Siemens ST PCS 7 User Manual

Central I/O

Siemens ST PCS 7 · November 2007

11

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Expansion units can be used for the distributed expansion of the 

SIMATIC S7-400. The IM 460-x interface modules are used as 

the interface for these expansion units.
Restrictions compared to standard I/O modules from the 

ET 200M range
• No redundant interfacing of expansion units
• No configuration during normal operation
Subracks
The universal racks (UR) are used for SIMATIC PCS 7. They can 

be used as central racks and as expansion racks. Other racks: 

see Catalog ST 70.

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Order No.

IM 460-0 interface module
• Transmitter module for central 

controller

• Without transmission of voltage 

to the expansion unit

• Cable up to 5 m long
• With K-bus for communication 

with CPs and FMs in the expan-

sion unit

• For connecting as many as 8 ex-

pansion units

Corresponding receiver module 

for the expansion unit

IM 460-1 interface module
• Transmitter module for central 

controller

• With transmission of the 5 V sup-

ply for I/O modules

• Cable up to 1.5 m long
• Without transmission of the 

K-bus, hence solely for commu-

nication from I/O modules

Corresponding receiver module 

for the expansion unit

I/O modules,
CP and FM

PS

CPU

IM 460-3 interface module
• Transmitter module for central 

controller

• Without transmission of voltage 

to the expansion unit

• Cable up to 100 m long
• With K-bus for communication 

with CPs and FMs in the expan-

sion unit

• For connecting as many as 8 ex-

pansion units

Corresponding receiver module 

for the expansion unit

for central controllers and expan-

sion units
• 18  slots
• Suitable for redundant power 

supply

for central controllers and expan-

sion units
• 9  slots
• Suitable for redundant power 

supply

for connecting IM 460-0 and 

IM 461-0; IM 460-3 and IM 461-3
• 0.75  m

• 1.5  m

• 5  m

Additional lengths for connecting 

IM 460-3 and IM 461-3
• 10  m

• 25  m

• 50  m

• 100  m

for IM 461-0

for connecting IM 460-1 and 

IM 461-1
• 0.75  m

• 1.5  m

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Order No.

© Siemens AG 2007