Siemens Simatic M7-400 Reference Manual page 76

Racks
Caution
!
Danger of damage to equipment.
If you insert a power supply module in a slot that is not permitted for power supply
modules, the module may be damaged. Slots 1 to 4 are permitted, whereby power
supply modules starting from slot 1 must be inserted without leaving gaps.
Make sure that power supply modules are only inserted in permitted slots. Take
particular notice of the option of swapping modules in slot 1 on subrack II and slot
9 on subrack I.
Technical Specifications of the UR2-H Rack
Number of single-width slots
Dimensions W x H x D (in mm)
Weight (in kg)
Buses
2-6
Rack
S7-400, M7-400 Programmable Controllers Module Specifications
UR2-H
2 x 9
482.5 x 290 x 27.5
3
4.1 as of version 03
Segmented I/O bus,
segmented communication bus
A5E00069467-07