17465 "Quick Start" Message (Msg) - Allen-Bradley MicroLogix 1400 Instruction Manual

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# 17465 "Quick Start"
Message (MSG)
Publication 1766-RM001A-EN-P - October 2008
Problem #3: Some of my outputs will not turn On or Off when the
ladder logic appears to indicate that they should.
Solution:OMB (Output Mask Bits). Verify what the OMB has been
configured for in the HSC function file. If an output(s) has been assigned
to the HSC for control, then the output(s) will not be controlled anywhere
else in the ladder program. Only the HSC will have control over these
outputs.
Communications Specifications:
The MicroLogix 1400 processors contain a total of (12) Message Buffers.
(8) Incoming Any incoming MSG's, Communications, and/or
responses to a command the ML1400 initiated.
(4) Outgoing Any outgoing MSG's, Communications and/or
responses to incoming request for data.
The Outgoing queue also supports unlimited queuing. This means that
even if a buffer is not available the MSG will simply wait until one of the
outgoing buffers becomes available and then transmit.
NOTE:If a message has been waiting in the queue, at the moment of
buffer availability, the most current data will be sent, not the data that was
available at the time the message instruction was first scanned true.