6ES7811-0CA01-0YX2 Siemens SIMATIC S7 S7 GRAPH Original Brand New

• Overview:
  The complete sequence structure can be represented.
• Single sheet view:
  The sequence structure, the step enabling conditions and the step actions can be displayed together on one sheet.
• Detailed display:
  The actions and transitions (with step enabling conditions) belonging to a step and the interlock and supervision conditions are displayed together.
• Flexible sequencer structure:
  With simultaneous and alternative branches, jumps within sequencers, step enabling and disabling, the user has a large number of possibilities for describing the task. Any number of sequencers can be configured in the same block.
• Languages:
  The available languages enable simple programming of conditions and actions for the user.
• Online functions:
  Display of active steps, status of the interlock, supervision and step enabling conditions, as well as executed actions.
• Performance:
  Good performance is achieved through the selective processing of the steps. The processing time of a sequencer is independent of the number of steps.
• Linking to project-wide documentation system (DOCPRO).
• Memory requirements of the administration part can be adjusted as required;
  S7-GRAPH offers different configurable compiler options to integrate the general management part of the sequencer block:
  • “Runs standalone” option:
    The administration part (approx. 5 KB) is contained in every function block generated by S7-GRAPH. This is the solution for small applications with only one sequencer block.
  • Option with “standard FC”:
    The administration part is stored in a separate block which only exists once per project and is used by all sequencer blocks. Depending on the type of this standard FC, the memory requirement is 8 or 10 KB.
• System function “FC 73” (as of V5.1):
  The FC 73 enables a lower-memory solution of under 8 KB, which is particularly interesting for the smaller CPUs of S7-300. However, the following restrictions apply when using the FC 73:
  • The created blocks are not capable of diagnostics.
  • Visualization of the created blocks is limited.
• Synchronization functionality:
  Sequencers can be controlled and synchronized with the current state of the plant/machine. In the event of program changes with download of the instance DB, the sequence is automatically reset to the basic setting. By means of the “Control sequence” function, it is now possible to set and reset steps directly from the programming device so that the sequence can be reset to the state of the plant before the program change. Synchronization can also be performed directly from the programming device. All transitions and interlock conditions are automatically acquired in the process and the possible steps are marked. Then, the user only needs to select and activate the step or steps.
• User-defined call interface:
  For the call interface of the sequence block, there are two possible options:
  • Predefined parameters sets, choose between Mini, Standard and Maximum.
  • User-defined parameters for flexible adjustment to the requirements of the application.
• Extensive diagnostic functions:
  Identification of error causes by displaying or signaling the faulty step. Furthermore, inclusion in the SIMATIC diagnostics concept with SIMATIC ProTool/Pro and SIMATIC ProAgent enables the simple integration of Operator Panels and WinCC for fault display with plain text and for display of the causing signals (criteria analysis).
• Advanced printing functions (as of V5.1):
  • A page break is always inserted after a “step plus transition”.
  • A page break can be set at sequence/graph end.
  • A separate comment can be entered for each graph.
• Improved window structure (as of V5.1):
  The S7-GRAPH work window only contains the sequencer to be edited. All additional information required for programming can be shown and hidden as required by the following windows:
  • Information on the interface of the block (block parameters and tags).
  • Used operands (including status display for all data types).
  • Cross-references to other points of use of operands in the program.
  • Used symbols from the symbol table.
• Simultaneous selection of multiple objects with the usual Windows procedure (as of V5.1):
  • Lasso function (selection frame around the desired elements) with “cut, copy, paste” for simple and fast copying and deletion of steps and transitions.
  • Items that are not next to each other can be selected with the “CTRL” button.
  • In parallel structures, individual branches or graphs can be selected and deleted with the lasso function.

Mode of operation

In the sequencers, the individual steps of a process and the transitions to the next steps are displayed as rectangles and lines (picture). In the steps, actions can be triggered and their execution can be controlled by so-called “qualifiers” (e.g. time-delayed or conditional execution). For example, if a drilling process is described with a sequencer, “Sink the drill” is a step and “Actuate the associated motor” is an action.

The conditions under which a transition to the next step should take place are described in the transitions. In the “Drilling process” example, the step-enabling criterion of the sequencer would be met with the “Lower end position reached” condition.

In addition, interlock and supervision conditions can be defined for each step.
The execution of actions can be prevented with an interlock. Supervision conditions serve to identify sequence errors. All conditions (transitions, interlocks and supervisions) can be programmed in either LAD or FBD.