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Category Articles 
What are the power requirements for the MVI69 CompactLogix modules?
Viewed 1 times since Tue, Nov 28, 2006
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 4 MVI69L modules require 450ma @ 5 volts and have a Distance Rating of 4 The 24v... Read More
How to configure more than 100 commands per port when using an MVI46-MCM, MVI69-MCM, or the MVI56-MCM as a Modbus master?
Viewed 1 times since Tue, Nov 28, 2006
Master command list contains up to 100 individual entries. Event command control blocks may be used to send additional Modbus commands directly from the ladder logic to one of the master ports. Read More
What causes a conditional command to be issued?
Viewed 1 times since Tue, Nov 28, 2006
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... Read More
How to avoid slow data updates on a Modbus network with an MVI56(E)-MCM or MVI69-MCM when some Slaves are either not on-line or not functioning correctly?
Viewed 1 times since Wed, Mar 19, 2008
A customer wrote: "Prosoft Modbus communication modules for Allen Bradley, like MVI56-MCM, experience timeout problems and polling delays on RS-485 multipdrop networks if slaves are powered off or faulty. For example, if we... Read More
How can I configure the module to store and initialize input values on reset or powerup?
Viewed 1 times since Tue, Nov 28, 2006
You can initialize the input data (ReadData) with cached values from the processor on these In-Chassis modules so that these values do not get reset to 0 during a module reset or powerloss. To do this the parameter labeled "Initialize Input Image" or... Read More
What is the purpose of the UseGuardBand/GuardBandTime or InterCharacterDelay parameters in an MCM module?
Viewed 1 times since Tue, Nov 28, 2006
Due to timing variations in various Modbus devices, it is possible for a Modbus master to have problems sending write commands to the MCM slave port while having no issues with read commands. In such cases, the "Use Guard Band" and "Guard Band... Read More
Where are the on-board jumper positions defined for my MVI module?
Viewed 1 times since Tue, Nov 28, 2006
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. Read More
Which of your products support RS-485 serial protocols?
Viewed 1 times since Wed, Feb 6, 2008
Almost all ProSoft solutions for serial based protocols support RS-232C, RS-485 and RS-422 electrical interface types, but equally important is the 'language' or application layer protocol needed for your application. ProSoft... Read More
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