Modular air logic devices replace PLCs for pneumatic controls

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Modular air logic devices replace PLCs for pneumatic controlsParker Hannifin's latest modular air logic devices are efficient and cost-effective for improving productivity, reliability and profitability of pneumatic circuits in a wide range of applications. In particular, the latest air logic devices can be used as an alternative to conventional PLCs for managing smaller or less complex pneumatic circuits, and in areas where there is no electrical supply or where compliance with the ATEX directives is required.

Parker's air logic system comprises a series of compact modules that operate in response to the condition of inlet and exhaust signals from connected upstream pneumatic devices, effectively replicating the operation of electrical switches and relays. They can therefore be used individually or combined to create a range of simple or advanced functions.

For example, when used as individual in-line modules they can provide passive AND/OR functions. Alternatively, modules can be grouped together and mounted on standard rails, on sub-bases with a common air supply or in cabinets to provide active AND, OR, NOT, YES and MEMORY functions, with functionality being extended still further through user-selectable cascade or common input modes.

Modules are designed to plug together quickly and simply, with all inlet and exhaust connections being front-mounted, and can easily be reconfigured if the requirements of the application change. For rail or sub-base mounted systems this makes it possible to halve the amount of piping that would otherwise be needed. Operating pressures can be between 3 and 8bar, at temperatures from -40 to +60degC, with modules typically having a response time under 3ms and an operating life greater than 10million cycles at pressures of 6bar.


Parker's latest air logic system is lubrication-free, incorporates pressure test points as standard, and is available with a range of accessories. These include time delays, bleed sensors, solenoid actuators, pressure switch relays and modular sequencers. The latter are designed to provide an easy-to-use method of controlling machines that need to go through a defined set of cycles.

Parker's European Product Manager for Air Logic, Claude Barrabes, states: "The strength of our air logic products lies in their ability to provide an extremely reliable and efficient method of configuring and controlling pneumatic circuits in applications where an electrical supply is unavailable or where ATEX controls apply; typically, these include the chemical, mining, transport and offshore sectors. Just as importantly, Parker air logic can be used in equipment such as robotic welders, where high electromagnetic fields can adversely affect electromechanical devices, and also offer a cost-effective alternative to PLC-controlled systems, where our products are far simpler to set up and operate without the need for specialised programming knowledge."

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