Axis Off (Mode 4); Reference Point (Mode 5) - Siemens SIMATIC S5 Manual

Positioning module 1p 247 for stepper motors
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Description of the Individual Opera!jng Modes
Note
speed achieved at maximum frequency. The limits are 1-65000 mm/min (or 1-
650000,1 irlmin or 1-65000 decJmin). If this speed range would otherwise be
exceeded, the speed is changed to the lower or upper limit and the error message
"speed range exceeded" is output.
4.2.2

Axis Off (Mode 4)

After the IP247 starts up, this is the default mode.
In this mode, C0M247 can only enter a start command. FB 164 can enter any commands. These
commands are converted to a stop command for the current mode by the IP247. This means
that any positioning job can be aborted by a command in this mode. Aborting a mode with "axis
off" does not change the IP247 to the "axis off" mode. The C0M247 test display and FB 164 still
contain the aborted mode along with the stop command.
4.2.3

Reference Point (Mode 5)

Mode 5 is used to calibrate the axis. This means the following:
Reference point approach: the reference point is located by a calibration run. The refer-
ence point precontact (e.g. BERO) and the zero reading of the excitation pattern counter
are identified (synchronization = yes).
Set reference point: the current position of the axis (at rest) is assigned the coordinate of
the reference point stored in the machine data. The excitation pattern counter is not reset,
In each case, an error-free machine data record is required on the module. The coordinate of the
reference point is stored in the machine data. The direction of approach to the reference point
and the speeds for approaching the reference point are also contained in the machine data re-
cord.
Note
On correct completion of mode 5, the checkback signal "reference point set" is sent. (=> Sec-
tion 2.7 "AxisAttributes").
If the reference point is not set, the software limit switches stipulated in the machine data are not
evaluated and the following operating modes are blocked:
"incremental absolute" (mode 6),
"automatic" (mode 8),
"automatic single statement" (mode 9) and
"teach-in on" (mode 10).
Zero offsets and tool length offsets which were active before the calibration of the axis (=> Sec-
tion 4.3.5 or Section 4.3.6 "Absolute/Relative Zero Offset" and Section 4.3.8 "Tool Length Offset")
are retained and are included in the calculation of the reference coordinate.
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