The slave module 'Output extension (relay, 8)' PCO2003-A1 provides 8 galvanically isolated 2-pole relay outputs with changeover switches. It extends the master modules 'Input/output module (digital, 16)' PCIO2002-A1 or the 'Output module (relay, 8)' PCO2002-A1with one slave module 'Output extension (relay, 8)' PCO2003-A1 with 8 additional 2-pole relay outputs.