NORD Drivesystems BU0220 - Manual (Page 65)

7 PROFIBUS DP data transfer
BU 0220 GB-0912 Subject to technical amendments 65
7.2.1.7 BIT8 and BIT9 control word
Up to 2 inverter functions can be set directly via the bus master or the PLC by means of the control word. For
this, the required digital function (see list in parameter P420) must be assigned to Bit 8 of the control word via
parameter (P480 [-11]). The same procedure should be applied to Bit 9 of the control word and the function
assigned in parameter (P480 [-12]).
Example:
The values of analog inputs 1 and 2 are to be switched off as necessary via the PROFIBUS master on the
frequency inverter.
Solution:
Set parameter (P480 [-11]) to function "19" "Analog input 1 ON/OFF"
Set parameter (P480 [-12]) to function "20" "Analog input 2 ON/OFF"
In order to process the value from analog input 1 in the frequency inverter, Bit 8 must be set in the control
word. Otherwise the value will not be taken into account by the frequency inverter.
In order to process the value from analog input 2 in the frequency inverter, Bit 9 must be set in the control
word. Otherwise the value will not be taken into account by the frequency inverter.
Alternatively, the digital inputs 1 and 2 of the SK xU4-... module can also be processed directly by the
frequency inverter. For this, the FI which is allowed access to the inputs must be selected in parameter
(P154[-01]). Assignment of the functions is carried out via parameter (P480[-11]) or (P480[-12]) as described
above.
7.2.1.8 BIT10 and BIT13 status word
In the same way as Bit 8 and 9 of the control word, 2 functions can be described in the status word, which set
Bits 10 or 13 on the occurrence of the relevant inverter status. The list of possible functions corresponds to the
"Relay function" or the "Digital output function" (see parameter (P434)).
Example:
The inverter warning "Overcurrent warning" is to be communicated directly in the status word of the frequency
inverter.
Solution:
Set parameter (P481 [-09]) to function "9" "Overcurrent warning"
If the conditions for the triggering of the "Overcurrent warning" are fulfilled in the frequency inverter, the
inverter sets Bit 10 of the status word to the value "1".
Alternatively, the digital outputs 1 and 2 of the SK xU4-... module can also be processed directly by the
frequency inverter. For this, the FI which is allowed access to the inputs must be selected in parameter
(P154[-02]). Assignment of the functions is carried out via parameter (P481[-09]) or (P481[-10]) as described
above.