Siemens SIMATIC ET 200S Manual page 90

Installation
4.1 Installation rules, installation position, rail, installation
measurements and clearances
Installation rules
• The ET 200S distributed I/O system starts with an interface module.
• There is a power module after the interface module or at the beginning of each
potential group.
• After a power module come digital, analog, process-related, or RESERVE
modules.
• The ET 200S distributed I/O system ends with the terminating module.
• The maximum configuration of the distributed I/O system is as follows:
– IM151-1 BASIC: max. 13 modules (including interface module). The length
of the bus is not relevant.
– IM151-1 STANDARD / IM151-1 FO STANDARD: max. 64 modules
(including the interface module) or a max. bus length of 2 m.
– IM151-1 HIGH FEATURE: max. 64 modules (including the interface module)
or a max. bus length of 1 m.
Installation position
The preferred installation position is horizontal on a vertical wall. Any other
installation position is also possible; however, there are limitations with regard to
ambient temperature.
DIN rail
The ET 200S distributed I/O system is installed on a zinc-plated rail to EN 50022
(35 7.5 mm or 35
Note
When the ET 200S distributed I/O device is exposed to increased vibrations and
shock, we recommend that you screw the rail to the mounting surface at intervals
of 200 mm.
To prevent the ET 200S distributed I/O system from slipping to the side, we
recommend that you fit a mechanical stop (for example, with a ground terminal,
8WA2 011-1PH20) at both ends of the device.
If you install the rail on grounded, zinc-plated mounting plates, there is no need to
ground the rail separately.
4-2
15 mm).
ET 200S Distributed I/O System
EWA-4NEB780602402-09