P3: Basic PLC Program for SINUMERIK 840D sl
13.13 Block descriptions
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
1059
13.13.27 FC 25: MCP_IFT transfer of MCP/OP 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
• Direction keys of four axes
• WCS/MCS switchover commands
• Overrides
• Key-operated switch
In the basic program (FC 2), handwheel selections, modes and other operating signals continue to be transferred
from the operator panel front or HMI to the NCK/PLC interface so that the modes support selection from the MCP
or BT.
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).
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.
The handwheel selection signals from the MMC 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). = TRUE").
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 25 or FC 19, FC 24, 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.
Single block processing can be selected/deselected only in the first cycle.
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