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Hello List,
I have encountered an interesting problem with an A-B ControlLogix PLC. The PLC in question is a 1756-L1 processor without any memory modules. The
system is in a 10 slot chassis with a ControlNet and Ethernet Comm module as well as a couple of local I/O modules. The ControlNet module is
communicating with 6 ControlNet Flex I/O drops.
The system is operating normally. However, I cannot establish a programming connection with the processor through the serial port. RSLinx is configured correctly and can "see" the processor, backplane and modules.
I am receiving two (2) different error messages from RSLogix-5000 when I attempt to go On-Line with the controller through the serial (DF1) port.
error #1: Failed to go online with the controller. No open connection. error #2: Failed to go online with the controller. Invalid communications path or controller not responding.
I have double and triple checked RSLinx and RSLogix-5000. I can go On-Line with other ControlLogix and FlexLogix processors through their serial ports just not this one processor.
I have double and triple checked the serial port configuration stored in the project file for the processor. All settings are normal factory default
settings.
Anyone got any idea or encountered this problem before?
Bradley G. Hite
Intertech Inc.
mailto:[email protected]
http://www.myplc.comTeaching Practical Skills for a Technological World
I have encountered an interesting problem with an A-B ControlLogix PLC. The PLC in question is a 1756-L1 processor without any memory modules. The
system is in a 10 slot chassis with a ControlNet and Ethernet Comm module as well as a couple of local I/O modules. The ControlNet module is
communicating with 6 ControlNet Flex I/O drops.
The system is operating normally. However, I cannot establish a programming connection with the processor through the serial port. RSLinx is configured correctly and can "see" the processor, backplane and modules.
I am receiving two (2) different error messages from RSLogix-5000 when I attempt to go On-Line with the controller through the serial (DF1) port.
error #1: Failed to go online with the controller. No open connection. error #2: Failed to go online with the controller. Invalid communications path or controller not responding.
I have double and triple checked RSLinx and RSLogix-5000. I can go On-Line with other ControlLogix and FlexLogix processors through their serial ports just not this one processor.
I have double and triple checked the serial port configuration stored in the project file for the processor. All settings are normal factory default
settings.
Anyone got any idea or encountered this problem before?
Bradley G. Hite
Intertech Inc.
mailto:[email protected]
http://www.myplc.comTeaching Practical Skills for a Technological World