The following SIPLUS S7-300 Ex digital modules are available for use in extreme environmental conditions:

• SIPLUS S7-300 SM321 4DI NAMUR;
  digital inputs

SIPLUS S7-300 Ex digital modules can be used in the following extreme environmental conditions:

• Extended ambient temperature range of 0 °C to +60 °C
• Where increased resistance to chemical, mechanical and biological loading as well as salt spray is required
• In relative humidity up to 100%