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When the inverter has enabled DeviceNet control via P_43 or a [DNT] terminal input
signal, the DeviceNet host may control the inverter. However, the host computer must
also set bit(s) in the polled I/O that is input data (consumed I/O) to the inverter. The bit
names and definitions are:
• Network Control – When the Network Control bit = 1, the host computer indicates
that it wants to control the inverter. If the inverter setting P_43 or [DNT] has enabled
control, then the host computer can give FW Run and RV Run commands.
• Network Reference – Independent of network control, the host computer can supply
the following parameter values for real-time motor control:
• Output frequency – An alternate source for F_01 Output Frequency Setting
• Acceleration time – An alternate source for F_02 Acceleration Time Setting
• Deceleration time – An alternate source for F_03 Deceleration Time Setting
When the Network Reference bit = 1, the host computer indicates that it wants to
supply the output frequency and accel/decel setting to the inverter. If the inverter
setting P_43 or [DNT] has enabled network control, the inverter will use the alternate
values via DeviceNet. This applies independently of the Network Control bit setting.
The table below describes the Network Control and Network Reference setting logic.
The logic requires that the inverter has enabled DeviceNet control as described above.
Network Control and Network Reference Bit Logic *1
Network
No.
Control bit
1
0
2
1
3
1
4
0
Note 1:
Logic above requires inverter's P_43 or [DNT] to enable DeviceNet control.
Typically a network host computer needs to have control of Run/Stop, speed, accel, and
decel. This corresponds to No. 3 above, where both Network Control and Network
Reference bits are set = 1. If the inverter needs temporary local control, you can either:
• Turn OFF the Network Control bit and/or Network Reference bit at the network host.
Note that if you turn OFF only one of the two bits, the Run/Stop control comes from
one device and the speed / accel / decel values comes from the other device. Or,
• Use the inverter's DeviceNet enable settings P_43 or the input terminal [DNT]
(whichever is in effect) to temporarily disable DeviceNet control. This will cause the
inverter to have local control of Run/Stop and the speed / accel / decel settings.
The DeviceNet network may remain online (scanning) without errors while changing the
control between local or network, or changing the speed / accel / decel source.
Network
Source for Run/Stop
Reference Bit
0
Inverter
0
Network host
1
Network host
1
Inverter
L100DN Inverter
Source for Output
Freq. / Accel / Decel
F_01, F_02, F_03
F_01, F_02, F_03
Polled I/O from host
Polled I/O from host
55
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