Siemens SINUMERIK 840D Operator's Manual page 161

A
03.04
S
S7-300 bus
S7 configuration
Safety functions
Scaling
Services
Serial RS-232-C interface
Setting data
Simulator module
Soft Key
 Siemens AG, 2004. All rights reserved.
SINUMERIK 840D/840Di/810D Operator's Guide Handheld Terminal 6 (BAH) - 03.04 Edition
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.
S7 configuration is a tool with the aid of which modules can be
parameterized. With S7 configuration, various
-> parameter blocks of the -> CPU and the I/O modules are set on
the -> programming unit. These parameters are transmitted to the
CPU.
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
modifications.
Control operating area
For data input/output there is
• a serial RS-232-C interface on the MMC module MMC100, and on
• the MMC modules MMC101 and MMC102 two RS-232-C
interfaces
are available. Machining programs and manufacturer and user data
can be loaded and saved via these interfaces.
Data which communicate properties of the machine tool to the NC
control in a way defined by the system software.
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.
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Appendix
B Terms
A-161