• QT250/800 2.5 CANopen Failsafe Actuator
The dual can option introduces some important changes to the product. By
replacing a single CAN driver with a Dual CAN driver, the product gives the
possibility for redundancy with several PLCs. If needed the faulty unit/signal
cable segment, is automatically isolated from the rest. As each node both reads
and writes on both inputs, more than one PLC can be used to control the ring.
Note! Due to its design, some latency will occur in each node. This results in lower
number of nodes per loop compared to a standard CAN node.
The Dual CAN option opens new solutions on a system level. Below is an example
of a system with improved redundancy compared with a standard system. The
actuators should be integrated through a stand-alone sub-system delivered by
Eltorque.
The solution illustrated in Figure 38 shows a ring connection with the Eltorque
Hybrid Marine Cable and Dual CAN communication from two sides. The Eltorque
Dual CAN actuators are connected to a cabinet with Eltorque valve control system
(E-VCS). In this example, pump starters are also connected to the E-VCS. Other
equipment, such as sensors can also be connected to the E-VCS. The E-VCS
includes an HMI interface on the cabinet and can also support an HMI interface
on main control level.
Figure 38: Eltorque Dual CAN Valve Control System (E-VCS) with valve and pump control
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