Posted on Tue, Jul 26, 2011 @ 7:23 AM
When setting up the Modbus RTU Master/Slave over an RS485 network, a three-wire cable is required to connect back to the interface converter. The Simple NULL Modem cable with external +24 vdc power is recommended, but the Allen-Bradley 1761-CBL cable is also functional. To begin, plug the cable to the round eight-pin mini DIN receptacle and set the P10 Jumpers for RS-485 on the Catalyst.
Parametric changes are also required within the RSLogix 500 and Alarmware to synchronize the Modbus Drivers. Here are the steps:
1. Connect the MicroLogix to your PC using the required 1761-CBL cable
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Posted on Tue, Jul 12, 2011 @ 4:20 AM
The Verbatim Gateway system—interfaced with an Allen-Bradley MicroLogix family of PLCs containing a native Modbus RTU Slave driver—performs alarm and monitoring functions with existing wiring to PLCs as inputs via data communications.
In order to facilitate data communications via Modbus RTU Master/Slave over RS232 data interface, RACO provides a NULL Modem serial cable, VAB-1. This cable has the RJ-45 connector required for the system.
Below are instructions on how to integrate MicroLogix to Verbatim Gateway via Modbus Protocol over RS232.
Communication setup for Allen-Bradley Mi... Continue Reading
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Posted on Thu, Mar 24, 2011 @ 11:27 PM
Interfacing RACO’s Catalyst system with Allen-Bradley’s MicroLogix PLCs allows Catalyst to use existing wiring for alarm notifications and data logging. The following tips will get you started:
1. Assemble your components: For proper setup, you will need RACO’s Catalyst system and Alarmware software, Allen-Bradley’s MicroLogix PLC and RSLogix software and the coordinating cables from each company.
2. Set up MicroLogix communications: Connect MicroLogix to your PC with the cable, then launch the RSLogix software. Using the software, set the communications driver to Modbus RTU sl... Continue Reading
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