Siemens SIMATIC FM 353 Manual page 28

Installing and Removing
What you should know about the mechanical layout
The FM 353 can be mounted in any of the eight available slots (slot nos.: 4...11) for
I/O modules on the mounting rail.
In configuring the mechanical layout of your controller, you should note the follow-
ing rules:
1. No more than eight SMs or FMs per tier (rack).
2. The maximum number of modules is limited by module width and by the length
of your DIN rail.
The FM 353 requires an installation width of 80 mm (3.12 inches).
3. The maximum number of modules is limited by the total power that all modules
to the left of the CPU or IM, as the case may be, consume from the 5 V back-
plane bus.
The CPU 314, for example, can supply a maximum of 1.2 A.
The FM 353 requires 100 mA of this amount.
3-2
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0