ABB AC 800M

Section 6 Linking Device LD 800DN Run/Idle State
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Run/Idle State
The LD 800DN linking device has to be in Idle mode before modifying any
configuration data on it. Re-configuring the DeviceNet parameters on an
LD
800DN does not disrupt the flow of input data from the DeviceNet slave
devices to the CI873. However, no output data is applied from the linking device
to the DeviceNet slave devices while the linking device is in Idle mode.
The linking device LD 800DN has two modes of operation — Run and Idle.
In Ru
n mode, the LD 800DN sends output data to the slaves and receives input data.
During normal operation, it must be in Run Mode.
In Idle mode, the LD 800DN receives input data from the slaves but it does not send
output data to the DeviceNet slave devices. In Idle mode the LD 800DN’s
configuration can be changed.
The LD 800DN module powers up in Idle mode. CI873 sets it into Run mode after
configuration, before starting I/O communication. A re-configuration performed
from Control Builder, requires LD 800DN to be put in Idle mode. These state
changes are handled by CI873.