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What causes a conditional command to be issued?

A conditional command is useful when the same value does not need to be written to the end device continuously, but rather on change. A conditional write command is scanned based upon its poll rate (like all other commands).  The difference is that it will not be execut...

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What are the power requirements for the MVI69 CompactLogix modules?

MVI69 modules require 800ma @ 5 volts and have a Distance Rating of 2 (slots from a power supply) MVI69E modules require 500ma @5 volts and have a Distance Rating of 4MVI69L modules require 450ma @ 5 volts and have a Distance Rating of 4The 24v requirements for all of these MVI ...

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Where are the on-board jumper positions defined for my MVI module?

On bottom of the circuit board for any MVI products, you' ll find three jumper banks: COM1, COM2, and Setup.Each jumper position is labeled 232, 422 and 485....

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Connecting RS232/Channel 0 port on my V17 or V18 Logix processor to connect to my ProSoft device halts communications..

This is a known issue with Allen Bradley and AB Technote #67950 has been created. "There is an anomaly with all Logix processors in V17 and V18 in which the serial port UART may stall when transmitting packets.  This has only appeared on certain devices connec...

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