The following analog and digital input and output modules are suitable for use in hazardous plants. They separate the non-intrinsically safe electrical circuits of the automation system and the intrinsically safe electrical circuits of the process. Sensors and actuators suitable for placing in zone 1 or 21 and 2 or 22 hazardous areas as well as intrinsically safe equipment compliant with DIN 50020 and [EEx ib] IIC can be operated on these modules.

All Ex modules come with diagnostics capability (channel and module diagnostics).

Ex modules identified by "redundant design possible" (6ES7 321-7RD00-0AB0, 6ES7 322-5SD00-0AB0, 6ES7 331-7RD00-0AB0, 6ES7 332-5RD00-0AB0) can also be configured redundant when used in non-hazardous plants.