NORD Drivesystems BU0080 - Manual (Page 27)

6 Data transmission
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6 Data transmission
6.1 I/O Messages - operating modes
Via I/O messages the control data is transmitted from the Master to the frequency inverter, or status data is
transmitted from the frequency inverter to the Master.
Transmission can be cyclically (Polling 7 Cyclic) or event controlled (Change Of State/Bit-Strobe). With the SK
700E series, 4 or 8 Bytes of data are transmitted.
6.2 Assembly
(P551) sets whether the AC profile is active. Via (P507) the active AC Drive assembly instance is selected or
the data length is specified (See table).
The following assembly instances are available for I/O messages:
Assembly Profile Length P551 P507
20 AC-DRIVE 4 Byte Control word + setpoint speed 1 1
21 AC-DRIVE 4 Byte Control word + setpoint speed 1 2
70 AC-DRIVE 4 Byte Status word + actual speed 1 1
71 AC-DRIVE 4 Byte Status word + actual speed 1 2
100 NORDAC 4 Byte Control word + setpoint 1 0 1
101 NORDAC 8 Byte Control word + setpoint 1 + setpoint 2 + setpoint 3 0 2
110 NORDAC 4 Byte Status word + actual value 1 0 1
111 NORDAC 8 Byte Status word + actual value 1 + actual value 2 +
actual value 3 0 2
6.3 AC Profile
If the AC Profile is activated (P551=On), the assembly instances 10, 21, 70 and 71 are valid. The process data
has the following meaning:
Instance Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 Fault
Reset Run
Forward
1
2 Setpoint speed [min
-1
](Low Byte)
20
3 Setpoint speed [min
-1
](High Byte)
0 NetRef NetCtrl Fault
Reset Run
Forward
1
2 Setpoint speed [min
-1
](Low Byte)
21
3 Setpoint speed [min
-1
](High Byte)
0 Run 1 Fault
1
2 Actual speed [min
-1
](Low Byte)
70
3 Actual speed [min
-1
](High Byte)
0 At
Referenc
e Ref from
Net Ctrl from
Net Ready Run 2 Run 1 Warning
Fault
1 Drive State
2 Actual speed [min
-1
](Low Byte)
71
3 Actual speed [min
-1
](High Byte)