Features

• Shared system technology with the other S7-300 modules, which means that they can be used together in one configuration.
• Galvanic isolation on the module.
• Protected against polarity reversal by coding.
• Sensors and actuators are supplied via the module.
• Direct wiring of the module inputs and outputs, without switch amplifier or transmitter supply units.
• Software-based rewiring is possible.
• Diagnostics-capable modules.
• Reduced planning, installation, and documentation overhead.
• Less space required in switchrooms.
• When used in the ET 200M, it can be connected to all SIMATIC automation systems and as a standard slave to all PROFIBUS DP networks
  

System configuration

Intrinsically-safe and non-intrinsically-safe circuits are galvanically isolated on the module. Sensors and actuators are supplied with power via the Ex modules.

The color of the terminal block on the Ex bus module is blue. This marking is normally prescribed in DIN VDE 0165 for intrinsically-safe circuits. Equipment thus marked must not be used for other purposes.

For example, sensors and actuators certified as intrinsically safe can be connected to the Ex input/output modules.

In addition to Ex modules, other modules can be used in a configuration. In this case, you must ensure that the LK 393 cable guide is used for wiring the Ex modules.

The following prerequisites must be satisfied when interconnecting intrinsically-safe equipment and associated equipment:

Certificates

ATEX approval

The SIMATIC S7 Ex modules have the Ex nA [ib] [ibD] IIC approval. Intrinsically-safe equipment for Zone 1/21 and Zone 2/22 may be connected. The license applies to all potentially explosive gas mixtures in Groups IIA...IIC. The safety-related limit values can be found in the certificates of conformity.

FM approval

The requirements of the FM approval FM CL.1, DIV2, GP.A, B, C, D, T4 are fulfilled.

Reference manual Ex I/O S7-300, ET 200M

The manual gives an overview of the topic "Explosion protection". It gives the reader comprehensive information on the topic of "Explosion protection". The following subjects are covered:

• Relevant standards and regulations.
• Primary and secondary explosion protection.
• Types of protection.

The manual also provides information needed for the use of the Ex I/O. Among others, the following topics are introduced:

• Construction of Ex plants.
• Installation in hazardous areas.
• Possible uses of the S7-300 Ex I/O: central (S7-300) and distributed (ET 200M to SIMATIC or as standard slave).
• Planning and configuration documentation.