Siemens Simatic M7-400 Reference Manual page 74

Racks
Technical Specifications of the UR1 and UR2 Racks
Number of single-width slots
Dimensions W x H x D (in mm)
Weight (in kg)
Buses
2-4
Rack
4.1 as of version 03
S7-400, M7-400 Programmable Controllers Module Specifications
UR1
18
482.5 x 290 x 27.5 257.5 x 290 x 27.5
3
2.15 as of version 04
I/O bus and communication bus
UR2
9
1.5
A5E00069467-07