PLCs and Electrical Controls
The command center for a typical system will consist of a single Allen Bradley compact Logix E series PLC with Allen Bradley I/O components. The PLC and I/O chassis are mounted in NEMA12 enclosure. The main enclosure contains the PLC, circuit breakers, safety control relays, main power disconnect. The PLC will use Ethernet I/O and some discrete I/O signals to communicate with the Fanuc Robots.
All hardware will be industrial duty and is designed for industrial automation systems. All hardware mounted outside the main enclosure will be rated NEMA 12 or better (sensors rated at IP67). The electrical systems are constructed in accordance with NEC – NFPA79 standards.
Typical operator controls are performed through a 7” or an optional 15” Maple Systems Operator Interface Terminal. The Operator Interface Terminal will communicate with the PLC via a standard serial communication link. The command terminal displays “Status or Fault Messages” on the current state of the machine. Some basic data collection is included as standard (uptime / downtime, total parts completed etc.).
Error display, a message informing the operator why the line is down and what is causing the issue (will need to be discussed during the design phase).
Start the line cycle, (note all robots will need to be powered up and ready for operation first via the robot pendent and waiting for a cycle start signal from the command center. Note: There is no need to home robots as all Fanuc robots have absolute encoders.
DevLinks, Ltd. preferred method for communication is Ethernet I/O interface between a FANUC Robot and Rockwell (Allen Bradley) PLCs with EIP Scanner option. Adapter option is like a slave and it requires a scanner in the I/O network to initiate communication. Adapter option cannot drive physical devices such as EIP compatible relays or solenoids. Robot with adapter option cannot communicate with other robots with adapter option. This option only allows communication of discrete I/O status over Ethernet. Ethernet/IP uses Allen Bradley protocol and compatible with Ethernet I/O of Rockwell PLC.