P3: Basic PLC Program for SINUMERIK 840D sl
13.13 Block descriptions
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
1039
13.13.23 FC 19: MCP_IFM transmission of MCP signals to interface
Function
With the FC MCP_IFM (M-variant) from the machine control panel a range of 19 inch e.g. MCP 483 are
transferred to the corresponding signals of the NCK-/PLC-interface:
• Mode Groups
• Axis selections
• WCS/MCS switchover commands
• Traversing keys
• Overrides
• Key-operated switch
In the basic program (FC 2) handwheel selections, modes and other operating signals are transferred from the
operator panel front (HMI) to the NCK/PLC interface so that the modes support selection from the MCP or HMI.
Transfer of MMC signals to the interface can be deactivated by setting the value of the parameter "MMCToIF" to
"FALSE" in FB 1 (DB 7).
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 geoaxis interface of the parameterized
channel.
- When the system is switched between MCS and WCS, the active axes are generally deselected.
The handwheel selection signals from the HMI are decoded and activated in the machine-axis or the Geo-axis
interface of the handwheel selected (only if parameter "HWheelMMC := TRUE" in FB 1).
The LEDs on the machine control panel derived from the selections in the acknowledgment.
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.
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 19 or FC 24, FC 25, FC 26 are permitted in a single PLC cycle. In this case, the first call in the
cycle drives the LED displays. Furthermore, all actions of the parameterized block are carried out 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.
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