An actuator sensor interface system controls low-level pneumatics. |
A new actuator sensor-interface (ASI) wiring system from Parker Pneumatic Div., is intended for use in low-level pneumatic automation systems requiring versatile, inexpensive cabling that is easy to install, operate, and maintain.
The modulated sine wave signal is so robust, stable, and reliable that cables can be run next to high-voltage welding systems without downgrading. ASI technology is compatible with any fieldbus or device network (such as Profibus and DeviceNet), requiring only an inexpensive gateway.
The ASI network can include up to 31 slave devices, with each device controlling four inputs and four outputs. Both master and slave devices can detect errors and ask for repeats. The network employs a flexible tree structure, which means slave devices do not have to be put in a line or a circle, and cables do not need a terminating resistor. Power and data move along the same, inexpensive, two-wire flat IDC (yellow) cable. Bus segments can be up to 100 meters long or run up to 600 meters using optically isolated repeaters every 100 meters. Slave address settings can be made offline with an inexpensive handheld programmer or dedicated master. Online programming is done using a dedicated master and a reserved newcomer default address.
A piezo valve from ASCO Valve, Florham Park, N.J., operates with minimal power. A piezo is a multilayer ceramic element that produces a change in state with low voltage. Applying the low voltage bends the ceramic arm which opens an orifice.
The valve line is intended for applications in intrinsically safe environments and fieldbus-based systems. The piezo operator is the first valve line suitable for fieldbus-controlled industrial processes. The piezo-ceramic technology uses only 8.4 mW to operate valves up to 1 in. in size with Cvup to 13.