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Entry-level models added to series of digital indicating controllers

16 December 2009

Yokogawa Electric Corporation has released the UT35A (quarter DIN size) and the UT32A (one-eighth DIN size), two entry-level models in the UTAdvanced(TM) series of digital indicating controllers.

Entry-level models added to series of digital indicating controllers
Entry-level models added to series of digital indicating controllers

These low-cost models have a sequence control function that is based on the general-purpose ladder logic programming language, and are targeted for use in the single-loop control of production equipment.

The UTAdvanced Series adopts an open system architecture with an Ethernet communications interface. They are compatible with Modbus/TCP protocol and also (as an option) with the Profibus DP protocol. In addition to eliminating the need for dedicated communication programs and converters for connecting to devices such as data-acquisition units and/or PLCs, this feature makes it easy to develop optimal multi-vendor systems for users.

The controllers have a fixed control scan period of 200 ms and 300 steps for ladder programming, compared with the three control scan periods and 500 steps in the high-end UT55A and UT52A models. However, this is more than adequate for the single-loop control of production line installations.

The UT35A and UT32A also have capabilities that to date have been found in only high-end controllers, including a ladder language based sequence control function; support of the Ethernet or RS485 interfaces and Modbus or Profibus -DP communication protocols; a colour LCD display; and operation guidance functions including navigation keys.

Also included is a user default function. Not only is it possible via a simple function to reset the unit to factory default settings: it is also possible for the user to define his own 'default profile' to which it is possible to return. This means that an engineer can always quickly revert to a known working setup profile - without starting again from scratch or having to load a configuration file from a PC.

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