Electrical valve terminal link communicates on all levels
January 2004Valves, Actuators & Pump Control
Products & Solutions
Festo's new modular electrical terminal CPX - compatible with all fieldbus protocols and customer-specific installation standards - simplifies the exchange of information between electrical and pneumatic control levels for effective communication at any level.
The CPX terminal presents a truly professional image as an electrical peripheral device for valve terminals. Capable of being adapted to customer-specific connection concepts, it simplifies communication between sensors, valve terminals and the electrical controller level. Depending on the system concept involved, CPX can be combined either with MIDI/MAXI valve terminals to provide a high degree of modularity for harsh environments, or with CPA valve terminals subject to normal mechanical stresses, to provide optimum triggering of actuators. What is more, the open design of CPX, with its ability to fit quickly and easily into all kinds of applications, makes costly special designs unnecessary.
Installation is simple, thanks to an optimised design principle. The CPX has a physically separate connection panel and electrical section. This separation of the connector block, electronics module and manifold block allows permanent wiring, while still permitting fast replacement of the electronics module and, thus, more efficient rectification of faults.
Early detection of faults prevents downtime
With its diagnostics and preventive maintenance function, the CPX terminal helps enhance machine availability. It supports module- and channel-specific diagnosis, such as 'undervoltage' detection for outputs and valves, short-circuit detection for sensors and valves and open-load detection of missing valve coils. The diagnostics capability of the CPX is combined with a memory facility, which allows the CPX to store the causes of the most recent 40 faults, with data on the start and end of these. This makes it much easier to carry out fast faultfinding in electrical installations.
The CPX can be used in conjunction with the Festo CP installation system to create distributed structures consisting of valve terminals, the CPX itself and a drive and, thus, achieve faster cycle times. A particularly practical benefit is the small amount of wiring work required - an important factor for users such as the food industry and process automation.
The optionally available, handheld CPX-MMI facilitates commissioning and service. CPX terminals can be conveniently configured, set up and diagnosed - without programming or additional software - with the help of the handheld device, which can be connected to any CPX fieldbus node. Thanks to easy advance CPX commissioning, function tests can also be performed with the handheld device before connection to the fieldbus system.
At a glance
The CPX offers M12, M8, M12 8-pin, Harax, CageClamp or multipin sub-D connectors; IP65 or IP20; installation directly on machine or in control cabinet; preventive maintenance function in the form of condition monitoring of valves; access to integrated Web pages (FEC Web server) via Ethernet; up to 10 electrical modules plus field bus node; electrical modules with eight or four digital inputs, four digital outputs, eight digital inputs/outputs, two analog inputs or two analog outputs; CPX-Terminal macro library available for Eplan Electro-CAE software and can be operated as a valve terminal peripheral device even without pneumatics (remote I/O unit).
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