DeviceNet Thick Cable Communication Media
DeviceNet network can use Thick Cable, Thin Cable, and Flat Cable types for communication. Some of the features and qualities of the thick cable type used in DeviceNet networks are:
The Signal pair (#18) is the blue/white wire
Power pair (#15) is the black/red wire
PVC/nylon insulation on power pair
Industrial temperature range
Storage: -40o C to +85oC
Operating: -20o C [...]
Some Good Automation & PLC Books
Here is a list of suggested books to read on automation, control, and PLCs:
Fundamentals of Programmable Logic Controllers, Sensors, and Communication ~ $110.00
Author: Jon Stenerson
Published: January 2004
Content:
Safety/logout/tagout
Major brands of PLCs
Input/output modules and wiring
IEC 61131-3 programming
Communications, including industrial buses
Sensors, sensor wiring, and applications
Supervisory. Control and Data Acquisition (SCADA)
Instrumentation and process control Fundamentals of robotics
Programmable Logic Controllers [...]
Repeaters in ControlNet Network Topologies
Repeaters can be used in various topologies in ControlNet networks. Following are the four topologies with their features:
Bus Topology
Repeaters have to be in series.
This is the most basic (and more common) layout
Star Topology
Repeaters are configured as hubs in this configuration
Tree Topology
Repeaters have to be in parallel form
This formation is a combination of Star and Bus [...]
Electronic Keying Mismatch in RSLogix
There are few major reasons why you would get electronic keying mismatch error in RSLogix.
Major / Minor Revisions
If the major or minor revisions of the module in the chassis does not match the one set in the program you will get the keying mismatch error.
Catalog Number of the module
If the catalog number of the module [...]
ControlLogix Message Instruction Path
To write a message instruction (MSG) in ControlLogix one needs to give it a path to define where it needs to go. Following is how to set that communication path.
The path looks something like this:
What do the numbers mean? Pay attention that the numbers below don’t necessary correspond to the position in the address.
Back plane [...]
What does OUI Stand for?
OUI stands for Organizational Unique Identifier
What do CAN, WAN, GAN, LAN, MAN Stand For?
These are all networks related terms.
CAN: Campus Area Network
WAN: Wide Area Network
GAN: Global Area Network
LAN: Local Area Network
MAN: Metropolitan Area Network
How to Inhibit a Task Programmatically in ControlLogix
To programmatically inhibit a task in ControlLogix (RSLoigx 5000) you have to use the SSV instruction.
ControlLogix Coordinated System Time
In ControlLogix the coordinated system time is 64 microseconds.
ControlLogix Flashing Green I/O LED Controller
In ControlLogix flashing green I/O LED means Problem with I/O configuration however it is not a major fault.