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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
Baud rate entries greater than 32767 in ProSoft Modules
Viewed 1 times since Tue, Nov 28, 2006
Since RSLogix uses signed integers, the highest positive value that can be entered is 32767.  To avoid this issue, when specifying higher baud rates, Prosoft modules only require the first 3 digits of the baud rate. e.g., to enter a... 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
Do the serial ports on my MVI56 module provide any electrical isolation?
Viewed 1 times since Tue, Nov 28, 2006
The two application serial ports provide 1000 volts of electrical isolation between the port and the ControlLogix backplane. The debug/configuration port provides no electrical isolation. Note: None of the ports provide any electrical isolation... 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
Connecting RS232/Channel 0 port on my V17 or V18 Logix processor to connect to my ProSoft device halts communications..
Viewed 1 times since Wed, Aug 4, 2010
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... Read More