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

• SIPLUS S7-300 SM 321;
  digital inputs
• SIPLUS S7-300 SM 322;
  digital outputs
• SIPLUS S7-300 SM 323;
  digital inputs and digital outputs

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

• Wide range of ambient temperatures from -25 °C to +60/+70 °C
• Where increased resistance to chemical, mechanical and biological loading as well as salt spray is required
• In relative humidity up to 100%
• Conformity with EN 50155