Siemens SINUMERIK 802D sl Function Manual page 452

Glossary
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
PLC
Programmable Logic Control Component of → NC: Programmable control for processing the
control logic of the machine tool.
PLC Programming
The PLC is programmed with STEP 7. STEP 7 is the current programming software of the
SIMATIC S7 PLC family and is the successor to STEP 5. As of Version 3.1, the user
program can be created with the PLC 802 programming tool in → ladder logic.
Polar coordinates
A coordinate system, which defines the position of a point on a plane in terms of its distance
from the origin and the angle formed by the radius vector with a defined axis.
Positioning axis
Axis that performs an auxiliary movement on a machine tool (e.g. tool magazine, pallet
transport). Positioning axes are axes that do not interpolate with → path axes.
Program block
Program blocks contain the main program and subroutines of → part programs.
Programmable frames
Programmable → frames enable dynamic definition of new coordinate system output points
while the part program is being executed. A distinction is made between absolute definition
using a new frame and additive definition with reference to an existing starting point.
Programmable Logic Control
Programmable logic controls (PLC) are electronic controls, the function of which is stored as
a program in the control unit. This means that the layout and wiring of the device do not
depend on the function of the control. The programmable logic control has the same
structure as a computer; it consists of a CPU (central module) with memory, input/output
modules and an internal bus system. The peripherals and the programming language are
matched to the requirements of the control technology.
452
Turning, Milling, Nibbling
Function Manual, 11/2012, 6FC5397-1CP10-5BA0