setpoint is sent, together with PZD2 to the drive - and the main

actual value is received from the drive in PZD2. The main set-point should

be specified in the variable table VAT_1 (bit memory word MW2, refer to

Fig. 10-1). The response - the main actual value - is saved in the MW6 and

can be taken from the variable table (refer to Fig. 10-1).

The frequency setpoint and actual value are normalized so that 4000(hex)

corresponds to 50Hz. The highest value that should be sent is 7FFF. The

normalization frequency (reference frequency) can be modified in P2000

(default, 50Hz).

Figure 10-1 Controlling the drive

Enter control word 1

Enter main setpoint

Read-out status word 1

Read-out actual

frequency

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