Overview
The YS1700 Programmable Indicating Controller includes over one-hundred computation modules for exponents, logarithms, temperature/presssure compensation, and other operations. In addition to the traditional text-based programming, the YS1700 now supports a graphical, function block programming format. This document provides an introduction to programming and debugging techniques using this modular format.

New Function (1): Function Block Programming
The YS1700 now has a graphical programming interface that allows you to arrange and wire modules smiply by dragging and clicking with the mouse. Programs can be spread across several pages, or divided by function into sub-programs.

New Function (2): Module Monitor
Previously, computed results were stored in a temporary register and could be checked via communications. With the new module monitor function, input values from the computation module and output computed results can be monitored online, making debugging much easier.

New Function (3): Simulated Input Function
The YS1700 includes a test run function for debugging purposes. Using the test run function makes debugging user programs much more efficient. The test run can be made in two modes: test mode 1 (TEST1), and a new test mode 2 (TEST2). The following introduces the new TEST2 mode.
When in TEST2 mode, the actual input terminals (analog and digital inputs) are disconnected from the Xn and DIn internal registers. Instead, you can change (simulate) the values input from the Xn and DIn registers via communications. Previously you would debug by connecting a voltage generator or contact signal to the signal terminal of a controller. By using TEST2 mode, you can now debug user programs without the need for these instruments.