Siemens SINUMERIK 840C - Manual (Page 599)

09.95 8 PLC Machine Data (PLC MD)
8.2 PLC MD for the operating system (system data)
You can enable the individual bits in PLC MD 6052, and set the positive or negative edge to
be evaluated in PLC MD 6055. A rapid input is possible only when bit 0 of PLC MD 6051 is set
to "0". OB2 is invoked when bit 2 of PLC MD 6050 is "0".
No. of user interfaces command channel 33
Default value Lower input limit Upper input limit Units
0 0 8 –
DB 60
DW 33
Here you can set the number of user interfaces in DB41. You must enable the function in PLC
MD 6026, bit 1. The value 8 in MD 33 means that the user can enter a maximum of 8 job
requests in DB 41.
You should not enter a larger value than necessary, as the PLC OS scans the requests every
20 ms (affecting the runtime of the PLC program). The following functions can be initiated over
the command channel:
• S external
• Coupled motion of axes (with option 6FC5 150-0AS02-0AA0)
• Transmit (with option 6FC5 150-0AD04-0AA0)
• Division increment
• Position specification
• M19 through several revolutions
Start addresses of DMP submodules, DMP IM, lines 34 - 123
Default value Lower input limit Upper input limit Units
see table - 1 254 –
DB 60
DW 34-123
DMP = Distributed machine peripherals (byte number).
MD 34 to 123 define the start addresses of the input and outputs for each DMP submodule
interfaced. At the same time, the PLC and the DMP interface submodule check, service and
monitor the submodules.
Enter - 1 if no DMP submodule is interfaced. PLC MD 94 defaults to 64, thus interfacing the
signals from the machine control panel, beginning with input/output byte 64, to the IF PLC.
Notes:
• See the Interface Description, Part 2 for a detailed description.
• Central interrupts and DMPs generating interrupts must not be used at the same time.
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50 8–7
SINUMERIK 840C (IA)