Reference MVI69E-MBS ♦ CompactLogix Platform
User Manual Modbus Serial Enhanced Communication Module
Page 128 of 154 ProSoft Technology, Inc.
June 28, 2017
7.4.5 Command Control Blocks (5001 to 5006, 5101 to 5106)
Blocks 5001 to 5006: Port 1 Command Control
Blocks 5101 to 5106: Port 2 Command Control
If the CompactLogix or MicroLogix 1500-LRP processor sends a command
control block, the module places the commands referenced in the block in the
command queue. Commands placed in the queue with this method need not
have their enable bit set. Only valid commands are placed in the queue.
Up to 6 commands can be enabled and placed in the command queue with one
write request from the CompactLogix or MicroLogix 1500-LRP processor.
Blocks 5001 to 5006 or 5101 to 5106: Request from Processor to Module
Write Block ID: 5001 to 5006 for Port 1 or 5101 to 5106 for Port 2. The last digit
indicates how many commands are to be placed in the command queue by this block.
Index in the command list for the first command to be entered into the command
queue (applies to blocks 5001 to 5006 and 5101 to 5106).
Index for the second command (applies to blocks 5002 to 5006 and 5102 to 5106).
Index for the third command (applies to blocks 5003 to 5006 and 5103 to 5106).
Index for the fourth command (applies to blocks 5004 to 5006 and 5104 to 5106).
Index for the fifth command (applies to blocks 5005 to 5006 and 5105 to 5106).
Index for the sixth command (applies to blocks 5006 and 5106).
Where n = 60, 120, or 240 depending on the Block Transfer Size parameter.
Blocks 5001 to 5006 or 5101 to 5106: Response from Module to Processor
Read Block ID: 5001 to 5006 or 5101 to 5106 requested by the processor.
Write Block ID: To be used by the processor in its next Write block.
Number of commands in the block placed in the command queue.
Number of commands in the command queue for the specified port.
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