Siemens Simatic M7-400 Reference Manual page 365

Programmable controllers module specifications
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Connection possibilities for central racks and expansion racks
Central rack CR
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
IM 460-4
IM 460-3
IM 460-1
IM 460-0
Expansion without 5 V local transfer
Expansion rack ER 1
IM 461-0
Expansion with 5 V local transfer
Expansion rack ER 1
IM 461-1
Chain length max. 1.5 m
Remote expansion
Expansion rack ER 1
IM 461-3
Expansion rack ER 1
IM 461-4
Interface Modules
Expansion rack ER 4
Chain length max. 3 m
Expansion rack ER 4
Chain length max. 102.25 m
Expansion rack ER 4
IM 461-4
Chain length max. 605 m
IM 461-0
IM 461-3
6-3

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