ProSoft Technology MVI56-103M - Manual (Page 109)

MVI56-103M ♦ ControlLogix Platform Reference
IEC 60870-5-103 Master Communication Module User Manual
ProSoft Technology, Inc. Page 109 of 152
February 22, 2013
5.4.4 Read Command Error List Block (9950)
Block 9950 identification code requests the Command List Error Table from the
module for the 1000 user-configurable commands. The format for the block is
shown below:
Word Offset
in Block Data Field(s) Description
0 Block ID This field contains the value of 9950 identifying the block type
to the module.
1 Number of
Commands to
report This field contains the number of commands to report in the
response message. The value has a range of 1 to 200.
2 Start Index of First
Command This parameter sets the index in the command list where to
start. The first command in the list has a value of 0. The last
index in the list has a value of MaxCommands -1.
3 to 247 Spare Not Used
The module will respond to a valid request with a block containing the requested
error information. The following table describes the format of this block.
Word Offset
in Block Data Field(s) Description
0 Reserved Reserved (0)
1 Block ID This is the next block requested by the module.
2 Number of
Commands
reported This field contains the number of commands contained in the
block that must be processed by the PLC. This field will have
a value of 1 to 200.
3 Start Index of First
Command This field contains the index in the command list for the first
value in the file. This field will have a value of 0 to
MaxCommands-1.
4 to 203 Command List
Errors Each word of this area contains the last error value recorded
for the command. The command index of the first value
(offset 4) is specified in word 3 of the block. The number of
valid command errors in the block is set in word 2 of the
block. Refer to the command error list to interpret the error
codes reported.
204 to 248 Spare Not Used
249 Block ID This field contains the value of 9950 identifying the block type
to the PLC.