Siemens SINUMERIK 840DE User Manual page 41

03.06
NCU box
The NCU box is the module rack of the NCU module and consists of:
S
S
S
Order number: 6FC5247-0AA00-0AA3
Fan box The fan box is absolutely required for the 573.3 (Pentium III) and 573.4 (Pen-
tium III) NCUs. Mount the fan box to the NCU box if necessary.
Order number: 6FC5247-0AA30-0AA0
PLC module
As a submodule of the NCU, the PLC module supports machine monitoring and
represents a PLC-CPU that is compatible to the S7-300 family of products. Via
the P bus, three external lines can be connected for every eight S7-300 periph-
eral modules.
Reference:
COM module
The COM module is a submodule of the NCU. It is used for communication with
187.5 kBd/1.5 MBd the PCU and peripherals.
Driver module
The driver module is a submodule of the NCU (...-...-0AEx). It forms the inter-
187.5 kBd/1.5 MBd face to the operator panel front, to the programming device, to the decentralized
peripherals and to S7-300 peripherals.
PCMCIA card
The NCU contains a plug-in unit for standard PCMCIA cards (PC card or NC
card), via which all flash cards of type II up to 8 MB storage capacity can be
operated.
The PCMCIA card serves as a bulk memory for the NC system software (NC
card).
In addition to the software upgrade, the PCMCIA card can also be used for se-
ries start-up; see
References: /IAD/ Commissioning Manual 840D
Caution
Plugging the PCMCIA card in and out while energized will cause data to be
lost!
© Siemens AG, 2006. All rights reserved
SINUMERIK 840D Configuring Manual NCU (PHD) – 03.06 Edition
NC rack assembly with cable distributor
Battery/fan slide-in module
Sheet metal housing with integrated guide bars for accommodating the
NCU and the fan/battery slide-in modules and power supply unit
Installation manual for setting up the S7-300: CPU
4 Description of the NCU
4.1 Components
4-39