Siemens SIMATIC PCS 7 Manual page 12

Hardware structure
Information
1.2 Migration rack II
General
Features
1-4
For additional information on the TPM 478-2 interface modules refer to
Chapter 5 in this manual.
The migration rack II is a preassembled module rack with the dimensions of
the panel-mount system ES 902 which is required for operating a PCS7/TM
system in a TELEPERM M cabinet.
All system components such as DC power supply, CPU, FM456-4 and I/O
bus interface can be operated on the short backplane PCB.
The additional five I/O slots the migration rack II is equipped with can hold
TELEPERM M I/O modules taken from an AS 220 S-/AS 235 basic unit and
can be assigned freely to I/O bus A and B.
For the PCS7/TM system, migration rack II provides five TELEPERM M
I/O slots for the installation of TELEPERM M I/O modules taken from an
AS 220 S-/AS 235 basic unit. All slots can be operated on I/O bus A or split
up in a 3 : 2 ratio between I/O bus A and B.
Other features are the simplified wiring (supply and process control messa-
ges) and the possibility of replacing certain mechanical components (connec-
tors) in case of error.
The wiring features no loose ends, that is, installation technique is adapted to
AS 230/235.
The integrated backplane also provides distribution of specific signals and
voltages. Process control monitoring signals are now terminated on the back-
plane terminal blocks - same as in the AS 235. The existing cabinet wiring
can be used almost completely.
The front panel fuses for L+ (16A) and PM (4A) can be replaced from the
front in case of error. Due to the fastening mechanism on the side, the I/O bus
connectors can be replaced in case of error without having to remove the mi-
gration rack.
The migration rack is equipped with by-pass capacitors for the L+, PM, M24
and MZ voltages for the derivation of electrical disturbance to the shielding
and, thus to the metal case.
All position addresses of the slots are equipped with filters.
Connecting TM I/O to PCS 7
C79000-G8076-C710-04