28.10.2013

Interfaces - extremely versatile in combination

Machines developed in accordance with the latest state-of-the-art technology often work with highly integrated PC-based, programmable logic or special NC controls. All machine parts are linked via high-speed Industrial Ethernet. There are many applications, in which a quick signal pick-up directly at the rotary encoder makes an automation task much easier.
Incremental signals, which are acquired directly from the rotary encoder, are used for commutation and provide the necessary signals  for secondary speed control loops without any time lag - entirely without an additional measuring system. A decentralized control loop can directly receive SSI signals and consequently move to or maintain a position in the secondary position control loop even in the event of failure of the communication network. For operator information in-situ a simple value display which is connected via SSI is sometimes sufficient - a laboriously parameterized control panel with a network connection is not always necessary. In many applications the combination of complex interfaces (such as SSI, field bus or Industrial Ethernet) with a simple output signal solves the problem of integrating existing system parts with analog control technology into larger systems with modern interfaces.
TR's digital angle and position measuring systems are available with such interface combinations. The rotary encoder series with 65 mm outer diameter traditionally offers sufficient space for such combinations and the necessary connections.
The combination of PROFINET with an SSI output is now available. Two controls receive the position information via the interfaces, one directly via the SSI output, the other via high-speed PROFINET.
Field buses with SSI or incremental signals and Industrial Ethernet with incremental signals are already available. Combinations such as SSI, Analog and limit switches are naturally also feasible.
And not least, a rotary encoder with a combination interface also helps to avoid long machine downtimes during generation changes in control technology. As long as the old control still works, the direct interface (SSI) is addressed, and as soon as the new control is operational the system is switched to the field bus or Industrial Ethernet - all without having to replace the encoder. And just one type, which can be used in both configurations, needs to be stocked as spare part.