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Siemens SINUMERIK 840D Operator's Manual Page 340

Computerized numerical control system for machine tools.
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S7-300 bus
Safety functions
Serial RS-232-C interface
Setting data
Simulator module
The S7-300 bus is a serial databus by means of which the modules
communicate with each other and are supplied with the required
voltage. The connections between the modules are made with the ->
bus connectors.
The controls contain watchdog monitors which are always active.
These monitors detect problems in the CNC, PLC or machine in time
to prevent damage to workpiece, tool or machine as far as possible. In
the event of a malfunction the machining sequence is interrupted and
the drives are stopped, the cause of the malfunction is saved and
displayed as an alarm. At the same time, the PLC is informed that a
CNC alarm is pending.
Component of a -> frame, which causes axis-specific scale
For data input/output there is
• a serial RS-232-C interface on the MMC module MMC100, and on
• MMC modules PCU 50/70 two RS-232-C interfaces
are available. Machining programs and manufacturer and user data
can be loaded and saved via these interfaces.
Control operating area
A section of a -> parts program terminated with a line feed. A
distinction is made between -> main blocks and -> subblocks.
Data which communicate properties of the machine tool to the NC
control in a way defined by the system software.
• SINUMERIK FM-NC offers an analog +10V interface to the
SIMODRIVE 611A converter system.
• The SINUMERIK 840D control system is connected to the
SIMODRIVE 611D converter system by means of a high-speed
digital parallel bus.
A simulator module is a module
• on which digital input variables can be simulated via control
elements and
• digital output variables can be displayed.
A key whose name appears on an area of the screen. The selection of
keys displayed is adapted dynamically to the operating situation. The
freely assignable function keys (softkeys) are assigned defined
functions in the software.
SINUMERIK 840D/810D Operator's Guide HMI Embedded (BEM) – 03.04 Edition
 Siemens AG, 2004. All rights reserved


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