Technical data

Testing Using Program Status
21.1 Program Status Display
Programming with STEP 7
468 Manual, 05/2010, A5E02789666-01
21.1 Program Status Display
The display of the program status is updated cyclically. It begins with the selected network.
Preset Color Codes in LAD and FBD
• Status fulfilled: green continuous lines
• Status not fulfilled: blue dotted lines
• Status unknown: black continuous lines
The preset for line type and color can be changed under the menu command Options >
Customize, "LAD/FBD" tab.
Status of Elements
• The status of a contact is:
- Fulfilled if the address has the value "1,"
- Not fulfilled if the address has the value "0,"
- Unknown if the value of the address is unknown.
• The status of elements with enable output (ENO) corresponds to the status of a contact with
the value of the ENO output as the address.
• The status of elements with a Q output corresponds to the status of a contact with the value of
the address.
• The status for CALLs is fulfilled if the BR bit is set following the call.
• The status of a jump instruction is fulfilled if the jump is executed, meaning if the jump condition
is fulfilled.
• Elements with enable output (ENO) are shown in black if the enable output is not connected.
Status of Lines
• Lines are black if they are not run through or if their status is unknown.
• The status of lines that start at the power rail is always fulfilled ("1").
• The status of lines at the start of parallel branches is always fulfilled ("1").
• The status of the line following an element is fulfilled if both the status of the line before the
element and the status of the element are fulfilled.
• The status of the line following NOT is fulfilled if the status of the line before NOT is not fulfilled
(and vice versa).
• The status of the line after an intersection of a number of lines is fulfilled if:
- The status of at least one line before the intersection is fulfilled.
- The status of the line before the branch is fulfilled.