history.txt

电路仿真程序 Classic Ladder is coded 100％ in C.It can be used for educational purposes or anything you wan

Classic Ladder history
----------------------

v0.1 (February 2001 - Not released)
    - The first lines of codes for calculating one rung and displaying it...
    - Basic elements and timers

v0.2 (30 April 2001 - First public release)

v0.2.8 (3 August 2001 - Featuring the Editor, but not totally completed)
    - Basic Editor (allow to modify only the current rung, properties uncompleted)
    - Makefile and modifications to allow independent object compilation.
    - Fixed bug for drawing in calc.c

v0.3 (18 August 2001 - Editor completed)
    - Variables Parser completed for Mxx,R and Txx,D and Txx,R
    - When clicking on "unusable" blocks (part of big element), it is as
      if you've clicked on the "alive" block itself.
    - For timers and monostables , parameters Base and Preset.
    - Can modify label of the rung to jump to for -(J) coil.
    - Label / comment of rung saved when edited.
    - We must not allow to change of current rung when editing one.
    - Add/Insert/Delete a rung, buttons usuable.
    - Load/Save/SaveAs/Run-Stop/About buttons added in main window
    - Load/SaveAs using path selection requester (datas should be in a directory).
    - Save rungs,timers,monostables parameters.

v0.4 (20 October 2001 - Arithmetic expressions evaluator)
    - New variables memory type : Words (integers)
    - 2 new elements using arithmetic expressions :
      COMPARE and OPERATE
    - Load/Save the file of arithmetic expressions
    - Possibility to spy the values of any variables by typing its name
      (added in the bottom of the vars window)
    - Added new types of variables : physical inputs (I) / outputs (Q)
      (not linked to anything in this version)
    - Resizing of rung take into account and thick lines for active wires
      (modifs initially done by Jiri Baum when integrating classicladder
      into the MAT project)

v0.5 (30 December 2001 - Real time support)
    - ClassicLadder_gtk.c created from file classic_ladder.c which keep only the
      global variables + 2 fonctions for loading/saving directory datas.
    - Global variables are now allocated and freed.
    - RTLinux support added.
      The refresh of the rungs are done in a RTLinux module in real-time.
      The Gtk application compiled for this version do not refreh the rungs.
      The Gtk application and RTLinux module share the same global variables
      allocated with mbuff.
    - Physical inputs and outputs have the same memory as the bits (VarBits + offsets).
      (if we make polling on them in RTLinux module with inb() and outb(),
      we could drive real hardware directly !?)

v0.5.1 (4 January 2002 - Parallels ports interface)
    - Direct hardware support of the parallels ports (in real-time version).
      Comment the line define HARDWARE_SUPPORT in classicladder.h if you do not want it !
    - Bug if there was no element in the first column, fixed (in function StateOnLeft())
    - Overflow possible (1 char) for label and comment strings in the rung, fixed.

v0.5.2 (26 January 2002)
    - Added in the editor the nice long connection (-->) to create rungs faster.
    - In Operate elements, you should now write the formulas like the following:
      A:=B instead of A=B
    - Draw a grid in edit mode.
    - #include <rtl.h> removed in hardware.h as it seems not to work with kernel 2.2
      causing an error when compiling : duplicate module kernel version...
    - Removed the warnings when compiling for RTLinux.
    - For big element, at the point you click, it is the left-top corner of the element
      which is inserted instead of right-top (the "alive" one).
    - Confirmation box before deleting the current rung (indispensable!)
    - 'New' button with a confirmation box also ;-)
    - Bug (exception) possible, if replacing for example a contact with a timer, where
      the number of the bit in the contact was greater than the timer number allowed.
      Now the number is erased if a simple element is not replaced by a simple
      element, to avoid that.
    - When deleting the current rung, the arithmetic expressions used on that rung were
      not deleted. Fixed.