The ET 200M modular I/O station comprises:

• One IM 153 interface
• Up to 12 I/O modules of the S7-300 automation system and
• If required, one power supply.

There are no slot rules for the I/O modules. Any combination is permissible.

The ET 200M is connected via an interface module IM 153 to PROFIBUS DP or PROFINET. A connection to PROFIBUS DP using fiber-optic technology is additionally possible by means of additional optical link modules (OLM) or the optical bus terminal (OBT).

Depending on the quantity structure of the interface module (IM), different numbers and types of I/O modules can be inserted.

The full address space of the ET 200M can only be used with a suitable master.

Configuration using bus connectors

Easy assembly using SIMATIC S7-300 bus connectors makes ET 200M flexible and service-friendly:

• Module assembly;
  simply locate the modules on the mounting rail, pivot them and screw them down.
• Integral backplane bus;
  the backplane bus is integrated into the modules. The modules are connected through bus connectors that are plugged into the back of the housings.

Assembly using active bus modules

The active bus modules allow reaction-free module replacement during operation:

• Time-saving module replacement;
  operation is not interrupted on module replacement, it continues with the remaining modules. When the new module is inserted, it is automatically brought into operation again. When an S7-400 is used as a master, swapping of a distributed module is handled in the same manner as swapping of a central module. The relevant interrupt is generated in the CPU. For all other DP standard masters, a signal is sent to the master via DP diagnostics. With an S7-300 as master, hot swapping of modules is not supported.

Various modules are available for assembling the ET 200M that are mounted on a special mounting rail.

• BM PS/IM bus module to hold the power supply and IM 153
• Bus module BM IM 153/IM 153 for receiving two IM 153-2 modules for redundant operation (PROFIBUS only)
• BM 2x40 bus module to hold 2 I/O modules of 40 mm in width
• BM 1x80 bus module to hold 1 I/O module of 80 mm in width

To achieve the specified thread length, an explosion-proof partition is available as spare part; it can be inserted between two bus modules.

• Easy assembly;
  the bus modules are pivoted in the mounting rail, arranged end-to-end and fixed using side connectors. The modules can then be inserted in the bus modules and screwed down so that they contact the bus module connector. Connectors of unused slots must be protected with backplane bus covers. A bus module cover must be plugged into the side of the last bus module.

Power supply

For ET 200M, single-phase power supplies are available with 2 A, 5 A and 10 A as special variants.