The following SIPLUS S7-400 analog modules are available for use in extreme environmental conditions:

• SIPLUS S7-400 SM 431;
  analog inputs
• SIPLUS S7-400 SM 432;
  analog outputs

SIPLUS S7-400 analog modules are designed for use in the following environmental conditions:

• Extended ambient temperature range from -25 °C to +60 °C
• Where increased resistance to chemical, mechanical and biological loading as well as salt spray is required
• Higher installation altitudes
• In relative humidity up to 100%