Commissioning - Siemens SIMATIC S7-1200 Manual

Motion control is easy

10.7 Commissioning

Note
If the homing search does not function as you expected, check the inputs assigned to the
hardware limits or to the reference point. These inputs may have had their edge interrupts
disabled in device configuration.
Examine the configuration data for the axis technology object of concern to see which inputs
(if any) are assigned for "HW Low Limit Switch Input", "HW High Limit Switch Input", and
"Input reference point switch". Then open the Device configuration for the CPU and examine
each of the assigned inputs. Verify the "Enable rising edge detection" and "Enable falling
edge detection" are both selected. If these properties are not selected, delete the specified
inputs in the axis configuration and select them again.
10.7 Commissioning
"Status and error bits" diagnostic function
Use the "Status and error bits" diagnostic function to monitor the most important status and
error messages for the axis. The diagnostic function display is available in online mode in
"Manual control" mode and in "Automatic control" when the axis is active.
Table 10- 40 Status of the axis
Status Description
Enabled The axis is enabled and ready to be controlled via motion control tasks.
(Tag of technology object: <Axis name>.StatusBits.Enable)
Homed The axis is homed and is capable of executing absolute positioning tasks of motion control
instruction "MC_MoveAbsolute". The axis does not have to be homed for relative homing. Special
situations:
•
•
(Tag of technology object: <Axis name>.StatusBits.HomingDone)
Error An error has occurred in the "Axis" technology object. More information about the error is available
in automatic control at the ErrorID and ErrorInfo parameters of the motion control instructions. In
manual mode, the "Last error" field of the control panel displays detailed information about the
cause of error.
(Tag of technology object: <Axis name>.StatusBits.Error)
Control panel active The "Manual control" mode was enabled in the control panel. The control panel has control priority
over the "Axis" technology object. The axis cannot be controlled from the user program.
(Tag of technology object: <Axis name>.StatusBits.ControlPanelActive)
252
During active homing, the status is FALSE.
If a homed axis undergoes passive homing, the status is set to TRUE during passive homing.
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Manual, 03/2014, A5E02486774-AF