A virtual backplane is formed when the controller, modules, and power supply in an Allen-Bradley CompactLogix PLC are connected together.
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A maximum of ______________________________ devices can be a…
A maximum of ______________________________ devices can be attached to the trunk line of a DH-485 network.
Periodic tasks cause the controller to scan the code from th…
Periodic tasks cause the controller to scan the code from the top of the ladder logic diagram to the bottom.
The ______________________________ instruction is used to tr…
The ______________________________ instruction is used to transfer blocks of data to or from a memory location of another PLC.
Allen-Bradley SLC 500 series PLCs use the ____ standard.
Allen-Bradley SLC 500 series PLCs use the ____ standard.
The cable through which data and control signals flow on a n…
The cable through which data and control signals flow on a network is known as ______________________________.
Which routine is called from within another routine?
Which routine is called from within another routine?
A node in a PLC network may use ____.
A node in a PLC network may use ____.
In a Carrier Sense Multiple Access with Collision Detection…
In a Carrier Sense Multiple Access with Collision Detection (CSMA/CD), a node can transmit data ____.
A(n) ______________________________ protocol is a standard f…
A(n) ______________________________ protocol is a standard for the way nodes communicate on the network.