Reference MVI56-DH485R
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ControlLogix Platform
User Manual
DH485 Interface Module for Remote Chassis
ProSoft Technology, Inc.
Page 71 of 97
August 27, 2009
Select one of the tabs in the dialog box to select the channel to configure with the
DH-485 protocol. The following figure displays an example configuration for
channel 1.
Select the correct baud rate used on the DH-485 network. Next select the node
address for the SLC on the network. Each node on the network must have a
unique node address. Next set the Token Hold Factor and Maximum Node
Address for the SLC. Select the Apply button to apply the settings configured. If
you require help setting up the channel, select the Help button on the form. After
configuring the channel, download the new configuration to the SLC processor.
Ladder Logic: Remote SLC
If the SLC will be used to monitor and control data in the DH-485 driver device,
ladder logic is required. No ladder logic is required if user commands are defined
in the DH-485 driver module to handle all data requirements. The examples
below describe the two data access methods: CIF and Data File.
CIF Data Access
CIF data access permits up to 244 bytes of data in the DH-485 driver module to
be monitored and controlled for each port. Due to the extreme limit on the data
size, this method should only be used if the data file access method is not offered
on the monitoring and controlling device. The driver supports both read and write
access to this data area.
