Siemens SINUMERIK 840Di Function Manual page 1408

Detailed Description
2.12 Block descriptions
2.12.26 FC 25: MCP_IFT transfer of MCP/OP signals to interface
Description of functions
With FC MCP_IFT (T variants), the following are transferred from the machine control panel
(MCP) to the corresponding signals of the NCK/PLC interface:
• Mode groups
• Direction keys of four axes
• WCS/MCS switchover commands
• Overrides
• Keylock 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 HMI. Transmission of HMI signals to the
interface can be deactivated by setting the FB 1 (DB 7) parameter "MMCToIF" to "FALSE".
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:
• Machine functions for INC and axis travel keys:
The handwheel selection signals from the HMI are decoded and activated in the associated
(machine) axis interface or the geo-axis interface of the handwheel selected (only if the
"HWheelMMC parameter := TRUE" in FB 1).
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.
In the case of machine control panel failure, the signals it supplies are set to zero.
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– 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.
– 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.
PLC Basic Program Solution Line (P3 sl)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0