stl - PLC Programming & Automation

Moving an S7-315 Program onto an S7-1500: What the Migration Converts and What It Hands Back to You

The two-stage path from a STEP 7 V5.x project to an S7-1500 program, with the CPU 315-2 PN/DP rack and its addresses on one side and the CPU 1515-2 PN with no modules on the other

A CPU 315-2 PN/DP with 6ES7315-2EH14-0AB0 on the label maps to a CPU 1515-2 PN, 6ES7515-2AM01-0AB0, in the Siemens migration guide’s CPU table, and the S7-1500 migration does not happen in one move. It happens in two, the second of which is a right-click on the old CPU in the device view called Migrate to … Read more

Scaling an Analogue Input in STL: The Integer Maths and Where It Overflows

by PLC

Chart of the product of the raw count and the scale factor against the DINT limit of 2147483647, showing the ceiling at 77672 for a full-scale reading of 27648 and at 65538 for a raw word of 32767, beside the STL statement list in the order that keeps precision

A DINT stops at 2147483647, and 27648 multiplied by 77673 is 2147503104. That is the whole of the problem with fixed-point scaling in STL: the arithmetic is exact right up to the statement where it is not, and *D reports the crossing by setting OV and OS rather than by refusing to run. Here is … Read more

PLC Programming Example

by PLC

We can use the “FOR DO” command structure to find the sought value in an array. In the example below, I will explain how to run the “FOR DO” command in the STL language that I have prepared for you and understand the index number of a number in the array or whether this number … Read more

How to learn plc programming and plc software

by PLC

Plc programming If you are good at automation, you can easily learn how to use plc programs in plc programming. Programming always has a self-improving structure and you need to write and try programs to improve yourself. Especially if you can read programs written by others. then it means that you can write a PLC … Read more