Siemens SIMATIC ET 200S - Installation rules, installation position, rail, installation measurements and clearances

Installation
4-2
ET 200S Distributed I/O System
EWA-4NEB 780602402-12
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 / IM151-3 PN:
max. 64 modules (including interface module) or max. 2 m bus length.
-- IM151-1 HIGH FEATURE: max. 64 modules (including interface module) or
max. 1 m bus length.
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.
Rail
The ET 200S distributed I/O system is installed on a zinc-plated rail to EN 50022
(35 × 7.5 mm or 35 × 15 mm).
Note
If the ET 200S distributed IO 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,
8W A2 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.