Structure

The module is equipped with 12 relay outputs. Each relay output is switched by two contacts in

series. After every cycle, the module reads the status of the forcibly guided contacts and

compares it status with the output variables.

The relays in use have forcibly guided contacts (EN 50205) and can be used for safety

shutdowns. Forcibly guided contacts are connected with one another mechanically such that the

normally open and the normally closed contacts cannot be closed simultaneously.

All 12 relay outputs are electrically safely isolated from one another. Each relay output is safely

isolated from the voltage supply of the module by its own contact circuit. For safe insulation, the

air and creeping distances are designed in accordance with IEC 61131-2 for overvoltage class II

up to 300 V.

For burner management systems, the switching current must be limited to 60 % of the maximum

allowed value using an external fuse in accordance with EN 298 and EN 50256 (VDE 0116).