Reference MVI56-DH485R
♦
ControlLogix Platform
User Manual
DH485 Interface Module for Remote Chassis
ProSoft Technology, Inc.
Page 63 of 97
August 27, 2009
Offset Description
Length
2 to 40
Spare
39
41
3001 or 3101
1
Block 3002 and 3102 requests change the commands listed in the block to the
conditional type (type = 2). Block 3002 is used for Port 0 and 3102 is used for
Port 1 commands. This type code should only be utilized for write commands.
The format for the request block from the ladder logic is as follows:
Offset Description
Length
0
3002 or 3102
1
1
Number of command indexes
1
2 to 41
Command index list
40
The response block from the module to the processor has the following format:
Offset Description
Length
0
Write Block ID
1
1
Number of commands processed
1
2 to 40
Spare
39
41
3002 or 3102
1
Warm Boot Block
This block is sent from the ControlLogix processor to the module (output image)
when the module is required to perform a warm boot (software reset operation).
This block is commonly sent to the module any time the configuration file is
modified. This will force the module to read the new configuration information and
to restart. The following table describes the format of the control block.
Offset Description
Length
0
9998
1
1 to 41
Spare
41
Cold Boot Block
Block 9999 performs a cold-boot operation on the module. The following table
describes the format of the block constructed by the processor.
Offset Description
Length
0
9999
1
1 to 41
Spare
41
5.2.3 ControlLogix Processor Not in Run
Whenever the module detects that the processor has gone out of the Run mode
(that is, Fault or PGM), the DH-485 ports can be shut down as prescribed in the
user configuration. When the processor is returned to a running state, the module
will resume communications on the network.
