Siemens SINUMERIK 840D sl Function Manual page 1054

P3: Basic PLC program for SINUMERIK 840D sl
13.17 Block descriptions
● Rapid traverse override
● Keyswitch information
Note
Mode switchover through HT 8 and/or HMI
The function FC2 "GP_HP Basic program, cyclic part" transfers the signals of the mode
switchover in such a way that an alternative selection from MCP of HT 8 and of the HMI is
possible. The transfer of the HMI signals to the NC/PLC interface can also be deactivated
in the function block FB1 with the parameter "MMCToIF" = FALSE .
Active axes
Using HT 8 a maximum of 6 axes can be addressed at the same time. The selection of the
axes is to be realized by the user/machine manufacturer in the PLC user program.
Flexible axis configuration
The function FC26 enables a flexible assignment of the machine axes to the traversing keys
or to the axis selection. 2 tables are available in DB10 for this purpose:
● Machine axis table 1. MCP: DB10.DBB8 to DBB13 (Table of the machine axis number)
Symbolic name: MCP1AxisTbl[1..22]
● Machine axis table, 2nd MCP: DB10.DBB32 to DBB37 (Table of the machine axis number)
Symbolic name: MCP2AxisTbl[1..22]
In the tables the axis numbers n (with n = 1, 2, ...) of the active machine axis are to be entered
byte-wise. The value 0 must be entered in the unused table locations.
The table length can be specified to the FC26:
● 1st MCP: DB10.DBB30 (upper limit of the machine axis table)
● 2nd MCP: DB10.DBB54 (upper limit of the machine axis table)
A value of 4, for example, means that FC26 takes into account only the first 4 table entries or
machine axes. The maximum value for the FC26 is 6. For value 0 or values greater than 6 the
maximum value is taken implicitly.
Note
Please note the following constraints:
● A check of the permissible machine axis numbers is not done. Invalid machine axis numbers
can lead to a PLC stop.
● The machine axis numbers can be changed dynamically. The table may not be written, if
currently a machine axis is being moved via a traversing key.
Transfer of the traversing key signals depending upon the active coordinate system
The traversing key signals for 6 axes lie in the HT 8 input data area below:
● EB n + 2, Bit 0 - Bit 5 (positive traversing direction)
● EB n + 3, Bit 0 - Bit 5 (negative traversing direction)
1054
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions