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How to Use the Yamatake SDC40A Digital Controller

The Yamatake SDC40A is a digital controller that can be used for various industrial applications. It has a large LCD display, a user-friendly interface, and various communication functions. In this article, we will introduce the main features and functions of the SDC40A, and provide some tips on how to use it effectively.

Features and Functions of the SDC40A

The SDC40A is a single-loop controller that can control various types of input signals, such as temperature, pressure, flow, level, and pH. It can also output various types of signals, such as relay, voltage, current, and pulse. The SDC40A has the following features and functions:


  • It has a large LCD display that can show up to four lines of information, such as process value, setpoint, output value, alarm status, and parameter settings.

  • It has a user-friendly interface that allows easy operation and configuration. It has four keys for menu navigation, four keys for parameter setting, and four keys for function selection.

  • It has various communication functions that enable data exchange with external devices, such as host computers, PLCs, and other controllers. It supports RS-232C and RS-485 serial communication protocols, as well as CPL (Controller Peripheral Link) communication network.

  • It has various control modes that can be selected according to the application requirements. It can perform PID control, ON/OFF control, manual control, cascade control, ratio control, and feedforward control.

  • It has various tuning functions that can optimize the control performance. It can perform auto-tuning, self-tuning, adaptive tuning, and manual tuning.

  • It has various alarm functions that can detect and notify abnormal conditions. It can perform high/low limit alarm, deviation alarm, rate-of-change alarm, loop break alarm, and sensor break alarm.

  • It has various protection functions that can prevent unauthorized access and operation. It can perform password protection, key lock function, parameter lock function, and write protection function.

How to Use the SDC40A Effectively

To use the SDC40A effectively, you need to follow some basic steps:

  • Install the SDC40A properly according to the installation manual. Make sure that the wiring is correct and secure, and that the power supply is stable and within the specified range.

  • Select the appropriate input/output type and range according to the sensor/transmitter type and range. You can use the parameter setting mode to configure the input/output settings.

  • Select the appropriate control mode according to the application requirements. You can use the function selection mode to configure the control mode settings.

  • Tune the controller parameters according to the process characteristics. You can use the tuning mode to perform auto-tuning or manual tuning.

  • Set the alarm functions according to the process specifications. You can use the parameter setting mode to configure the alarm settings.

  • Monitor and adjust the controller operation using the display mode and manual control mode. You can also use the communication functions to exchange data with external devices.

For more detailed information on how to use the SDC40A effectively, please refer to the user manuals or contact Yamatake Corporation or your dealer.


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