Detailed Description
2.12 Block descriptions
PLC Basic Program Solution Line (P3 sl)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
2-211
Transfer of HMI signals to the interface can be deactivated by setting the value of the
parameter "MMCToIF" to "FALSE" in FB 1 (DB 7). "MMCToIF" can also be
activated/deactivated in the cyclic program by setting and resetting
(e.g., R gp_par.MMCToIF).
The following specifications apply to the feed override, axis travel keys and INC keys
depending on the active mode or on the coordinate system selected:
• Feed override:
– The feed override is transferred to the interface of the selected channel and to the
interface of the axes.
– The feed override signals are transferred to the NC channel in addition to the "Rapid
traverse override" (DBB 5) interface byte if the "Feed override for rapid traverse effective"
HMI signal is set (exception: Switch setting "Zero"). "Rapid traverse override effective" is
also set with this HMI signal.
• Machine functions for INC and axis travel keys:
– When the MCS is selected, the signals are transferred to the interface of the selected
machine axis.
– When the WCS is selected, the signals are transferred to the geo-axis interface of the
parameterized channel.
– When the system is switched between MCS and WCS, the active axes are generally
deselected.
The handwheel selection signals of the HMI are decoded and activated in the associated
(machine) axis interface or geo-axis interface of the relevant handwheel (only if FB 1
parameter "HWheelMMC := TRUE").
The LEDs on the machine control panel operate on the basis of the checkback signals from
the selections made.
Feedrate and spindle Start/Stop are not transferred to the interface, but output modally as a
"FeedHold" or "SpindleHold" signal. The user can link these signals to other signals leading
to a feed or spindle stop (this can be implemented, e.g., using the appropriate input signals
in FC 10: AL_MSG). The associated LEDs are activated at the same time.
The spindle direction (+, -) is not switched directly either, but made available as output
parameter "SpindleDir", permitting, for example, FC 18 to be parameterized. A spindle
enable signal is also switched via parameter "SpindleHold". One possible method of moving
a spindle directly is to preselect it as an axis so that it can be traversed via (axis) direction
keys.
If the machine control panel fails, the signals it outputs are preset to zero; this also applies to
"FeedHold" and "SpindleHold" output signals.
Multiple calls of FC 24 or FC 19, FC 25, FC 26 are permitted in
a single PLC cycle. In this
case, the first call in the cycle activates the LED displays. Moreover, all actions of the
parameterized block are executed in the first call. In the following calls, only a reduced level
of processing of the channel and mode group interface takes place.
The geometry axes are supplied with directional data only in the first block call in the cycle.
Single-block processing can be selected/deselected only in the first call in the cycle.
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