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Category Articles 
How do I deal with an unsigned integer in an SLC, PLC5, or MicroLogix processor?
Viewed 1 times since Tue, Jan 23, 2007
Scenario: A device that uses an INT value to represent a range of 0 to 65535, but in the processor the INT tag has a range of -32768 to 32767. Since the A/B processor does not have an unsigned Integer data type, you will need to convert this value... Read More
What is the difference between the 3150-MCM and the MVI46-MCM
Viewed 1 times since Tue, Nov 28, 2006
The MVI46-MCM: Is the latest Modbus module for the Allen-Bradley ;SLC platform Provides a debug port which allows the user to view module configuration and status Provides a built-in data analyzer for troubleshooting communication... Read More
When using the sample ladder I get an M0/M1 file reference error in my SLC processor if the MVI46 or 3150 is not in Slot 1.
Viewed 1 times since Tue, Nov 28, 2006
The M0 and M1 files are slot referenced. The second digit in the address represents the slot number. If the MVI46 or 3150 module is in slot 1 (next to the processor), then the file reference is M0:1.XXXX and M1:1.XXXX If the module is in slot 5,... Read More
Is the DH-485 port on the 3150 module available for use?
Viewed 1 times since Tue, Nov 28, 2006
No, the ProSoft 3150 product line is based on the Allen-Bradley KE module, which supports DH-485. On the 3150 products, the DH-485 port is disabled. The two serial DB9 ports are available to the user. Read More
My 3150-MCM is configured to have no Write Data, only Read Data. Occasionally, I am seeing my data overwritten with what appears to be configuration data.
Viewed 1 times since Tue, Nov 28, 2006
3150-MCM write block count and write block start are both set to 0. The write block start parameter must be set to a value which does not overlap with the read data area. A write start value of 75 will generally take care of this problem. In the... Read More
What is the difference between 3150-MCM and 3150-DFM?
Viewed 1 times since Tue, Nov 28, 2006
The 3150-MCM speaks Modbus communication. The 3150-DFM speaks DF1 communication. Related Keywords: 3150-MCM 3150-DFM 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
My 3150-MCM block IDs are incrementing until I connect the communications cable. Once the cable is connected, the block ID stops incrementing.
Viewed 1 times since Tue, Nov 28, 2006
Verify the cable matches the diagram on page 50 of the user manual. If pins 7 and 8 are not jumpered, and there is communications on pins 1 or 9, your backplane transfers will fail. The error status data will also show an error code of 255. Read More
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