Siemens SINUMERIK 840D sl Function Manual page 776

Glossary
Path axis
Path axes include all machining axes of the → channel that are controlled by the →
interpolator in such a way that they start, accelerate, stop, and reach their end point
simultaneously.
Path feedrate
Path feed affects → path axes. It represents the geometric sum of the feed rates of the →
geometry axes involved.
Path velocity
The maximum programmable path velocity depends on the input resolution. For example,
with a resolution of 0.1 mm the maximum programmable path velocity is 1000 m/min.
PCIN data transfer program
PCIN is an auxiliary program for sending and receiving CNC user data (e.g. part programs,
tool offsets, etc.) via a serial interface. The PCIN program can run in MS-DOS on standard
industrial PCs.
Peripheral module
I/O modules represent the link between the CPU and the process.
I/O modules are:
• → Digital input/output modules
• → Analog input/output modules
• → Simulator modules
PLC
Programmable Logic Control: → Programmable logic controller. Component of → NC:
Programmable controller for processing the control logic of the machine tool.
PLC program memory
SINUMERIK 840D: The PLC user program, the user data and the basic PLC program are
stored together in the PLC user memory.
PLC Programming
The PLC is programmed using the STEP 7 software. The STEP 7 programming software is
based on the WINDOWS standard operating system and contains the STEP 5 programming
functions with innovative enhancements.
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Function Manual, 09/2011, 6FC5397-2BP40-2BA0
Special Functions