ProSoft Technology MVI56E-MNET/MNETXT - Manual (Page 121)

MVI56E-MNET / MNETXT ♦ ControlLogix Platform Reference
Modbus TCP/IP Interface Module User Manual
ProSoft Technology, Inc. Page 121 of 181
April 23, 2014
10 Modbus Function Code - This word contains the Modbus function code
for the command. 1
11 Device Database Address - This word contains the Modbus address in
the server device to be associated with the command. 1
12 to 247 Spare 236
When the module receives this request block, it builds the command, places the
command in the command priority queue (if the queue is not already full;
maximum capacity is 100 commands), and returns a response block to tell the
ladder logic whether or not the command has been successfully added to the
queue.
Block Response from Module to Processor
Word Offset Description
0 Reserved
1 This word contains the next write request block identification code.
2 This word contains the result of the event request. If a value of one (1) is
present, the command was successfully added to the queue. If a value of zero
(0) is present, no room was found in the command priority queue.
3 to 248 Spare
249 This word contains the block identification code 2000 requested by the
processor.
Word 2 of the block can be used by the ladder logic to determine whether or not
the command was successfully added to the command priority queue. The
command will fail if the queue for the port is already full at the time when the
Event Command block is received by the module.