ProSoft Technology MVI69-103M - Manual (Page 84)

MVI69-103M ♦ CompactLogix or MicroLogix Platform Reference
IEC 60870-5-103 Master Communication Module
Page 84 of 131 ProSoft Technology, Inc.
November 3, 2008
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 50.
2 to 61 Command
Numbers to enable These 50 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 n 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), can enable the command with the block 9902 request.
Event Message Block (9903)
Block identification code 9903 sends event messages received on the master
port to the processor.
Note: Events are recognized when using a COT = Spontaneous.
Word Offset in
Block Data Field(s) Description
0 Read Block ID 9903
1 Write Block ID
2 Event Count This field contains the number of events present in the block.
Values of 1 to 20 are valid.
3 to 12 Event 1 Event message
13 to 22 Event 2 Event message
23 to 32 Event 3 Event message
33 to 42 Event 4 Event message
43 to 52 Event 5 Event message
The format of each 10-word data region in the block is as follows:
Word Offset Definitions Description
0 Session Index/Sector
Index This field contains the session and sector indices used
to define the controlled unit in the module from which
the event was generated. The MSB contains the
session index and the LSB contains the sector index.
1 ASDU Type This field contains the ASDU type code for the data
contained in the message.
2 Function Code/Point
Index* This field contains the function code and the point index
associated with the event message. The MSB contains
the function code and the LSB contains the point index.