Specifications
49
Functional description
DFB behaviour is compliant with the previous description (see page 27),
Type Number Comment
DI 4 Operating mode selector switch in “Remote” position.
Operating mode selector switch in “Local” position.
Circuit breaker open
ATS fault
DO 2 Motor line contactor
Auto mode pilot light
AI - Spare
AO - Spare
ATS 48
DFB(cont’d)
5-Implementation
PLC and motor control device implementation
Variable speed
drive ATV61
The ATV61 is connected on Ethernet Ethernet IO scanning service is used to periodically
exchange data between the PLC and variable speed drive.
Input and output words are exchanged according to the table below.
ATV61 allows an interchange of 10 words In and 10 words Out. In our DFB, to manage the ATV61 starter,
5 input words are read and 3 output are written. Additional words can be read and written by a simple
modication of the I/O scanning conguration.
(see chapter Conguration).
The table below details the interface between the starter and the DFB into PLC application.
ATV61 UNITY PLC
Register Item Description Located @
%MW
Variable (DDT) DFB
pin
Comment
Reserved %MWx Word reserved
by the system
3201 ETA State register %MWx+1 ATV61_IO_SCAN.Fb_stat FbStat
8604 RFRD Actual speed
value
%MWx+2 ATV61_IO_SCAN.Fb_RPM FbRPM
3204 LCR Motor curent %MWx+3 ATV61_IO_SCAN.Measure Meas Free of
conguration
3218 IPR Input power %MWx+4 ATV61_IO_SCAN.Measure Meas Free of
conguration
8501 CMD Command
register
%MWx+5 ATV61_IO_SCAN.Q_Ctrl QCtrl
8602 LFRD Target velocity %MWx+6 ATV61_IO_SCAN.Q_RPM QRPM