ProSoft Technology MVI56-103M - Manual (Page 106)

Reference MVI56-103M ♦ ControlLogix Platform
User Manual IEC 60870-5-103 Master Communication Module
Page 106 of 152 ProSoft Technology, Inc.
February 22, 2013
5.4.2 Command Control Block (9902)
The Block 9902 identification code is used by the processor to send a list of
commands to be placed in the command queue from the user-configured
command list. Commands placed in the queue with this method need not have
their enable bit set in the command list.
Word Offset in
Block Data Field(s) Description
0 Block ID This field contains the value of 9902 identifying the enable
command to the module.
1 Command count This field contains the number of commands to enable in the
command list. Valid values for this field are 1 to 60.
2 to 61 Command
Numbers to enable These 60 words of data contain the command numbers in the
command list to enable. The commands in the list will be
placed in the command queue for immediate processing by
the module. The first command in the list has an index of 0.
62 to 247 Spare Not Used
There is no response to this block by the module. The module will place the
selected commands into the command queue. If the command references a unit
that is not defined, the command will not be placed in the command queue.
Normal processing of the command list will continue after the commands
specified in this block are processed.
For digital output control, the use of Block 9901 and 9902 is preferred to the use
of the command list. The exact state of the output can be specified in the
command list and then the command can be enabled through the use of block
9902. When the user wishes to execute this command (knowing the state of the
command), he or she can enable the command with the Block 9902 request.