Frequency reference selection – Yaskawa DeviceNet Option Card CM05x User Manual

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Drive Operation on DeviceNet 7-8

Frequency Reference Selection

The Drive can be configured to receive frequency reference commands from the DeviceNet network, the external
Drive terminals, or the Digital Operator.

There are two settings that determine the method of Frequency Reference Control:

• Drive Parameter b1-01 setting
• Network Frequency Reference setting
• Default Network Reference

Drive Parameter b1-01 Setting

The Drive Parameter b1-01 setting can be accessed in various ways:

1. Parameter

b1-01

If this attribute equals ‘0’, frequency reference control is from the Digital Operator
If this attribute equals ‘1’, frequency reference control is from the external terminals
If this attribute equals ‘2’, frequency reference control is from serial communications
If this attribute equals ‘3’, frequency reference control is from an option PC board (DeviceNet)

2. Yaskawa Class 104, Instance 1, Attribute 1

Network Frequency Reference Setting

The Network Reference setting can be ‘Enabled’ or ‘Disabled’. The power-up setting is determined by the
setting of parameter b1-01. The setting can be changed any time after power-up via the DeviceNet network.

When Network Reference is set to ‘1’, Drive parameter b1-01 is set to ‘3’ (option PC board) followed by an
ACCEPT command, and run/stop control is from the DeviceNet network. If Network Reference is set to ‘0’, Drive
parameter b1-01 is set to the contents of the Default Reference setting, EDS Parameter 26, followed by an
ACCEPT command.

While the Drive is running, if an attempt is made to change from network reference, DeviceNet will give a “Dnet
Error: Privilege Violation” error and will not allow write access to memory. The same happens if an attempt is
made to change from non-network reference to network reference. The Drive must be stopped before control
may be changed to or from network reference.