I almost can’t trace back when the YS1700 launched, but based on the YS1700 successor the Yokogawa YS170 was discontinued in 2008. Therefore I assume the Yokogawa YS1700 has been launched since 2008. This new controller upgrades with several features, for instance, the new LCD, shorter body length, 1000 steps text Program and 400 modules of Function Blocks.
Text Program is a series of programming instructions that call to the controller to perform specific functions. It reminds me of the Motorola 6800 microprocessor instruction code back in college time.
The number of steps has been increased from 200 in YS170 to 1000 Steps in YS1700. This improvement makes the YS1700 as powerful as any programmable controller in the market.
Function Block Programming
Text Program vs. Function Block
Text program is a bit old school as a programming method, and it involves very long and challenging to understand programming sequences. It becomes difficult when the text program grows more extensive than a few hundred steps. It will be even worse when coming to the maximum of 1000 Steps
Function Block is far more modern than the Text Program and makes it possible to identify any error made during the programming. The visualized GUI modules make it a lot easier to understand the program flow too.