UTAdvanced^® Digital Indicating Controllers

The UTAdvanced Digital Indicating Controller now comes standard with a new ladder sequence function.

By creating ladder programs incorporating control functions, you can perform interlock processes, control through connection via of controller and peripheral I/O, and other processes that were difficult to manage with traditional indicating controllers alone. Here we introduce a method for programming an alarm function using the ladder sequence function. The UTAdvanced Digital Indicating Controller already comes standard with an alarm function. However, in order to describe the basic operation of the ladder sequence program, we provide an example of building a "measured value upper limit alarm" with a ladder program.

Name of function: "Measured value upper limit alarm"

When the measured value exceeds an alarm setpoint (P1), alarm output (Y_AL1) turns ON, and when the value falls below the alarm setpoint (P1), alarm output (Y_AL1) turns OFF. The width of the alarm hysteresis (P2) is contained in the alarm setpoint.

• DAT registers: Registers used to store computed data and other values.
• P registers: Parameters that can be set or changed on a controller. These can be used in the ladder program.
• C10: Register for a constant. Represents "10."

In this sample program, we allocate relay output (Y_AL1) to set D01(ALM1) as the alarm output terminal.

[Program Description]

The internal data format of the UTAdvanced omits the decimal. Also, measured and alarm values are multiplied by 10 because the relational operators of the ladder program (such as ">") can only compare integers. (In this example, the measured value registers hold values from 0.0 to 1000.0.)