Setting The Step Control Mode - Siemens SIMATIC PCS 7 Programming And Operating Manual

Operating and monitoring SFCs

6.22 Setting the Step Control Mode

6.22 Setting the Step Control Mode
Setting step control mode
The step control mode defines the step response of the sequential control. The step control
mode changes the response of prepared or fulfilled transitions.
A button is displayed for an active operator request in all step control modes with the exception
of "T" if the user is is granted the corresponding operating permission.
You can change the step control mode in all operating states.
In this combo box, you set the step control modes that are described in the table:
Step control
mode
T
T or O
T and O
O
T / T and O
Note on Minimum Runtime:
The operator can shorten the minimum runtime of the step in step control modes "O" and "T
or O" by intervening sooner.
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Meaning
Transition:
The sequential control system is process-driven (running automatically). When a
transition is true, control passes to the next step or steps by deactivating predeces‐
sor steps and activating successor steps.
With transition or confirmation by operator:
The process or the operator controls the sequential control system. An operator
prompt is set for each successor transition of an active step, and the next step is
enabled after operator input is made. If the transition is true before the operator
prompt is acknowledged, control passes to the next step or steps without operator
intervention (automatically).
With transition and confirmation by operator:
The process and the operator control the sequential control system. When the suc‐
cessor transition of an active step is fulfilled, an operator prompt is set and the next
step is enabled only after operator input has been made.
Confirmation by operator:
The sequential control system is controlled exclusively by the operator. The transi‐
tions do not need to be true. An operator prompt is set for all successor transitions
of each active step, and the next step is enabled after the operator input.
Step-specific confirmation by operator:
The "Confirmation" ID is set or reset on a step-specific basis in the "Properties"
dialog box for the step. The sequential control system runs as follows:
● Process-controlled for steps without the "confirmation" ID.
Each fulfilled follow-on transition of an active step without "Confirmation" passes
on without operator input (corresponds to "T").
● Operator-controlled for steps with the "Confirmation" ID.
In the case of a fulfilled follow-on transition of an active step with "Confirmation",
an operator prompt is set and passed on after successful operator input
(corresponds to: "T and O").
Programming and Operating Manual, 05/2017, A5E41356392-AA
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