Section 6 Linking Device LD 800DN LD 800DN I/O Tables
9ARD000014-600 A 183
LD 800DN I/O Tables
The LD 800DN maintains an I/O table accessible by both DeviceNet slaves and
CI873. The DeviceNet interface in the LD 800DN accesses the I/O tables, as slave
I/O connections are processed by the DeviceNet master. There is no buffering or
timed updates of the I/O within the module. Safeguards are in place to ensure data
integrity by prohibiting simultaneous access by the Ethernet and DeviceNet
interfaces. There is no synchronization between the two network interfaces.
When an output data is required on a I/O connection of a slave, the output data is
read from the Output table. This output data is written by the Ethernet interface.
When an input data is received on a I/O connection of a slave, it is copied to the
Input table. This data is available for reading by the Ethernet interface and sent to
the EtherNet/IP I/O scanner during the next data exchange.
Status and Diagnostics Indicators
LD 800DN has a group of LED indicators on its front side for displaying the current
status of the module and the network interfaces. The layout of the LEDs is shown in
Figure 70.
Figure 70. LD 800DN LEDs
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